From 374e9de71934c41ce2c19c796e35a19234b240ec Mon Sep 17 00:00:00 2001
From: Haile <118998054+blackmammoth@users.noreply.github.com>
Date: Thu, 28 May 2026 11:50:41 +0300
Subject: [PATCH] feat: add opencode support (#762)

* feat: add opencode support

* fix: stabilize opencode session startup

* fix: /models

* fix: improveUI for commands

* fix: format commands.js

* feat: load models through provider adapters

Provider model selection had outgrown a single hardcoded service.

The old service mixed shared caching with provider catalogs and CLI lookup details.

That made stale model lists more likely as providers changed on separate schedules.

Move model discovery behind each provider so lookup lives next to the integration.

The shared service now focuses on provider resolution, caching, persistence, and dedupe.

Return cache metadata and add bypassCache because model availability changes outside the app.

The UI and /models command can show freshness and let users force a provider refresh.

Surface model descriptions while keeping fallback catalogs for unavailable CLIs or SDKs.

* feat(models): resolve active session models through provider adapters

The model inventory command was showing a mix of catalog defaults and
composer-local state instead of the model that is actually active for a
real provider session. That made /models, /cost, and /status
misleading once a session had already started, especially for providers
whose effective runtime model can differ from the optimistic model value
held in the UI.

Introduce an explicit getCurrentActiveModel() contract on
IProviderModels so model resolution lives next to each provider's
catalog logic and uses the provider-native source of truth:

- Claude reads the init event from a resumed stream-json run
- Codex reads model from ~/.codex/config.toml
- Cursor reads lastUsedModel from the chat store.db
- OpenCode reads the persisted session model from opencode.db
- Gemini intentionally returns its default because the CLI does not
  provide a reliable active-session lookup

Keep the returned shape intentionally minimal ({ model }). The goal is
to expose only what downstream command consumers need and avoid leaking
provider-specific metadata into a shared transport shape that would
create extra UI coupling and future cleanup cost.

Also make command behavior session-aware: when there is no concrete
session id, do not spawn provider processes or inspect provider session
storage just to answer /models, /cost, or /status. In a new-session
view the correct answer is simply the provider default, and doing more
work there adds latency and unnecessary side effects for no user value.

As part of this, centralize two supporting concerns:

- add a shared helper for building the default current-model result from
  a provider catalog so fallbacks stay aligned with DEFAULT
- move leaf-directory validation into shared utils so Cursor session
  readers and model lookup code enforce the same path-safety rule

Tests were expanded to cover both the new service delegation path and
the sessionless command behavior, while keeping cache-sensitive tests
isolated from persisted host cache state.

Why this change:
- command output should reflect the model actually driving a session
- new-session views should stay fast and side-effect free
- provider-specific active-model lookup should not be scattered across
  routes or UI code
- fallback behavior should be explicit, consistent, and limited to the
  provider default when no true active model can be resolved

* feat: support session-scoped model overrides

Model selection was acting like a provider-level preference.

That made resumed sessions drift back to a default or request-time model.

Users expect /models changes made inside a conversation to affect that session.

Store explicit session choices in app-owned ~/.cloudcli state.

This avoids editing provider transcripts or native provider config.

Resolve the effective model before launching each provider runtime.

Claude, Cursor, Codex, Gemini, and OpenCode now honor stored resume choices.

Expose a backend active-model change endpoint for existing sessions.

The models modal can now distinguish default changes from session overrides.

It also shows when a selected model will apply on the next response.

For Claude, stop probing active model state by resuming with a dummy prompt.

Read the indexed JSONL transcript from the end instead.

This preserves provider history while honoring /model stdout or model fields.

Add service tests for adapter delegation and resume-model precedence.

The tests keep cache state, override state, and requested fallback separate.

* feat: make command modal more compact

* fix: preserve opencode session creation events

OpenCode emits the real session id asynchronously on its first JSON output. The runner
registered that id from a helper that could not see the spawned process because
the process reference was scoped inside the model-resolution callback. That
ReferenceError was swallowed by the generic JSON parse fallback, so the client
never received session_created. Without that event, a new OpenCode chat stayed
on / and the assistant stream was not attached to the new session view.

Keep the process reference in the outer spawn scope so registration can update
the active-process map and websocket writer as soon as OpenCode announces the
session id. Split JSON parsing from event processing so malformed non-JSON
output can still stream as raw text, while registration or adapter failures are
surfaced as real errors instead of being hidden as assistant content.

Add a fake opencode executable regression test to lock in the expected lifecycle
ordering: session_created must be sent before live assistant messages, and the
same session id must carry through stream_end and complete.

* fix: clarify model refresh and onboarding providers

OpenCode is now a supported chat provider, but first-run onboarding still only offered
Claude, Cursor, Codex, and Gemini. That made OpenCode harder to discover and
forced users to finish setup before finding the provider in settings or chat.
Adding it to onboarding keeps first-run setup aligned with the providers the
application already supports elsewhere.

The model refresh control was also doing too much visual work. In the new chat
model picker, the previous Hard Refresh label looked like the dialog heading,
which made the primary task unclear. Users open that dialog to choose a model;
refreshing catalogs is only a secondary maintenance action for stale cached
provider model lists.

Rename and reposition the refresh affordance so the model picker reads as a
model picker first. The copy now explains why catalogs are cached, when a refresh
is useful, and that the refresh checks every provider. The /models modal gets the
same clarification so both model-selection surfaces describe the cache behavior
consistently.

* fix: format opencode model catalog labels

OpenCode returns provider-prefixed ids directly from the CLI. Passing those ids through as
labels made the model picker hard to scan: users saw values like
anthropic/claude-3-5-sonnet-20241022 or lowercased, hyphen-split text instead
of readable model names.

Keep the exact OpenCode id as the option value because that is what the CLI
expects, but derive a presentation label for the frontend. The formatter is
intentionally generic rather than a catalog of known providers. It handles common
identifier structure such as provider/model, hyphen-delimited words, v-prefixed
versions, adjacent numeric version tokens, and 8-digit date suffixes.

This keeps OpenCode usable as its model list expands across many upstream
providers without requiring code changes for every new provider or model family.
The description keeps the raw provider-prefixed id visible so users can still
confirm the precise model being selected.

* feat: add more fallback models for cursor

* docs: move model catalog out of shared

The model catalog is no longer a frontend/backend runtime contract.

Keeping it under shared made ownership misleading. It implied the catalog was
application code shared by runtime consumers, even though it now only supports
README links and public API documentation.

Move the catalog into public so it lives beside the docs surfaces that need it.
This gives the API docs a stable, served module and gives README readers a
linkable source without suggesting frontend or backend runtime dependency.

Render the API docs model list from the exported provider registry instead of a
hardcoded Claude/Cursor/Codex subset. That keeps Gemini and OpenCode visible and
makes future provider documentation changes flow through one docs-specific file.

Update README links, provider maintenance notes, and package files so published
artifacts include the standalone docs page and model catalog without relying on
the old shared path.

* fix: simplify empty-state model selector

Keep the provider empty state focused on the setup action users need there:

choosing a model.

The refresh control, cache timestamp, and refresh explanation made the dialog feel

like a cache-management surface.

That extra action is out of place in the empty state, where the goal is to start

a chat with the selected provider and model.

Remove the refresh-specific UI from ProviderSelectionEmptyState and drop the

now-unused refresh/cache props from the ChatMessagesPane pass-through.

Refresh behavior remains available in the dedicated command result flow.
---
 README.de.md                                  |   2 +-
 README.ko.md                                  |   2 +-
 README.md                                     |   2 +-
 README.ru.md                                  |   2 +-
 README.tr.md                                  |   2 +-
 README.zh-CN.md                               |   2 +-
 package.json                                  |   2 +
 public/api-docs.html                          |  13 +-
 public/modelConstants.js                      | 841 ++++++++++++++++++
 redirect-package/README.md                    |   2 +-
 server/claude-sdk.js                          |  16 +-
 server/cursor-cli.js                          |   9 +-
 server/gemini-cli.js                          |   8 +-
 server/index.js                               |  22 +
 server/modules/database/index.ts              |   1 +
 .../services/project-management.service.ts    |   2 +
 .../projects-with-sessions-fetch.service.ts   |   8 +-
 server/modules/providers/README.md            |  14 +-
 .../list/claude/claude-models.provider.ts     | 230 +++++
 .../providers/list/claude/claude.provider.ts  |   3 +
 .../list/codex/codex-models.provider.ts       | 125 +++
 .../list/codex/codex-skills.provider.ts       |  60 +-
 .../providers/list/codex/codex.provider.ts    |   3 +
 .../list/cursor/cursor-models.provider.ts     | 283 ++++++
 .../list/cursor/cursor-sessions.provider.ts   |  27 +-
 .../providers/list/cursor/cursor.provider.ts  |   3 +
 .../list/gemini/gemini-models.provider.ts     |  42 +
 .../providers/list/gemini/gemini.provider.ts  |   3 +
 .../list/opencode/opencode-auth.provider.ts   | 111 +++
 .../list/opencode/opencode-mcp.provider.ts    | 228 +++++
 .../list/opencode/opencode-models.provider.ts | 339 +++++++
 .../opencode-session-synchronizer.provider.ts | 157 ++++
 .../opencode/opencode-sessions.provider.ts    | 463 ++++++++++
 .../list/opencode/opencode-skills.provider.ts |  78 ++
 .../list/opencode/opencode.provider.ts        |  27 +
 server/modules/providers/provider.registry.ts |   2 +
 server/modules/providers/provider.routes.ts   |  64 +-
 .../services/provider-models.service.ts       | 325 +++++++
 .../services/session-synchronizer.service.ts  |   1 +
 .../services/sessions-watcher.service.ts      |   8 +
 .../shared/base/abstract.provider.ts          |   2 +
 server/modules/providers/tests/mcp.test.ts    |  92 +-
 .../providers/tests/opencode-models.test.ts   |  73 ++
 .../providers/tests/opencode-sessions.test.ts | 321 +++++++
 .../tests/provider-models.service.test.ts     | 318 +++++++
 server/modules/providers/tests/skills.test.ts |  66 ++
 .../services/chat-websocket.service.ts        |  16 +-
 .../services/shell-websocket.service.ts       |   9 +
 server/openai-codex.js                        |   9 +-
 server/opencode-cli.js                        | 263 ++++++
 server/opencode-cli.test.js                   |  95 ++
 server/routes/agent.js                        |  30 +-
 server/routes/commands.js                     | 449 +++++-----
 server/routes/cursor.js                       |   4 +-
 server/routes/tests/commands.test.js          |  82 ++
 server/shared/interfaces.ts                   |  45 +
 server/shared/types.ts                        |  89 +-
 server/shared/utils.ts                        | 384 ++++++++
 shared/modelConstants.js                      | 107 ---
 .../chat/hooks/useChatComposerState.ts        | 202 +++--
 .../chat/hooks/useChatProviderState.ts        | 279 +++++-
 .../chat/hooks/useChatRealtimeHandlers.ts     |  53 +-
 .../chat/hooks/useChatSessionState.ts         |  14 +-
 src/components/chat/view/ChatInterface.tsx    |  40 +-
 .../view/subcomponents/ChatMessagesPane.tsx   |  21 +-
 .../chat/view/subcomponents/ClaudeStatus.tsx  |   3 +-
 .../view/subcomponents/CommandResultModal.tsx | 731 +++++++++++++++
 .../view/subcomponents/MessageComponent.tsx   |  14 +-
 .../ProviderSelectionEmptyState.tsx           |  96 +-
 .../sources/useSessionsSource.ts              |   2 +
 .../llm-logo-provider/OpenCodeLogo.tsx        |  25 +
 .../llm-logo-provider/SessionProviderLogo.tsx |   5 +
 src/components/mcp/constants.ts               |   5 +
 .../subcomponents/AgentConnectionsStep.tsx    |   8 +
 src/components/provider-auth/types.ts         |   4 +-
 .../provider-auth/view/ProviderLoginModal.tsx |   5 +
 .../settings/constants/constants.ts           |   2 +-
 .../tabs/agents-settings/AgentListItem.tsx    |  11 +-
 .../agents-settings/AgentsSettingsTab.tsx     |   7 +-
 .../sections/AgentSelectorSection.tsx         |   4 +-
 .../sections/content/AccountContent.tsx       |  15 +-
 src/components/sidebar/types/types.ts         |   1 +
 src/components/sidebar/utils/utils.ts         |   8 +-
 src/hooks/useProjectsState.ts                 |  30 +-
 src/i18n/locales/en/chat.json                 |   4 +-
 src/i18n/locales/en/settings.json             |   6 +-
 src/types/app.ts                              |  20 +-
 87 files changed, 7024 insertions(+), 577 deletions(-)
 create mode 100644 public/modelConstants.js
 create mode 100644 server/modules/providers/list/claude/claude-models.provider.ts
 create mode 100644 server/modules/providers/list/codex/codex-models.provider.ts
 create mode 100644 server/modules/providers/list/cursor/cursor-models.provider.ts
 create mode 100644 server/modules/providers/list/gemini/gemini-models.provider.ts
 create mode 100644 server/modules/providers/list/opencode/opencode-auth.provider.ts
 create mode 100644 server/modules/providers/list/opencode/opencode-mcp.provider.ts
 create mode 100644 server/modules/providers/list/opencode/opencode-models.provider.ts
 create mode 100644 server/modules/providers/list/opencode/opencode-session-synchronizer.provider.ts
 create mode 100644 server/modules/providers/list/opencode/opencode-sessions.provider.ts
 create mode 100644 server/modules/providers/list/opencode/opencode-skills.provider.ts
 create mode 100644 server/modules/providers/list/opencode/opencode.provider.ts
 create mode 100644 server/modules/providers/services/provider-models.service.ts
 create mode 100644 server/modules/providers/tests/opencode-models.test.ts
 create mode 100644 server/modules/providers/tests/opencode-sessions.test.ts
 create mode 100644 server/modules/providers/tests/provider-models.service.test.ts
 create mode 100644 server/opencode-cli.js
 create mode 100644 server/opencode-cli.test.js
 create mode 100644 server/routes/tests/commands.test.js
 delete mode 100644 shared/modelConstants.js
 create mode 100644 src/components/chat/view/subcomponents/CommandResultModal.tsx
 create mode 100644 src/components/llm-logo-provider/OpenCodeLogo.tsx

diff --git a/README.de.md b/README.de.md
index c98af089..9f8a429b 100644
--- a/README.de.md
+++ b/README.de.md
@@ -62,7 +62,7 @@
 - **Sitzungsverwaltung** – Gespräche fortsetzen, mehrere Sitzungen verwalten und Verlauf nachverfolgen
 - **Plugin-System** – CloudCLI mit eigenen Plugins erweitern – neue Tabs, Backend-Dienste und Integrationen hinzufügen. [Eigenes Plugin erstellen →](https://github.com/cloudcli-ai/cloudcli-plugin-starter)
 - **TaskMaster AI Integration** *(Optional)* – Erweitertes Projektmanagement mit KI-gestützter Aufgabenplanung, PRD-Parsing und Workflow-Automatisierung
-- **Modell-Kompatibilität** – Funktioniert mit Claude, GPT und Gemini (vollständige Liste unterstützter Modelle in [`shared/modelConstants.js`](shared/modelConstants.js))
+- **Modell-Kompatibilität** – Funktioniert mit Claude, GPT und Gemini (vollständige Liste unterstützter Modelle in [`public/modelConstants.js`](public/modelConstants.js))
 
 
 ## Schnellstart
diff --git a/README.ko.md b/README.ko.md
index b5cf5a98..41e142bf 100644
--- a/README.ko.md
+++ b/README.ko.md
@@ -60,7 +60,7 @@
 - **세션 관리** - 대화를 재개하고, 여러 세션을 관리하며 기록을 추적
 - **플러그인 시스템** - 커스텀 탭, 백엔드 서비스, 통합을 추가하여 CloudCLI 확장. [직접 빌드 →](https://github.com/cloudcli-ai/cloudcli-plugin-starter)
 - **TaskMaster AI 통합** *(선택사항)* - AI 중심의 작업 계획, PRD 파싱, 워크플로 자동화를 통한 고급 프로젝트 관리
-- **모델 호환성** - Claude, GPT, Gemini 모델 계열에서 작동 (`shared/modelConstants.js`에서 전체 지원 모델 확인)
+- **모델 호환성** - Claude, GPT, Gemini 모델 계열에서 작동 (`public/modelConstants.js`에서 전체 지원 모델 확인)
 
 ## 빠른 시작
 
diff --git a/README.md b/README.md
index ae95b030..bb60c9e0 100644
--- a/README.md
+++ b/README.md
@@ -62,7 +62,7 @@
 - **Session Management** - Resume conversations, manage multiple sessions, and track history
 - **Plugin System** - Extend CloudCLI with custom plugins — add new tabs, backend services, and integrations. [Build your own →](https://github.com/cloudcli-ai/cloudcli-plugin-starter)
 - **TaskMaster AI Integration** *(Optional)* - Advanced project management with AI-powered task planning, PRD parsing, and workflow automation
-- **Model Compatibility** - Works with Claude, GPT, and Gemini model families (see [`shared/modelConstants.js`](shared/modelConstants.js) for the full list of supported models)
+- **Model Compatibility** - Works with Claude, GPT, and Gemini model families (see [`public/modelConstants.js`](public/modelConstants.js) for the full list of supported models)
 
 
 ## Quick Start
diff --git a/README.ru.md b/README.ru.md
index c197676a..97d8074f 100644
--- a/README.ru.md
+++ b/README.ru.md
@@ -62,7 +62,7 @@
 - **Управление сессиями** - возобновляйте диалоги, управляйте несколькими сессиями и отслеживайте историю
 - **Система плагинов** - расширяйте CloudCLI кастомными плагинами — добавляйте новые вкладки, бэкенд-сервисы и интеграции. [Создать свой →](https://github.com/cloudcli-ai/cloudcli-plugin-starter)
 - **Интеграция с TaskMaster AI** *(опционально)* - продвинутое управление проектами с планированием задач на базе AI, разбором PRD и автоматизацией workflow
-- **Совместимость с моделями** - работает с семействами моделей Claude, GPT и Gemini (см. [`shared/modelConstants.js`](shared/modelConstants.js) для полного списка поддерживаемых моделей)
+- **Совместимость с моделями** - работает с семействами моделей Claude, GPT и Gemini (см. [`public/modelConstants.js`](public/modelConstants.js) для полного списка поддерживаемых моделей)
 
 
 ## Быстрый старт
diff --git a/README.tr.md b/README.tr.md
index a0bcdf58..c84770e5 100644
--- a/README.tr.md
+++ b/README.tr.md
@@ -62,7 +62,7 @@
 - **Oturum Yönetimi** — Konuşmalara devam et, birden fazla oturumu yönet ve geçmişi takip et
 - **Eklenti Sistemi** — CloudCLI'ı özel eklentilerle genişlet: yeni sekmeler, arka uç servisleri ve entegrasyonlar ekle. [Kendi eklentini yaz →](https://github.com/cloudcli-ai/cloudcli-plugin-starter)
 - **TaskMaster AI Entegrasyonu** *(İsteğe Bağlı)* — AI destekli görev planlama, PRD ayrıştırma ve iş akışı otomasyonu ile gelişmiş proje yönetimi
-- **Model Uyumluluğu** — Claude, GPT ve Gemini model aileleriyle çalışır (desteklenen tüm modeller için [`shared/modelConstants.js`](shared/modelConstants.js) dosyasına bak)
+- **Model Uyumluluğu** — Claude, GPT ve Gemini model aileleriyle çalışır (desteklenen tüm modeller için [`public/modelConstants.js`](public/modelConstants.js) dosyasına bak)
 
 
 ## Hızlı Başlangıç
diff --git a/README.zh-CN.md b/README.zh-CN.md
index 3e6ced3f..2ee656e8 100644
--- a/README.zh-CN.md
+++ b/README.zh-CN.md
@@ -60,7 +60,7 @@
 - **会话管理** - 恢复对话、管理多个会话并跟踪历史记录
 - **插件系统** - 通过自定义选项卡、后端服务与集成扩展 CloudCLI。 [开始构建 →](https://github.com/cloudcli-ai/cloudcli-plugin-starter)
 - **TaskMaster AI 集成** *(可选)* - 结合 AI 任务规划、PRD 分析与工作流自动化，实现高级项目管理
-- **模型兼容性** - 支持 Claude、GPT、Gemini 模型家族（完整支持列表见 [`shared/modelConstants.js`](shared/modelConstants.js)）
+- **模型兼容性** - 支持 Claude、GPT、Gemini 模型家族（完整支持列表见 [`public/modelConstants.js`](public/modelConstants.js)）
 
 ## 快速开始
 
diff --git a/package.json b/package.json
index 8f7bd266..626d0e3b 100644
--- a/package.json
+++ b/package.json
@@ -10,6 +10,8 @@
   "files": [
     "server/",
     "shared/",
+    "public/api-docs.html",
+    "public/modelConstants.js",
     "dist/",
     "dist-server/",
     "scripts/",
diff --git a/public/api-docs.html b/public/api-docs.html
index 1d86cf4c..0103b5ca 100644
--- a/public/api-docs.html
+++ b/public/api-docs.html
@@ -822,7 +822,7 @@ data: {"type":"done"}</code></pre>
 
     <script type="module">
         // Import model constants
-        import { CLAUDE_MODELS, CURSOR_MODELS, CODEX_MODELS } from '/shared/modelConstants.js';
+        import { PROVIDERS } from './modelConstants.js';
 
         // Dynamic URL replacement
         const apiUrl = window.location.origin;
@@ -834,15 +834,14 @@ data: {"type":"done"}</code></pre>
         window.addEventListener('DOMContentLoaded', () => {
             const modelCell = document.getElementById('model-options-cell');
             if (modelCell) {
-                const claudeModels = CLAUDE_MODELS.OPTIONS.map(m => `<code>${m.value}</code>`).join(', ');
-                const cursorModels = CURSOR_MODELS.OPTIONS.slice(0, 8).map(m => `<code>${m.value}</code>`).join(', ');
-                const codexModels = CODEX_MODELS.OPTIONS.map(m => `<code>${m.value}</code>`).join(', ');
+                const providerModels = PROVIDERS.map(provider => {
+                    const models = provider.models.OPTIONS.map(m => `<code>${m.value}</code>`).join(', ');
+                    return `<strong>${provider.name}:</strong> ${models} (default: <code>${provider.models.DEFAULT}</code>)`;
+                }).join('<br><br>');
 
                 modelCell.innerHTML = `
                     Model identifier for the AI provider:<br><br>
-                    <strong>Claude:</strong> ${claudeModels} (default: <code>${CLAUDE_MODELS.DEFAULT}</code>)<br><br>
-                    <strong>Cursor:</strong> ${cursorModels}, and more (default: <code>${CURSOR_MODELS.DEFAULT}</code>)<br><br>
-                    <strong>Codex:</strong> ${codexModels} (default: <code>${CODEX_MODELS.DEFAULT}</code>)
+                    ${providerModels}
                 `;
             }
         });
diff --git a/public/modelConstants.js b/public/modelConstants.js
new file mode 100644
index 00000000..35e653aa
--- /dev/null
+++ b/public/modelConstants.js
@@ -0,0 +1,841 @@
+/**
+ * Documentation Model Definitions
+ * Used by README links and the public API docs.
+ */
+
+/**
+ * Claude (Anthropic) Models
+ */
+export const CLAUDE_MODELS = {
+  OPTIONS: [
+    {
+      value: "default",
+      label: "Default (recommended)",
+      description: "Use the default model (currently Opus 4.7 (1M context)) · $5/$25 per Mtok",
+    },
+    {
+      value: "sonnet",
+      label: "Sonnet",
+      description: "Sonnet 4.6 · Best for everyday tasks · $3/$15 per Mtok",
+    },
+    {
+      value: "sonnet[1m]",
+      label: "Sonnet (1M context)",
+      description: "Sonnet 4.6 for long sessions · $3/$15 per Mtok",
+    },
+    {
+      value: "haiku",
+      label: "Haiku",
+      description: "Haiku 4.5 · Fastest for quick answers · $1/$5 per Mtok",
+    },
+  ],
+
+  DEFAULT: "default",
+};
+
+/**
+ * Cursor Models
+ */
+export const CURSOR_MODELS = {
+  OPTIONS: [
+    { value: "auto", label: "auto", description: "Auto" },
+    {
+      value: "composer-2-fast",
+      label: "composer-2-fast",
+      description: "Composer 2 Fast",
+    },
+    {
+      value: "composer-2",
+      label: "composer-2",
+      description: "Composer 2",
+    },
+    {
+      value: "gpt-5.3-codex-low",
+      label: "gpt-5.3-codex-low",
+      description: "Codex 5.3 Low",
+    },
+    {
+      value: "gpt-5.3-codex-low-fast",
+      label: "gpt-5.3-codex-low-fast",
+      description: "Codex 5.3 Low Fast",
+    },
+    {
+      value: "gpt-5.3-codex",
+      label: "gpt-5.3-codex",
+      description: "Codex 5.3",
+    },
+    {
+      value: "gpt-5.3-codex-fast",
+      label: "gpt-5.3-codex-fast",
+      description: "Codex 5.3 Fast",
+    },
+    {
+      value: "gpt-5.3-codex-high",
+      label: "gpt-5.3-codex-high",
+      description: "Codex 5.3 High",
+    },
+    {
+      value: "gpt-5.3-codex-high-fast",
+      label: "gpt-5.3-codex-high-fast",
+      description: "Codex 5.3 High Fast",
+    },
+    {
+      value: "gpt-5.3-codex-xhigh",
+      label: "gpt-5.3-codex-xhigh",
+      description: "Codex 5.3 Extra High",
+    },
+    {
+      value: "gpt-5.3-codex-xhigh-fast",
+      label: "gpt-5.3-codex-xhigh-fast",
+      description: "Codex 5.3 Extra High Fast",
+    },
+    { value: "gpt-5.2", label: "gpt-5.2", description: "GPT-5.2" },
+    {
+      value: "gpt-5.2-codex-low",
+      label: "gpt-5.2-codex-low",
+      description: "Codex 5.2 Low",
+    },
+    {
+      value: "gpt-5.2-codex-low-fast",
+      label: "gpt-5.2-codex-low-fast",
+      description: "Codex 5.2 Low Fast",
+    },
+    {
+      value: "gpt-5.2-codex",
+      label: "gpt-5.2-codex",
+      description: "Codex 5.2",
+    },
+    {
+      value: "gpt-5.2-codex-fast",
+      label: "gpt-5.2-codex-fast",
+      description: "Codex 5.2 Fast",
+    },
+    {
+      value: "gpt-5.2-codex-high",
+      label: "gpt-5.2-codex-high",
+      description: "Codex 5.2 High",
+    },
+    {
+      value: "gpt-5.2-codex-high-fast",
+      label: "gpt-5.2-codex-high-fast",
+      description: "Codex 5.2 High Fast",
+    },
+    {
+      value: "gpt-5.2-codex-xhigh",
+      label: "gpt-5.2-codex-xhigh",
+      description: "Codex 5.2 Extra High",
+    },
+    {
+      value: "gpt-5.2-codex-xhigh-fast",
+      label: "gpt-5.2-codex-xhigh-fast",
+      description: "Codex 5.2 Extra High Fast",
+    },
+    {
+      value: "gpt-5.1-codex-max-low",
+      label: "gpt-5.1-codex-max-low",
+      description: "Codex 5.1 Max Low",
+    },
+    {
+      value: "gpt-5.1-codex-max-low-fast",
+      label: "gpt-5.1-codex-max-low-fast",
+      description: "Codex 5.1 Max Low Fast",
+    },
+    {
+      value: "gpt-5.1-codex-max-medium",
+      label: "gpt-5.1-codex-max-medium",
+      description: "Codex 5.1 Max",
+    },
+    {
+      value: "gpt-5.1-codex-max-medium-fast",
+      label: "gpt-5.1-codex-max-medium-fast",
+      description: "Codex 5.1 Max Medium Fast",
+    },
+    {
+      value: "gpt-5.1-codex-max-high",
+      label: "gpt-5.1-codex-max-high",
+      description: "Codex 5.1 Max High",
+    },
+    {
+      value: "gpt-5.1-codex-max-high-fast",
+      label: "gpt-5.1-codex-max-high-fast",
+      description: "Codex 5.1 Max High Fast",
+    },
+    {
+      value: "gpt-5.1-codex-max-xhigh",
+      label: "gpt-5.1-codex-max-xhigh",
+      description: "Codex 5.1 Max Extra High",
+    },
+    {
+      value: "gpt-5.1-codex-max-xhigh-fast",
+      label: "gpt-5.1-codex-max-xhigh-fast",
+      description: "Codex 5.1 Max Extra High Fast",
+    },
+    {
+      value: "composer-2.5",
+      label: "composer-2.5",
+      description: "Composer 2.5",
+    },
+    {
+      value: "gpt-5.5-high",
+      label: "gpt-5.5-high",
+      description: "GPT-5.5 1M High",
+    },
+    {
+      value: "gpt-5.5-high-fast",
+      label: "gpt-5.5-high-fast",
+      description: "GPT-5.5 High Fast",
+    },
+    {
+      value: "claude-opus-4-7-thinking-high",
+      label: "claude-opus-4-7-thinking-high",
+      description: "Opus 4.7 1M High Thinking",
+    },
+    {
+      value: "gpt-5.4-high",
+      label: "gpt-5.4-high",
+      description: "GPT-5.4 1M High",
+    },
+    {
+      value: "gpt-5.4-high-fast",
+      label: "gpt-5.4-high-fast",
+      description: "GPT-5.4 High Fast",
+    },
+    {
+      value: "claude-4.6-opus-high-thinking",
+      label: "claude-4.6-opus-high-thinking",
+      description: "Opus 4.6 1M Thinking",
+    },
+    {
+      value: "claude-4.6-opus-high-thinking-fast",
+      label: "claude-4.6-opus-high-thinking-fast",
+      description: "Opus 4.6 1M Thinking Fast",
+    },
+    {
+      value: "composer-2.5-fast",
+      label: "composer-2.5-fast",
+      description: "Composer 2.5 Fast",
+    },
+    {
+      value: "gpt-5.5-none",
+      label: "gpt-5.5-none",
+      description: "GPT-5.5 1M None",
+    },
+    {
+      value: "gpt-5.5-none-fast",
+      label: "gpt-5.5-none-fast",
+      description: "GPT-5.5 None Fast",
+    },
+    {
+      value: "gpt-5.5-low",
+      label: "gpt-5.5-low",
+      description: "GPT-5.5 1M Low",
+    },
+    {
+      value: "gpt-5.5-low-fast",
+      label: "gpt-5.5-low-fast",
+      description: "GPT-5.5 Low Fast",
+    },
+    {
+      value: "gpt-5.5-medium",
+      label: "gpt-5.5-medium",
+      description: "GPT-5.5 1M",
+    },
+    {
+      value: "gpt-5.5-medium-fast",
+      label: "gpt-5.5-medium-fast",
+      description: "GPT-5.5 Fast",
+    },
+    {
+      value: "gpt-5.5-extra-high",
+      label: "gpt-5.5-extra-high",
+      description: "GPT-5.5 1M Extra High",
+    },
+    {
+      value: "gpt-5.5-extra-high-fast",
+      label: "gpt-5.5-extra-high-fast",
+      description: "GPT-5.5 Extra High Fast",
+    },
+    {
+      value: "claude-4.6-sonnet-medium",
+      label: "claude-4.6-sonnet-medium",
+      description: "Sonnet 4.6 1M",
+    },
+    {
+      value: "claude-4.6-sonnet-medium-thinking",
+      label: "claude-4.6-sonnet-medium-thinking",
+      description: "Sonnet 4.6 1M Thinking",
+    },
+    {
+      value: "claude-opus-4-7-low",
+      label: "claude-opus-4-7-low",
+      description: "Opus 4.7 1M Low",
+    },
+    {
+      value: "claude-opus-4-7-low-fast",
+      label: "claude-opus-4-7-low-fast",
+      description: "Opus 4.7 1M Low Fast",
+    },
+    {
+      value: "claude-opus-4-7-medium",
+      label: "claude-opus-4-7-medium",
+      description: "Opus 4.7 1M Medium",
+    },
+    {
+      value: "claude-opus-4-7-medium-fast",
+      label: "claude-opus-4-7-medium-fast",
+      description: "Opus 4.7 1M Medium Fast",
+    },
+    {
+      value: "claude-opus-4-7-high",
+      label: "claude-opus-4-7-high",
+      description: "Opus 4.7 1M High",
+    },
+    {
+      value: "claude-opus-4-7-high-fast",
+      label: "claude-opus-4-7-high-fast",
+      description: "Opus 4.7 1M High Fast",
+    },
+    {
+      value: "claude-opus-4-7-xhigh",
+      label: "claude-opus-4-7-xhigh",
+      description: "Opus 4.7 1M",
+    },
+    {
+      value: "claude-opus-4-7-xhigh-fast",
+      label: "claude-opus-4-7-xhigh-fast",
+      description: "Opus 4.7 1M Fast",
+    },
+    {
+      value: "claude-opus-4-7-max",
+      label: "claude-opus-4-7-max",
+      description: "Opus 4.7 1M Max",
+    },
+    {
+      value: "claude-opus-4-7-max-fast",
+      label: "claude-opus-4-7-max-fast",
+      description: "Opus 4.7 1M Max Fast",
+    },
+    {
+      value: "claude-opus-4-7-thinking-low",
+      label: "claude-opus-4-7-thinking-low",
+      description: "Opus 4.7 1M Low Thinking",
+    },
+    {
+      value: "claude-opus-4-7-thinking-low-fast",
+      label: "claude-opus-4-7-thinking-low-fast",
+      description: "Opus 4.7 1M Low Thinking Fast",
+    },
+    {
+      value: "claude-opus-4-7-thinking-medium",
+      label: "claude-opus-4-7-thinking-medium",
+      description: "Opus 4.7 1M Medium Thinking",
+    },
+    {
+      value: "claude-opus-4-7-thinking-medium-fast",
+      label: "claude-opus-4-7-thinking-medium-fast",
+      description: "Opus 4.7 1M Medium Thinking Fast",
+    },
+    {
+      value: "claude-opus-4-7-thinking-high-fast",
+      label: "claude-opus-4-7-thinking-high-fast",
+      description: "Opus 4.7 1M High Thinking Fast",
+    },
+    {
+      value: "claude-opus-4-7-thinking-xhigh",
+      label: "claude-opus-4-7-thinking-xhigh",
+      description: "Opus 4.7 1M Thinking",
+    },
+    {
+      value: "claude-opus-4-7-thinking-xhigh-fast",
+      label: "claude-opus-4-7-thinking-xhigh-fast",
+      description: "Opus 4.7 1M Thinking Fast",
+    },
+    {
+      value: "claude-opus-4-7-thinking-max",
+      label: "claude-opus-4-7-thinking-max",
+      description: "Opus 4.7 1M Max Thinking",
+    },
+    {
+      value: "claude-opus-4-7-thinking-max-fast",
+      label: "claude-opus-4-7-thinking-max-fast",
+      description: "Opus 4.7 1M Max Thinking Fast",
+    },
+    {
+      value: "grok-build-0.1",
+      label: "grok-build-0.1",
+      description: "Grok Build 0.1 1M",
+    },
+    {
+      value: "gpt-5.4-low",
+      label: "gpt-5.4-low",
+      description: "GPT-5.4 1M Low",
+    },
+    {
+      value: "gpt-5.4-medium",
+      label: "gpt-5.4-medium",
+      description: "GPT-5.4 1M",
+    },
+    {
+      value: "gpt-5.4-medium-fast",
+      label: "gpt-5.4-medium-fast",
+      description: "GPT-5.4 Fast",
+    },
+    {
+      value: "gpt-5.4-xhigh",
+      label: "gpt-5.4-xhigh",
+      description: "GPT-5.4 1M Extra High",
+    },
+    {
+      value: "gpt-5.4-xhigh-fast",
+      label: "gpt-5.4-xhigh-fast",
+      description: "GPT-5.4 Extra High Fast",
+    },
+    {
+      value: "claude-4.6-opus-high",
+      label: "claude-4.6-opus-high",
+      description: "Opus 4.6 1M",
+    },
+    {
+      value: "claude-4.6-opus-max",
+      label: "claude-4.6-opus-max",
+      description: "Opus 4.6 1M Max",
+    },
+    {
+      value: "claude-4.6-opus-max-thinking",
+      label: "claude-4.6-opus-max-thinking",
+      description: "Opus 4.6 1M Max Thinking",
+    },
+    {
+      value: "claude-4.6-opus-max-thinking-fast",
+      label: "claude-4.6-opus-max-thinking-fast",
+      description: "Opus 4.6 1M Max Thinking Fast",
+    },
+    {
+      value: "claude-4.5-opus-high",
+      label: "claude-4.5-opus-high",
+      description: "Opus 4.5",
+    },
+    {
+      value: "claude-4.5-opus-high-thinking",
+      label: "claude-4.5-opus-high-thinking",
+      description: "Opus 4.5 Thinking",
+    },
+    {
+      value: "gpt-5.2-low",
+      label: "gpt-5.2-low",
+      description: "GPT-5.2 Low",
+    },
+    {
+      value: "gpt-5.2-low-fast",
+      label: "gpt-5.2-low-fast",
+      description: "GPT-5.2 Low Fast",
+    },
+    {
+      value: "gpt-5.2-fast",
+      label: "gpt-5.2-fast",
+      description: "GPT-5.2 Fast",
+    },
+    {
+      value: "gpt-5.2-high",
+      label: "gpt-5.2-high",
+      description: "GPT-5.2 High",
+    },
+    {
+      value: "gpt-5.2-high-fast",
+      label: "gpt-5.2-high-fast",
+      description: "GPT-5.2 High Fast",
+    },
+    {
+      value: "gpt-5.2-xhigh",
+      label: "gpt-5.2-xhigh",
+      description: "GPT-5.2 Extra High",
+    },
+    {
+      value: "gpt-5.2-xhigh-fast",
+      label: "gpt-5.2-xhigh-fast",
+      description: "GPT-5.2 Extra High Fast",
+    },
+    {
+      value: "gemini-3.1-pro",
+      label: "gemini-3.1-pro",
+      description: "Gemini 3.1 Pro",
+    },
+    {
+      value: "gpt-5.4-mini-none",
+      label: "gpt-5.4-mini-none",
+      description: "GPT-5.4 Mini None",
+    },
+    {
+      value: "gpt-5.4-mini-low",
+      label: "gpt-5.4-mini-low",
+      description: "GPT-5.4 Mini Low",
+    },
+    {
+      value: "gpt-5.4-mini-medium",
+      label: "gpt-5.4-mini-medium",
+      description: "GPT-5.4 Mini",
+    },
+    {
+      value: "gpt-5.4-mini-high",
+      label: "gpt-5.4-mini-high",
+      description: "GPT-5.4 Mini High",
+    },
+    {
+      value: "gpt-5.4-mini-xhigh",
+      label: "gpt-5.4-mini-xhigh",
+      description: "GPT-5.4 Mini Extra High",
+    },
+    {
+      value: "gpt-5.4-nano-none",
+      label: "gpt-5.4-nano-none",
+      description: "GPT-5.4 Nano None",
+    },
+    {
+      value: "gpt-5.4-nano-low",
+      label: "gpt-5.4-nano-low",
+      description: "GPT-5.4 Nano Low",
+    },
+    {
+      value: "gpt-5.4-nano-medium",
+      label: "gpt-5.4-nano-medium",
+      description: "GPT-5.4 Nano",
+    },
+    {
+      value: "gpt-5.4-nano-high",
+      label: "gpt-5.4-nano-high",
+      description: "GPT-5.4 Nano High",
+    },
+    {
+      value: "gpt-5.4-nano-xhigh",
+      label: "gpt-5.4-nano-xhigh",
+      description: "GPT-5.4 Nano Extra High",
+    },
+    {
+      value: "grok-4.3",
+      label: "grok-4.3",
+      description: "Grok 4.3 1M",
+    },
+    {
+      value: "claude-4.5-sonnet",
+      label: "claude-4.5-sonnet",
+      description: "Sonnet 4.5",
+    },
+    {
+      value: "claude-4.5-sonnet-thinking",
+      label: "claude-4.5-sonnet-thinking",
+      description: "Sonnet 4.5 Thinking",
+    },
+    {
+      value: "gpt-5.1-low",
+      label: "gpt-5.1-low",
+      description: "GPT-5.1 Low",
+    },
+    {
+      value: "gpt-5.1",
+      label: "gpt-5.1",
+      description: "GPT-5.1",
+    },
+    {
+      value: "gpt-5.1-high",
+      label: "gpt-5.1-high",
+      description: "GPT-5.1 High",
+    },
+    {
+      value: "gemini-3-flash",
+      label: "gemini-3-flash",
+      description: "Gemini 3 Flash",
+    },
+    {
+      value: "gemini-3.5-flash",
+      label: "gemini-3.5-flash",
+      description: "Gemini 3.5 Flash",
+    },
+    {
+      value: "gpt-5.1-codex-mini-low",
+      label: "gpt-5.1-codex-mini-low",
+      description: "Codex 5.1 Mini Low",
+    },
+    {
+      value: "gpt-5.1-codex-mini",
+      label: "gpt-5.1-codex-mini",
+      description: "Codex 5.1 Mini",
+    },
+    {
+      value: "gpt-5.1-codex-mini-high",
+      label: "gpt-5.1-codex-mini-high",
+      description: "Codex 5.1 Mini High",
+    },
+    {
+      value: "claude-4-sonnet",
+      label: "claude-4-sonnet",
+      description: "Sonnet 4",
+    },
+    {
+      value: "claude-4-sonnet-thinking",
+      label: "claude-4-sonnet-thinking",
+      description: "Sonnet 4 Thinking",
+    },
+    {
+      value: "gpt-5-mini",
+      label: "gpt-5-mini",
+      description: "GPT-5 Mini",
+    },
+    {
+      value: "kimi-k2.5",
+      label: "kimi-k2.5",
+      description: "Kimi K2.5",
+    },
+  ],
+
+  DEFAULT: "composer-2.5-fast",
+};
+
+/**
+ * Codex (OpenAI) Models
+ */
+export const CODEX_MODELS = {
+  OPTIONS: [
+    { value: "gpt-5.5", label: "gpt-5.5" },
+    { value: "gpt-5.4", label: "gpt-5.4" },
+    { value: "gpt-5.4-mini", label: "gpt-5.4-mini" },
+    { value: "gpt-5.3-codex", label: "gpt-5.3-codex" },
+    { value: "gpt-5.2", label: "gpt-5.2" },
+  ],
+
+  DEFAULT: "gpt-5.4",
+};
+
+/**
+ * Gemini Models
+ */
+export const GEMINI_MODELS = {
+  OPTIONS: [
+    { value: "gemini-3.1-pro-preview", label: "Gemini 3.1 Pro Preview" },
+    { value: "gemini-3-pro-preview", label: "Gemini 3 Pro Preview" },
+    { value: "gemini-3-flash-preview", label: "Gemini 3 Flash Preview" },
+    { value: "gemini-2.5-flash", label: "Gemini 2.5 Flash" },
+    { value: "gemini-2.5-pro", label: "Gemini 2.5 Pro" },
+    { value: "gemini-2.0-flash-lite", label: "Gemini 2.0 Flash Lite" },
+    { value: "gemini-2.0-flash", label: "Gemini 2.0 Flash" },
+    { value: "gemini-2.0-pro-exp", label: "Gemini 2.0 Pro Experimental" },
+    {
+      value: "gemini-2.0-flash-thinking-exp",
+      label: "Gemini 2.0 Flash Thinking",
+    },
+  ],
+
+  DEFAULT: "gemini-3.1-pro-preview",
+};
+
+/**
+ * OpenCode Models
+ *
+ * OpenCode model ids include the upstream provider prefix.
+ */
+export const OPENCODE_MODELS = {
+  OPTIONS: [
+    {
+      value: "opencode/big-pickle",
+      label: "Big Pickle",
+      description: "opencode - opencode/big-pickle",
+    },
+    {
+      value: "opencode/deepseek-v4-flash-free",
+      label: "Deepseek V4 Flash Free",
+      description: "opencode - opencode/deepseek-v4-flash-free",
+    },
+    {
+      value: "opencode/nemotron-3-super-free",
+      label: "Nemotron 3 Super Free",
+      description: "opencode - opencode/nemotron-3-super-free",
+    },
+    {
+      value: "anthropic/claude-3-5-haiku-20241022",
+      label: "Claude 3.5 Haiku (2024-10-22)",
+      description: "anthropic - anthropic/claude-3-5-haiku-20241022",
+    },
+    {
+      value: "anthropic/claude-3-5-haiku-latest",
+      label: "Claude 3.5 Haiku Latest",
+      description: "anthropic - anthropic/claude-3-5-haiku-latest",
+    },
+    {
+      value: "anthropic/claude-3-5-sonnet-20240620",
+      label: "Claude 3.5 Sonnet (2024-06-20)",
+      description: "anthropic - anthropic/claude-3-5-sonnet-20240620",
+    },
+    {
+      value: "anthropic/claude-3-5-sonnet-20241022",
+      label: "Claude 3.5 Sonnet (2024-10-22)",
+      description: "anthropic - anthropic/claude-3-5-sonnet-20241022",
+    },
+    {
+      value: "anthropic/claude-3-7-sonnet-20250219",
+      label: "Claude 3.7 Sonnet (2025-02-19)",
+      description: "anthropic - anthropic/claude-3-7-sonnet-20250219",
+    },
+    {
+      value: "anthropic/claude-3-haiku-20240307",
+      label: "Claude 3 Haiku (2024-03-07)",
+      description: "anthropic - anthropic/claude-3-haiku-20240307",
+    },
+    {
+      value: "anthropic/claude-3-opus-20240229",
+      label: "Claude 3 Opus (2024-02-29)",
+      description: "anthropic - anthropic/claude-3-opus-20240229",
+    },
+    {
+      value: "anthropic/claude-3-sonnet-20240229",
+      label: "Claude 3 Sonnet (2024-02-29)",
+      description: "anthropic - anthropic/claude-3-sonnet-20240229",
+    },
+    {
+      value: "anthropic/claude-haiku-4-5",
+      label: "Claude Haiku 4.5",
+      description: "anthropic - anthropic/claude-haiku-4-5",
+    },
+    {
+      value: "anthropic/claude-haiku-4-5-20251001",
+      label: "Claude Haiku 4.5 (2025-10-01)",
+      description: "anthropic - anthropic/claude-haiku-4-5-20251001",
+    },
+    {
+      value: "anthropic/claude-opus-4-0",
+      label: "Claude Opus 4.0",
+      description: "anthropic - anthropic/claude-opus-4-0",
+    },
+    {
+      value: "anthropic/claude-opus-4-1",
+      label: "Claude Opus 4.1",
+      description: "anthropic - anthropic/claude-opus-4-1",
+    },
+    {
+      value: "anthropic/claude-opus-4-1-20250805",
+      label: "Claude Opus 4.1 (2025-08-05)",
+      description: "anthropic - anthropic/claude-opus-4-1-20250805",
+    },
+    {
+      value: "anthropic/claude-opus-4-20250514",
+      label: "Claude Opus 4 (2025-05-14)",
+      description: "anthropic - anthropic/claude-opus-4-20250514",
+    },
+    {
+      value: "anthropic/claude-opus-4-5",
+      label: "Claude Opus 4.5",
+      description: "anthropic - anthropic/claude-opus-4-5",
+    },
+    {
+      value: "anthropic/claude-opus-4-5-20251101",
+      label: "Claude Opus 4.5 (2025-11-01)",
+      description: "anthropic - anthropic/claude-opus-4-5-20251101",
+    },
+    {
+      value: "anthropic/claude-opus-4-6",
+      label: "Claude Opus 4.6",
+      description: "anthropic - anthropic/claude-opus-4-6",
+    },
+    {
+      value: "anthropic/claude-opus-4-6-fast",
+      label: "Claude Opus 4.6 Fast",
+      description: "anthropic - anthropic/claude-opus-4-6-fast",
+    },
+    {
+      value: "anthropic/claude-opus-4-7",
+      label: "Claude Opus 4.7",
+      description: "anthropic - anthropic/claude-opus-4-7",
+    },
+    {
+      value: "anthropic/claude-opus-4-7-fast",
+      label: "Claude Opus 4.7 Fast",
+      description: "anthropic - anthropic/claude-opus-4-7-fast",
+    },
+    {
+      value: "anthropic/claude-sonnet-4-0",
+      label: "Claude Sonnet 4.0",
+      description: "anthropic - anthropic/claude-sonnet-4-0",
+    },
+    {
+      value: "anthropic/claude-sonnet-4-20250514",
+      label: "Claude Sonnet 4 (2025-05-14)",
+      description: "anthropic - anthropic/claude-sonnet-4-20250514",
+    },
+    {
+      value: "anthropic/claude-sonnet-4-5",
+      label: "Claude Sonnet 4.5",
+      description: "anthropic - anthropic/claude-sonnet-4-5",
+    },
+    {
+      value: "anthropic/claude-sonnet-4-5-20250929",
+      label: "Claude Sonnet 4.5 (2025-09-29)",
+      description: "anthropic - anthropic/claude-sonnet-4-5-20250929",
+    },
+    {
+      value: "anthropic/claude-sonnet-4-6",
+      label: "Claude Sonnet 4.6",
+      description: "anthropic - anthropic/claude-sonnet-4-6",
+    },
+    {
+      value: "openai/gpt-5.2",
+      label: "GPT-5.2",
+      description: "openai - openai/gpt-5.2",
+    },
+    {
+      value: "openai/gpt-5.3-codex",
+      label: "GPT-5.3 Codex",
+      description: "openai - openai/gpt-5.3-codex",
+    },
+    {
+      value: "openai/gpt-5.3-codex-spark",
+      label: "GPT-5.3 Codex Spark",
+      description: "openai - openai/gpt-5.3-codex-spark",
+    },
+    {
+      value: "openai/gpt-5.4",
+      label: "GPT-5.4",
+      description: "openai - openai/gpt-5.4",
+    },
+    {
+      value: "openai/gpt-5.4-fast",
+      label: "GPT-5.4 Fast",
+      description: "openai - openai/gpt-5.4-fast",
+    },
+    {
+      value: "openai/gpt-5.4-mini",
+      label: "GPT-5.4 Mini",
+      description: "openai - openai/gpt-5.4-mini",
+    },
+    {
+      value: "openai/gpt-5.4-mini-fast",
+      label: "GPT-5.4 Mini Fast",
+      description: "openai - openai/gpt-5.4-mini-fast",
+    },
+    {
+      value: "openai/gpt-5.5",
+      label: "GPT-5.5",
+      description: "openai - openai/gpt-5.5",
+    },
+    {
+      value: "openai/gpt-5.5-fast",
+      label: "GPT-5.5 Fast",
+      description: "openai - openai/gpt-5.5-fast",
+    },
+    {
+      value: "openai/gpt-5.5-pro",
+      label: "GPT-5.5 Pro",
+      description: "openai - openai/gpt-5.5-pro",
+    },
+  ],
+
+  DEFAULT: "anthropic/claude-sonnet-4-5",
+};
+
+/**
+ * Ordered provider registry. Display order in documentation.
+ */
+export const PROVIDERS = [
+  { id: "claude", name: "Anthropic", models: CLAUDE_MODELS },
+  { id: "codex", name: "OpenAI", models: CODEX_MODELS },
+  { id: "gemini", name: "Google", models: GEMINI_MODELS },
+  { id: "cursor", name: "Cursor", models: CURSOR_MODELS },
+  { id: "opencode", name: "OpenCode", models: OPENCODE_MODELS },
+];
diff --git a/redirect-package/README.md b/redirect-package/README.md
index 2cc6cdda..6dd6c618 100644
--- a/redirect-package/README.md
+++ b/redirect-package/README.md
@@ -75,7 +75,7 @@
 - **Session Management** - Resume conversations, manage multiple sessions, and track history
 - **Plugin System** - Extend CloudCLI with custom plugins — add new tabs, backend services, and integrations. [Build your own →](https://github.com/cloudcli-ai/cloudcli-plugin-starter)
 - **TaskMaster AI Integration** *(Optional)* - Advanced project management with AI-powered task planning, PRD parsing, and workflow automation
-- **Model Compatibility** - Works with Claude, GPT, and Gemini model families (see [`shared/modelConstants.js`](https://github.com/siteboon/claudecodeui/blob/main/shared/modelConstants.js) for the full list of supported models)
+- **Model Compatibility** - Works with Claude, GPT, and Gemini model families (see [`public/modelConstants.js`](https://github.com/siteboon/claudecodeui/blob/main/public/modelConstants.js) for the full list of supported models)
 
 
 ## Quick Start
diff --git a/server/claude-sdk.js b/server/claude-sdk.js
index 0f1cac97..da15142d 100644
--- a/server/claude-sdk.js
+++ b/server/claude-sdk.js
@@ -17,7 +17,8 @@ import crypto from 'crypto';
 import { promises as fs } from 'fs';
 import path from 'path';
 import os from 'os';
-import { CLAUDE_MODELS } from '../shared/modelConstants.js';
+import { CLAUDE_FALLBACK_MODELS } from './modules/providers/list/claude/claude-models.provider.js';
+import { providerModelsService } from './modules/providers/services/provider-models.service.js';
 import { resolveClaudeCodeExecutablePath } from './shared/claude-cli-path.js';
 import {
   createNotificationEvent,
@@ -204,7 +205,7 @@ function mapCliOptionsToSDK(options = {}) {
 
   // Map model (default to sonnet)
   // Valid models: sonnet, opus, haiku, opusplan, sonnet[1m]
-  sdkOptions.model = options.model || CLAUDE_MODELS.DEFAULT;
+  sdkOptions.model = options.model || CLAUDE_FALLBACK_MODELS.DEFAULT;
   // Model logged at query start below
 
   // Map system prompt configuration
@@ -491,8 +492,17 @@ async function queryClaudeSDK(command, options = {}, ws) {
   };
 
   try {
+    const resolvedModel = await providerModelsService.resolveResumeModel(
+      'claude',
+      sessionId,
+      options.model,
+    );
+
     // Map CLI options to SDK format
-    const sdkOptions = mapCliOptionsToSDK(options);
+    const sdkOptions = mapCliOptionsToSDK({
+      ...options,
+      model: resolvedModel || options.model,
+    });
 
     // Load MCP configuration
     const mcpServers = await loadMcpConfig(options.cwd);
diff --git a/server/cursor-cli.js b/server/cursor-cli.js
index 1d5a7d79..6cfd7bac 100644
--- a/server/cursor-cli.js
+++ b/server/cursor-cli.js
@@ -3,6 +3,7 @@ import crossSpawn from 'cross-spawn';
 import { notifyRunFailed, notifyRunStopped } from './services/notification-orchestrator.js';
 import { sessionsService } from './modules/providers/services/sessions.service.js';
 import { providerAuthService } from './modules/providers/services/provider-auth.service.js';
+import { providerModelsService } from './modules/providers/services/provider-models.service.js';
 import { createNormalizedMessage } from './shared/utils.js';
 
 // Use cross-spawn on Windows for better command execution
@@ -28,6 +29,7 @@ function isWorkspaceTrustPrompt(text = '') {
 async function spawnCursor(command, options = {}, ws) {
   return new Promise(async (resolve, reject) => {
     const { sessionId, projectPath, cwd, resume, toolsSettings, skipPermissions, model, sessionSummary } = options;
+    const resolvedModel = await providerModelsService.resolveResumeModel('cursor', sessionId, model);
     let capturedSessionId = sessionId; // Track session ID throughout the process
     let sessionCreatedSent = false; // Track if we've already sent session-created event
     let hasRetriedWithTrust = false;
@@ -52,9 +54,10 @@ async function spawnCursor(command, options = {}, ws) {
       // Provide a prompt (works for both new and resumed sessions)
       baseArgs.push('-p', command);
 
-      // Add model flag if specified (only meaningful for new sessions; harmless on resume)
-      if (!sessionId && model) {
-        baseArgs.push('--model', model);
+      // Model overrides are applied to both new and resumed sessions so a
+      // session-scoped change request can take effect on the next turn.
+      if (resolvedModel) {
+        baseArgs.push('--model', resolvedModel);
       }
 
       // Request streaming JSON when we are providing a prompt
diff --git a/server/gemini-cli.js b/server/gemini-cli.js
index 1f45682c..ee1fd845 100644
--- a/server/gemini-cli.js
+++ b/server/gemini-cli.js
@@ -9,6 +9,7 @@ import sessionManager from './sessionManager.js';
 import GeminiResponseHandler from './gemini-response-handler.js';
 import { notifyRunFailed, notifyRunStopped } from './services/notification-orchestrator.js';
 import { providerAuthService } from './modules/providers/services/provider-auth.service.js';
+import { providerModelsService } from './modules/providers/services/provider-models.service.js';
 import { createNormalizedMessage } from './shared/utils.js';
 
 // Use cross-spawn on Windows for correct .cmd resolution (same pattern as cursor-cli.js)
@@ -120,6 +121,11 @@ async function buildGeminiProcessEnv() {
 
 async function spawnGemini(command, options = {}, ws) {
     const { sessionId, projectPath, cwd, toolsSettings, permissionMode, images, sessionSummary } = options;
+    const resolvedModel = await providerModelsService.resolveResumeModel(
+        'gemini',
+        sessionId,
+        options.model
+    );
     let capturedSessionId = sessionId; // Track session ID throughout the process
     let sessionCreatedSent = false; // Track if we've already sent session-created event
     let assistantBlocks = []; // Accumulate the full response blocks including tools
@@ -244,7 +250,7 @@ async function spawnGemini(command, options = {}, ws) {
     }
 
     // Add model for all sessions (both new and resumed)
-    let modelToUse = options.model || 'gemini-2.5-flash';
+    let modelToUse = resolvedModel || 'gemini-2.5-flash';
     args.push('--model', modelToUse);
     args.push('--output-format', 'stream-json');
 
diff --git a/server/index.js b/server/index.js
index d8223e2a..8ef49461 100755
--- a/server/index.js
+++ b/server/index.js
@@ -45,6 +45,12 @@ import {
     isGeminiSessionActive,
     getActiveGeminiSessions,
 } from './gemini-cli.js';
+import {
+    spawnOpenCode,
+    abortOpenCodeSession,
+    isOpenCodeSessionActive,
+    getActiveOpenCodeSessions,
+} from './opencode-cli.js';
 import sessionManager from './sessionManager.js';
 import {
     stripAnsiSequences,
@@ -94,21 +100,25 @@ const wss = createWebSocketServer(server, {
         spawnCursor,
         queryCodex,
         spawnGemini,
+        spawnOpenCode,
         abortClaudeSDKSession,
         abortCursorSession,
         abortCodexSession,
         abortGeminiSession,
+        abortOpenCodeSession,
         resolveToolApproval,
         isClaudeSDKSessionActive,
         isCursorSessionActive,
         isCodexSessionActive,
         isGeminiSessionActive,
+        isOpenCodeSessionActive,
         reconnectSessionWriter,
         getPendingApprovalsForSession,
         getActiveClaudeSDKSessions,
         getActiveCursorSessions,
         getActiveCodexSessions,
         getActiveGeminiSessions,
+        getActiveOpenCodeSessions,
     },
     shell: {
         getSessionById: (sessionId) => sessionManager.getSession(sessionId),
@@ -1148,6 +1158,18 @@ app.get('/api/projects/:projectId/sessions/:sessionId/token-usage', authenticate
             });
         }
 
+        // OpenCode token totals are surfaced through provider history reads.
+        // This legacy endpoint only knows file-backed session formats.
+        if (provider === 'opencode') {
+            return res.json({
+                used: 0,
+                total: 0,
+                breakdown: { input: 0, cacheCreation: 0, cacheRead: 0 },
+                unsupported: true,
+                message: 'Token usage tracking is available in OpenCode session history, not this legacy endpoint'
+            });
+        }
+
         // Handle Codex sessions
         if (provider === 'codex') {
             const codexSessionsDir = path.join(homeDir, '.codex', 'sessions');
diff --git a/server/modules/database/index.ts b/server/modules/database/index.ts
index 787521ed..da87740c 100644
--- a/server/modules/database/index.ts
+++ b/server/modules/database/index.ts
@@ -1,4 +1,5 @@
 export { initializeDatabase } from '@/modules/database/init-db.js';
+export { closeConnection, getConnection, getDatabasePath } from '@/modules/database/connection.js';
 export { apiKeysDb } from '@/modules/database/repositories/api-keys.js';
 export { appConfigDb } from '@/modules/database/repositories/app-config.js';
 export { credentialsDb } from '@/modules/database/repositories/credentials.js';
diff --git a/server/modules/projects/services/project-management.service.ts b/server/modules/projects/services/project-management.service.ts
index 9dbe857e..674418cc 100644
--- a/server/modules/projects/services/project-management.service.ts
+++ b/server/modules/projects/services/project-management.service.ts
@@ -33,6 +33,7 @@ type ProjectApiView = {
   cursorSessions: [];
   codexSessions: [];
   geminiSessions: [];
+  opencodeSessions: [];
   sessionMeta: {
     hasMore: false;
     total: 0;
@@ -84,6 +85,7 @@ function mapProjectRowToApiView(projectRow: ProjectRepositoryRow): ProjectApiVie
     cursorSessions: [],
     codexSessions: [],
     geminiSessions: [],
+    opencodeSessions: [],
     sessionMeta: {
       hasMore: false,
       total: 0,
diff --git a/server/modules/projects/services/projects-with-sessions-fetch.service.ts b/server/modules/projects/services/projects-with-sessions-fetch.service.ts
index 55a5d6d8..bb252f69 100644
--- a/server/modules/projects/services/projects-with-sessions-fetch.service.ts
+++ b/server/modules/projects/services/projects-with-sessions-fetch.service.ts
@@ -14,7 +14,7 @@ type SessionSummary = {
   lastActivity: string;
 };
 
-type SessionsByProvider = Record<'claude' | 'cursor' | 'codex' | 'gemini', SessionSummary[]>;
+type SessionsByProvider = Record<'claude' | 'cursor' | 'codex' | 'gemini' | 'opencode', SessionSummary[]>;
 
 type SessionRepositoryRow = {
   provider: string;
@@ -34,6 +34,7 @@ export type ProjectListItem = {
   cursorSessions: SessionSummary[];
   codexSessions: SessionSummary[];
   geminiSessions: SessionSummary[];
+  opencodeSessions: SessionSummary[];
   sessionMeta: {
     hasMore: boolean;
     total: number;
@@ -74,6 +75,7 @@ export type ProjectSessionsPageApiView = {
   cursorSessions: SessionSummary[];
   codexSessions: SessionSummary[];
   geminiSessions: SessionSummary[];
+  opencodeSessions: SessionSummary[];
   sessionMeta: {
     hasMore: boolean;
     total: number;
@@ -139,6 +141,7 @@ function bucketSessionRowsByProvider(rows: SessionRepositoryRow[]): SessionsByPr
     cursor: [],
     codex: [],
     gemini: [],
+    opencode: [],
   };
 
   for (const row of rows) {
@@ -253,6 +256,7 @@ export async function getProjectsWithSessions(
       cursorSessions: sessionsPage.sessionsByProvider.cursor,
       codexSessions: sessionsPage.sessionsByProvider.codex,
       geminiSessions: sessionsPage.sessionsByProvider.gemini,
+      opencodeSessions: sessionsPage.sessionsByProvider.opencode,
       sessionMeta: {
         hasMore: sessionsPage.hasMore,
         total: sessionsPage.total,
@@ -309,6 +313,7 @@ export async function getArchivedProjectsWithSessions(
       cursorSessions: sessionsPage.sessionsByProvider.cursor,
       codexSessions: sessionsPage.sessionsByProvider.codex,
       geminiSessions: sessionsPage.sessionsByProvider.gemini,
+      opencodeSessions: sessionsPage.sessionsByProvider.opencode,
       sessionMeta: {
         hasMore: sessionsPage.hasMore,
         total: sessionsPage.total,
@@ -341,6 +346,7 @@ export async function getProjectSessionsPage(
     cursorSessions: sessionsPage.sessionsByProvider.cursor,
     codexSessions: sessionsPage.sessionsByProvider.codex,
     geminiSessions: sessionsPage.sessionsByProvider.gemini,
+    opencodeSessions: sessionsPage.sessionsByProvider.opencode,
     sessionMeta: {
       hasMore: sessionsPage.hasMore,
       total: sessionsPage.total,
diff --git a/server/modules/providers/README.md b/server/modules/providers/README.md
index c0d3fcb4..6812fb3e 100644
--- a/server/modules/providers/README.md
+++ b/server/modules/providers/README.md
@@ -37,6 +37,7 @@ Current provider ids in this repo are:
 - `codex`
 - `cursor`
 - `gemini`
+- `opencode`
 
 Those ids are mirrored in backend unions and frontend provider constants. If
 adding a new provider, update every place that hardcodes this list.
@@ -55,7 +56,8 @@ server/modules/providers/list/<provider>/
   <provider>-session-synchronizer.provider.ts
 ```
 
-The existing provider folders are `claude`, `codex`, `cursor`, and `gemini`.
+The existing provider folders are `claude`, `codex`, `cursor`, `gemini`, and
+`opencode`.
 
 ## What Each Facet Does
 
@@ -81,7 +83,7 @@ The existing provider folders are `claude`, `codex`, `cursor`, and `gemini`.
 - Update `server/modules/providers/provider.routes.ts`.
 - Update `server/routes/agent.js` if the provider is launchable from the agent runtime.
 - Update `server/index.js` if the provider needs runtime boot or shutdown wiring.
-- Update `shared/modelConstants.js` if the provider appears in UI provider pickers.
+- Update `public/modelConstants.js` if the provider appears in README or public API docs.
 - Update `src/components/chat/hooks/useChatProviderState.ts` and
   `src/components/chat/view/subcomponents/ProviderSelectionEmptyState.tsx` if
   the provider should be selectable in chat.
@@ -122,6 +124,7 @@ Current MCP formats in this repo are:
 | Codex | `.codex/config.toml` | `user`, `project` | `stdio`, `http` |
 | Cursor | `.cursor/mcp.json` | `user`, `project` | `stdio`, `http` |
 | Gemini | `.gemini/settings.json` | `user`, `project` | `stdio`, `http` |
+| OpenCode | `~/.config/opencode/opencode.json` or `<workspace>/opencode.json` (`.jsonc` is read when present) | `user`, `project` | `stdio`, `http` |
 
 5. Implement skills.
 
@@ -142,6 +145,7 @@ Current skill discovery roots are:
 | Codex | `~/.agents/skills`, `~/.codex/skills/.system`, `/etc/codex/skills` | `<workspace>/.agents/skills`, `path.dirname(workspacePath)/.agents/skills`, topmost git root `.agents/skills` | `$` | Overlapping roots are deduplicated before scanning. |
 | Cursor | `~/.cursor/skills` | `<workspace>/.cursor/skills`, `<workspace>/.agents/skills` | `/` | Uses slash-style commands. |
 | Gemini | `~/.gemini/skills`, `~/.agents/skills` | `<workspace>/.gemini/skills`, `<workspace>/.agents/skills` | `/` | Uses slash-style commands. |
+| OpenCode | `~/.config/opencode/skills`, `~/.claude/skills`, `~/.agents/skills` | Cwd-to-topmost-git-root `.opencode/skills`, `.claude/skills`, and `.agents/skills` | `/` | Reuses OpenCode, Claude, and Agents skill locations. Overlapping roots are deduplicated before scanning. |
 
 Command forms currently used by the providers are:
 
@@ -150,6 +154,7 @@ Command forms currently used by the providers are:
 - Codex skills: `$skill-name`
 - Cursor skills: `/skill-name`
 - Gemini skills: `/skill-name`
+- OpenCode skills: `/skill-name`
 
 6. Implement sessions.
 
@@ -187,6 +192,7 @@ Current session sync roots are:
 | Codex | `~/.codex/sessions/**/*.jsonl` | Uses `~/.codex/session_index.jsonl` for title lookup and the last `task_complete` message for a fallback title. |
 | Cursor | `~/.cursor/projects/**/*.jsonl` | Uses sibling `worker.log` to recover `workspacePath`, then derives the session title from the first user prompt. |
 | Gemini | `~/.gemini/tmp/**/*.jsonl` | Current full scans only index temp JSONL chat artifacts. Single-file sync also accepts legacy `.json` files. |
+| OpenCode | `~/.local/share/opencode/opencode.db` | Reads active sessions/messages/parts from OpenCode's shared SQLite database and stores `jsonl_path` as `null` so deleting one app session cannot remove the shared DB. |
 
 8. Register the provider.
 
@@ -203,10 +209,11 @@ If the provider can run live chat sessions, update the runtime entrypoints too:
 
 If the provider is visible in the UI, update:
 
-- `shared/modelConstants.js`
+- provider model fallback files under `server/modules/providers/list/<provider>/`
 - `src/components/chat/hooks/useChatProviderState.ts`
 - `src/components/chat/view/subcomponents/ProviderSelectionEmptyState.tsx`
 - `src/components/provider-auth/view/ProviderLoginModal.tsx`
+- `src/components/mcp/constants.ts`
 
 ## Minimal Wrapper Template
 
@@ -324,6 +331,7 @@ Useful tests in this repo:
 
 - `server/modules/providers/tests/mcp.test.ts`
 - `server/modules/providers/tests/skills.test.ts`
+- `server/modules/providers/tests/opencode-sessions.test.ts`
 
 If you touch sessions or session synchronization, add or update focused tests
 alongside the implementation.
diff --git a/server/modules/providers/list/claude/claude-models.provider.ts b/server/modules/providers/list/claude/claude-models.provider.ts
new file mode 100644
index 00000000..02e04194
--- /dev/null
+++ b/server/modules/providers/list/claude/claude-models.provider.ts
@@ -0,0 +1,230 @@
+import { readFile } from 'node:fs/promises';
+
+import { query, type ModelInfo, type Options } from '@anthropic-ai/claude-agent-sdk';
+
+import { sessionsDb } from '@/modules/database/index.js';
+import { resolveClaudeCodeExecutablePath } from '@/shared/claude-cli-path.js';
+import type { IProviderModels } from '@/shared/interfaces.js';
+import type {
+  ProviderChangeActiveModelInput,
+  ProviderCurrentActiveModel,
+  ProviderModelOption,
+  ProviderModelsDefinition,
+  ProviderSessionActiveModelChange,
+} from '@/shared/types.js';
+import {
+  buildDefaultProviderCurrentActiveModel,
+  writeProviderSessionActiveModelChange,
+} from '@/shared/utils.js';
+
+export const CLAUDE_FALLBACK_MODELS: ProviderModelsDefinition = {
+  OPTIONS: [
+    { value: 'default', label: 'Default (recommended)' },
+    { value: 'sonnet[1m]', label: 'Sonnet (1M context)' },
+    { value: 'opus', label: 'Opus' },
+    { value: 'opus[1m]', label: 'Opus (1M context)' },
+    { value: 'haiku', label: 'Haiku' },
+    { value: 'sonnet', label: 'sonnet' },
+  ],
+  DEFAULT: 'default',
+};
+
+type ClaudeModelQueryOptions = Pick<Options, 'env' | 'pathToClaudeCodeExecutable' | 'permissionMode'>;
+type ClaudeInitEvent = {
+  sessionId?: string;
+  session_id?: string;
+  type?: string;
+  subtype?: string;
+  model?: string;
+  message?: {
+    content?: unknown;
+    model?: string;
+  };
+};
+
+const ANSI_PATTERN = new RegExp(
+  '[\\u001B\\u009B][[\\]()#;?]*(?:'
+  + '(?:[0-9]{1,4}(?:;[0-9]{0,4})*)?[0-9A-ORZcf-nqry=><]'
+  + '|(?:[\\dA-PR-TZcf-ntqry=><~]))',
+  'g',
+);
+
+const buildClaudeQueryOptions = (): ClaudeModelQueryOptions => ({
+  env: { ...process.env },
+  pathToClaudeCodeExecutable: resolveClaudeCodeExecutablePath(process.env.CLAUDE_CLI_PATH),
+  permissionMode: 'default',
+});
+
+const mapClaudeModel = (model: ModelInfo): ProviderModelOption => ({
+  value: model.value,
+  label: model.displayName || model.value,
+  description: model.description || undefined,
+});
+
+const buildClaudeModelsDefinition = (models: ModelInfo[]): ProviderModelsDefinition => {
+  const options: ProviderModelOption[] = [];
+  const seenValues = new Set<string>();
+
+  for (const model of models) {
+    const mappedModel = mapClaudeModel(model);
+    if (seenValues.has(mappedModel.value)) {
+      continue;
+    }
+
+    seenValues.add(mappedModel.value);
+    options.push(mappedModel);
+  }
+
+  if (options.length === 0) {
+    return CLAUDE_FALLBACK_MODELS;
+  }
+
+  const defaultValue = options.find((option) => option.value === 'default')?.value
+    ?? options[0]?.value
+    ?? CLAUDE_FALLBACK_MODELS.DEFAULT;
+
+  return {
+    OPTIONS: options,
+    DEFAULT: defaultValue,
+  };
+};
+
+const extractClaudeEventModel = (event: ClaudeInitEvent, sessionId: string): string | null => {
+  const eventSessionId = event.sessionId ?? event.session_id;
+  if (eventSessionId && eventSessionId !== sessionId) {
+    return null;
+  }
+
+  const contentModel = extractClaudeModelFromMessageContent(event.message?.content);
+  if (contentModel) {
+    return contentModel;
+  }
+
+  const directModel = event.model?.trim();
+  if (directModel) {
+    return directModel;
+  }
+
+  const messageModel = event.message?.model?.trim();
+  return messageModel || null;
+};
+
+const stripAnsi = (value: string): string => value.replace(ANSI_PATTERN, '');
+
+const extractTaggedContent = (content: string, tagName: string): string | null => {
+  const escapedTagName = tagName.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
+  const match = new RegExp(`<${escapedTagName}>([\\s\\S]*?)<\\/${escapedTagName}>`).exec(content);
+  return match ? match[1] : null;
+};
+
+const extractClaudeModelFromTextContent = (content: string): string | null => {
+  const localCommandStdout = extractTaggedContent(content, 'local-command-stdout');
+  if (localCommandStdout !== null) {
+    const cleanedStdout = stripAnsi(localCommandStdout).replace(/\s+/g, ' ').trim();
+    const changedModel = /(?:set|changed|switched)\s+model\s+to\s+(.+?)\.?$/i.exec(cleanedStdout);
+    if (changedModel?.[1]?.trim()) {
+      return changedModel[1].trim();
+    }
+  }
+
+  const modelTag = extractTaggedContent(content, 'model')?.trim();
+  return modelTag || null;
+};
+
+const extractClaudeModelFromMessageContent = (content: unknown): string | null => {
+  if (typeof content === 'string') {
+    return extractClaudeModelFromTextContent(content);
+  }
+
+  if (!Array.isArray(content)) {
+    return null;
+  }
+
+  for (const part of content) {
+    if (!part || typeof part !== 'object' || !('text' in part) || typeof part.text !== 'string') {
+      continue;
+    }
+
+    const model = extractClaudeModelFromTextContent(part.text);
+    if (model) {
+      return model;
+    }
+  }
+
+  return null;
+};
+
+const readClaudeSessionModelFromJsonl = async (
+  sessionId: string,
+  jsonlPath: string,
+): Promise<ProviderCurrentActiveModel | null> => {
+  const content = await readFile(jsonlPath, 'utf8');
+  const lines = content
+    .split(/\r?\n/)
+    .map((line) => line.trim())
+    .filter(Boolean);
+
+  for (let index = lines.length - 1; index >= 0; index -= 1) {
+    try {
+      const event = JSON.parse(lines[index]) as ClaudeInitEvent;
+      const model = extractClaudeEventModel(event, sessionId);
+      if (model) {
+        return { model };
+      }
+    } catch {
+      // Skip malformed JSONL lines that can happen during concurrent writes.
+    }
+  }
+
+  return null;
+};
+
+export class ClaudeProviderModels implements IProviderModels {
+  async getSupportedModels(): Promise<ProviderModelsDefinition> {
+    let queryInstance: ReturnType<typeof query> | null = null;
+
+    try {
+      // The SDK exposes its runtime model catalog on the initialized query
+      // instance, so we create a lightweight query and immediately close it
+      // after reading the control-plane metadata.
+      queryInstance = query({
+        prompt: 'Get supported models',
+        options: buildClaudeQueryOptions(),
+      });
+
+      const supportedModels = await queryInstance.supportedModels();
+
+      return buildClaudeModelsDefinition(supportedModels);
+    } catch {
+      return CLAUDE_FALLBACK_MODELS;
+    } finally {
+      queryInstance?.close();
+    }
+  }
+
+  async getCurrentActiveModel(sessionId?: string): Promise<ProviderCurrentActiveModel> {
+    if (!sessionId?.trim()) {
+      return buildDefaultProviderCurrentActiveModel(await this.getSupportedModels());
+    }
+
+    try {
+      const jsonlPath = sessionsDb.getSessionById(sessionId)?.jsonl_path;
+      const activeModel = jsonlPath
+        ? await readClaudeSessionModelFromJsonl(sessionId, jsonlPath)
+        : null;
+      if (activeModel?.model) {
+        return activeModel;
+      }
+    } catch {
+      // Fall through to the provider default when the session-backed lookup fails.
+    }
+
+    return buildDefaultProviderCurrentActiveModel(await this.getSupportedModels());
+  }
+
+  async changeActiveModel(
+    input: ProviderChangeActiveModelInput,
+  ): Promise<ProviderSessionActiveModelChange> {
+    return writeProviderSessionActiveModelChange('claude', input);
+  }
+}
diff --git a/server/modules/providers/list/claude/claude.provider.ts b/server/modules/providers/list/claude/claude.provider.ts
index efd3bd4a..33a75210 100644
--- a/server/modules/providers/list/claude/claude.provider.ts
+++ b/server/modules/providers/list/claude/claude.provider.ts
@@ -1,17 +1,20 @@
 import { AbstractProvider } from '@/modules/providers/shared/base/abstract.provider.js';
 import { ClaudeProviderAuth } from '@/modules/providers/list/claude/claude-auth.provider.js';
+import { ClaudeProviderModels } from '@/modules/providers/list/claude/claude-models.provider.js';
 import { ClaudeMcpProvider } from '@/modules/providers/list/claude/claude-mcp.provider.js';
 import { ClaudeSessionSynchronizer } from '@/modules/providers/list/claude/claude-session-synchronizer.provider.js';
 import { ClaudeSessionsProvider } from '@/modules/providers/list/claude/claude-sessions.provider.js';
 import { ClaudeSkillsProvider } from '@/modules/providers/list/claude/claude-skills.provider.js';
 import type {
   IProviderAuth,
+  IProviderModels,
   IProviderSessionSynchronizer,
   IProviderSkills,
   IProviderSessions,
 } from '@/shared/interfaces.js';
 
 export class ClaudeProvider extends AbstractProvider {
+  readonly models: IProviderModels = new ClaudeProviderModels();
   readonly mcp = new ClaudeMcpProvider();
   readonly auth: IProviderAuth = new ClaudeProviderAuth();
   readonly skills: IProviderSkills = new ClaudeSkillsProvider();
diff --git a/server/modules/providers/list/codex/codex-models.provider.ts b/server/modules/providers/list/codex/codex-models.provider.ts
new file mode 100644
index 00000000..de4de0ea
--- /dev/null
+++ b/server/modules/providers/list/codex/codex-models.provider.ts
@@ -0,0 +1,125 @@
+import { readFile } from 'node:fs/promises';
+import os from 'node:os';
+import path from 'node:path';
+
+import TOML from '@iarna/toml';
+
+import type { IProviderModels } from '@/shared/interfaces.js';
+import type {
+  ProviderChangeActiveModelInput,
+  ProviderCurrentActiveModel,
+  ProviderModelOption,
+  ProviderModelsDefinition,
+  ProviderSessionActiveModelChange,
+} from '@/shared/types.js';
+import {
+  buildDefaultProviderCurrentActiveModel,
+  readObjectRecord,
+  readOptionalString,
+  writeProviderSessionActiveModelChange,
+} from '@/shared/utils.js';
+
+export const CODEX_FALLBACK_MODELS: ProviderModelsDefinition = {
+  OPTIONS: [
+    { value: 'gpt-5.5', label: 'gpt-5.5' },
+    { value: 'gpt-5.4', label: 'gpt-5.4' },
+    { value: 'gpt-5.4-mini', label: 'gpt-5.4-mini' },
+    { value: 'gpt-5.3-codex', label: 'gpt-5.3-codex' },
+    { value: 'gpt-5.2', label: 'gpt-5.2' },
+  ],
+  DEFAULT: 'gpt-5.4',
+};
+
+type CodexCachedModel = {
+  slug?: string;
+  display_name?: string;
+  description?: string;
+  priority?: number;
+  visibility?: string;
+  supported_in_api?: boolean;
+};
+
+const CODEX_MODELS_CACHE_PATH = path.join(os.homedir(), '.codex', 'models_cache.json');
+const CODEX_CONFIG_PATH = path.join(os.homedir(), '.codex', 'config.toml');
+
+const isCodexCachedModel = (value: unknown): value is CodexCachedModel => {
+  const record = readObjectRecord(value);
+  return Boolean(record && readOptionalString(record.slug));
+};
+
+const readCodexPriority = (value: unknown): number => (
+  typeof value === 'number' && Number.isFinite(value) ? value : Number.MAX_SAFE_INTEGER
+);
+
+const mapCodexModel = (model: CodexCachedModel): ProviderModelOption => ({
+  value: model.slug as string,
+  label: readOptionalString(model.display_name) ?? (model.slug as string),
+  description: readOptionalString(model.description),
+});
+
+const buildCodexModelsDefinition = (models: CodexCachedModel[]): ProviderModelsDefinition => {
+  const sortedModels = [...models]
+    .filter((model) => model.visibility !== 'hidden' && model.supported_in_api !== false)
+    .sort((left, right) => readCodexPriority(left.priority) - readCodexPriority(right.priority));
+
+  const options: ProviderModelOption[] = [];
+  const seenValues = new Set<string>();
+
+  for (const model of sortedModels) {
+    const mappedModel = mapCodexModel(model);
+    if (seenValues.has(mappedModel.value)) {
+      continue;
+    }
+
+    seenValues.add(mappedModel.value);
+    options.push(mappedModel);
+  }
+
+  if (options.length === 0) {
+    return CODEX_FALLBACK_MODELS;
+  }
+
+  return {
+    OPTIONS: options,
+    DEFAULT: options[0]?.value ?? CODEX_FALLBACK_MODELS.DEFAULT,
+  };
+};
+
+export class CodexProviderModels implements IProviderModels {
+  async getSupportedModels(): Promise<ProviderModelsDefinition> {
+    try {
+      const raw = await readFile(CODEX_MODELS_CACHE_PATH, 'utf8');
+      const parsed = readObjectRecord(JSON.parse(raw));
+      const models = Array.isArray(parsed?.models)
+        ? parsed.models.filter(isCodexCachedModel)
+        : [];
+
+      return buildCodexModelsDefinition(models);
+    } catch {
+      return CODEX_FALLBACK_MODELS;
+    }
+  }
+
+  async getCurrentActiveModel(): Promise<ProviderCurrentActiveModel> {
+    try {
+      const raw = await readFile(CODEX_CONFIG_PATH, 'utf8');
+      const parsed = readObjectRecord(TOML.parse(raw));
+      const model = readOptionalString(parsed?.model);
+      if (!model) {
+        return buildDefaultProviderCurrentActiveModel(await this.getSupportedModels());
+      }
+
+      return {
+        model,
+      };
+    } catch {
+      return buildDefaultProviderCurrentActiveModel(await this.getSupportedModels());
+    }
+  }
+
+  async changeActiveModel(
+    input: ProviderChangeActiveModelInput,
+  ): Promise<ProviderSessionActiveModelChange> {
+    return writeProviderSessionActiveModelChange('codex', input);
+  }
+}
diff --git a/server/modules/providers/list/codex/codex-skills.provider.ts b/server/modules/providers/list/codex/codex-skills.provider.ts
index a4dd4add..fe61af51 100644
--- a/server/modules/providers/list/codex/codex-skills.provider.ts
+++ b/server/modules/providers/list/codex/codex-skills.provider.ts
@@ -1,52 +1,12 @@
-import fs from 'node:fs/promises';
 import os from 'node:os';
 import path from 'node:path';
 
 import { SkillsProvider } from '@/modules/providers/shared/skills/skills.provider.js';
 import type { ProviderSkillSource } from '@/shared/types.js';
-
-const hasGitMarker = async (dirPath: string): Promise<boolean> => {
-  try {
-    const gitMarkerStats = await fs.stat(path.join(dirPath, '.git'));
-    return gitMarkerStats.isDirectory() || gitMarkerStats.isFile();
-  } catch {
-    return false;
-  }
-};
-
-const findTopmostGitRoot = async (startPath: string): Promise<string | null> => {
-  let currentPath = path.resolve(startPath);
-  let topmostGitRoot: string | null = null;
-
-  while (true) {
-    if (await hasGitMarker(currentPath)) {
-      topmostGitRoot = currentPath;
-    }
-
-    const parentPath = path.dirname(currentPath);
-    if (parentPath === currentPath) {
-      break;
-    }
-
-    currentPath = parentPath;
-  }
-
-  return topmostGitRoot;
-};
-
-const addUniqueSource = (
-  sources: ProviderSkillSource[],
-  seenRootDirs: Set<string>,
-  source: ProviderSkillSource,
-): void => {
-  const normalizedRootDir = path.resolve(source.rootDir);
-  if (seenRootDirs.has(normalizedRootDir)) {
-    return;
-  }
-
-  seenRootDirs.add(normalizedRootDir);
-  sources.push({ ...source, rootDir: normalizedRootDir });
-};
+import {
+  addUniqueProviderSkillSource,
+  findTopmostGitRoot,
+} from '@/shared/utils.js';
 
 export class CodexSkillsProvider extends SkillsProvider {
   constructor() {
@@ -58,7 +18,7 @@ export class CodexSkillsProvider extends SkillsProvider {
     const seenRootDirs = new Set<string>();
     const repoRoot = await findTopmostGitRoot(workspacePath);
 
-    addUniqueSource(sources, seenRootDirs, {
+    addUniqueProviderSkillSource(sources, seenRootDirs, {
       scope: 'repo',
       rootDir: path.join(workspacePath, '.agents', 'skills'),
       commandPrefix: '$',
@@ -67,29 +27,29 @@ export class CodexSkillsProvider extends SkillsProvider {
     if (repoRoot) {
       // Codex checks repository skills at the launch folder, one folder above it,
       // and the topmost git root; these can collapse to the same directory.
-      addUniqueSource(sources, seenRootDirs, {
+      addUniqueProviderSkillSource(sources, seenRootDirs, {
         scope: 'repo',
         rootDir: path.join(path.dirname(workspacePath), '.agents', 'skills'),
         commandPrefix: '$',
       });
-      addUniqueSource(sources, seenRootDirs, {
+      addUniqueProviderSkillSource(sources, seenRootDirs, {
         scope: 'repo',
         rootDir: path.join(repoRoot, '.agents', 'skills'),
         commandPrefix: '$',
       });
     }
 
-    addUniqueSource(sources, seenRootDirs, {
+    addUniqueProviderSkillSource(sources, seenRootDirs, {
       scope: 'user',
       rootDir: path.join(os.homedir(), '.agents', 'skills'),
       commandPrefix: '$',
     });
-    addUniqueSource(sources, seenRootDirs, {
+    addUniqueProviderSkillSource(sources, seenRootDirs, {
       scope: 'admin',
       rootDir: path.join('/etc', 'codex', 'skills'),
       commandPrefix: '$',
     });
-    addUniqueSource(sources, seenRootDirs, {
+    addUniqueProviderSkillSource(sources, seenRootDirs, {
       scope: 'system',
       rootDir: path.join(os.homedir(), '.codex', 'skills', '.system'),
       commandPrefix: '$',
diff --git a/server/modules/providers/list/codex/codex.provider.ts b/server/modules/providers/list/codex/codex.provider.ts
index 811ff6de..25fc6bad 100644
--- a/server/modules/providers/list/codex/codex.provider.ts
+++ b/server/modules/providers/list/codex/codex.provider.ts
@@ -1,17 +1,20 @@
 import { AbstractProvider } from '@/modules/providers/shared/base/abstract.provider.js';
 import { CodexProviderAuth } from '@/modules/providers/list/codex/codex-auth.provider.js';
+import { CodexProviderModels } from '@/modules/providers/list/codex/codex-models.provider.js';
 import { CodexMcpProvider } from '@/modules/providers/list/codex/codex-mcp.provider.js';
 import { CodexSessionSynchronizer } from '@/modules/providers/list/codex/codex-session-synchronizer.provider.js';
 import { CodexSessionsProvider } from '@/modules/providers/list/codex/codex-sessions.provider.js';
 import { CodexSkillsProvider } from '@/modules/providers/list/codex/codex-skills.provider.js';
 import type {
   IProviderAuth,
+  IProviderModels,
   IProviderSessionSynchronizer,
   IProviderSkills,
   IProviderSessions,
 } from '@/shared/interfaces.js';
 
 export class CodexProvider extends AbstractProvider {
+  readonly models: IProviderModels = new CodexProviderModels();
   readonly mcp = new CodexMcpProvider();
   readonly auth: IProviderAuth = new CodexProviderAuth();
   readonly skills: IProviderSkills = new CodexSkillsProvider();
diff --git a/server/modules/providers/list/cursor/cursor-models.provider.ts b/server/modules/providers/list/cursor/cursor-models.provider.ts
new file mode 100644
index 00000000..a554a0e6
--- /dev/null
+++ b/server/modules/providers/list/cursor/cursor-models.provider.ts
@@ -0,0 +1,283 @@
+import { access, readdir } from 'node:fs/promises';
+import os from 'node:os';
+import path from 'node:path';
+import { spawn } from 'node:child_process';
+
+import crossSpawn from 'cross-spawn';
+
+import type { IProviderModels } from '@/shared/interfaces.js';
+import type {
+  ProviderChangeActiveModelInput,
+  ProviderCurrentActiveModel,
+  ProviderModelOption,
+  ProviderModelsDefinition,
+  ProviderSessionActiveModelChange,
+} from '@/shared/types.js';
+import {
+  buildDefaultProviderCurrentActiveModel,
+  sanitizeLeafDirectoryName,
+  writeProviderSessionActiveModelChange,
+} from '@/shared/utils.js';
+
+export const CURSOR_FALLBACK_MODELS: ProviderModelsDefinition = {
+  OPTIONS: [
+    { value: "opus-4.6-thinking", label: "Claude 4.6 Opus (Thinking)" },
+    { value: "gpt-5.3-codex", label: "GPT-5.3" },
+    { value: "gpt-5.2-high", label: "GPT-5.2 High" },
+    { value: "gemini-3-pro", label: "Gemini 3 Pro" },
+    { value: "opus-4.5-thinking", label: "Claude 4.5 Opus (Thinking)" },
+    { value: "gpt-5.2", label: "GPT-5.2" },
+    { value: "gpt-5.1", label: "GPT-5.1" },
+    { value: "gpt-5.1-high", label: "GPT-5.1 High" },
+    { value: "composer-1", label: "Composer 1" },
+    { value: "auto", label: "Auto" },
+    { value: "sonnet-4.5", label: "Claude 4.5 Sonnet" },
+    { value: "sonnet-4.5-thinking", label: "Claude 4.5 Sonnet (Thinking)" },
+    { value: "opus-4.5", label: "Claude 4.5 Opus" },
+    { value: "gpt-5.1-codex", label: "GPT-5.1 Codex" },
+    { value: "gpt-5.1-codex-high", label: "GPT-5.1 Codex High" },
+    { value: "gpt-5.1-codex-max", label: "GPT-5.1 Codex Max" },
+    { value: "gpt-5.1-codex-max-high", label: "GPT-5.1 Codex Max High" },
+    { value: "opus-4.1", label: "Claude 4.1 Opus" },
+    { value: "grok", label: "Grok" },
+  ],
+  DEFAULT: 'composer-2-fast',
+};
+
+type CursorModelRow = {
+  name: string;
+  description: string;
+  current: boolean;
+  default: boolean;
+};
+
+const CURSOR_MODELS_TIMEOUT_MS = 10_000;
+const CURSOR_CHATS_ROOT = path.join(os.homedir(), '.cursor', 'chats');
+const spawnFunction = process.platform === 'win32' ? crossSpawn : spawn;
+const ANSI_PATTERN = new RegExp(
+  // eslint-disable-next-line no-control-regex
+  '[\\u001B\\u009B][[\\]()#;?]*(?:'
+  + '(?:[0-9]{1,4}(?:;[0-9]{0,4})*)?[0-9A-ORZcf-nqry=><]'
+  + '|(?:[\\dA-PR-TZcf-ntqry=><~]))',
+  'g',
+);
+
+const stripAnsi = (value: string): string => value.replace(ANSI_PATTERN, '');
+
+const parseModelLine = (line: string): CursorModelRow | null => {
+  const trimmed = line.trim();
+
+  if (
+    !trimmed
+    || trimmed === 'Available models'
+    || trimmed.startsWith('Loading models')
+    || trimmed.startsWith('Tip:')
+  ) {
+    return null;
+  }
+
+  const match = trimmed.match(/^(.+?)\s+-\s+(.+)$/);
+  if (!match) {
+    return null;
+  }
+
+  const name = match[1].trim();
+  let description = match[2].trim();
+  const current = /\(current\)/i.test(description);
+  const defaultModel = /\(default\)/i.test(description);
+
+  description = description.replace(/\s*\((current|default)\)/gi, '').replace(/\s{2,}/g, ' ').trim();
+
+  return {
+    name,
+    description,
+    current,
+    default: defaultModel,
+  };
+};
+
+const parseModelsOutput = (text: string): CursorModelRow[] => {
+  const models: CursorModelRow[] = [];
+
+  for (const line of stripAnsi(text).split(/\r?\n/)) {
+    const parsed = parseModelLine(line);
+    if (parsed) {
+      models.push(parsed);
+    }
+  }
+
+  return models;
+};
+
+const runCursorListModels = (): Promise<string> => new Promise((resolve, reject) => {
+  const cursorProcess = spawnFunction('cursor-agent', ['--list-models'], {
+    env: { ...process.env },
+  });
+
+  let stdout = '';
+  let stderr = '';
+  let settled = false;
+
+  const timer = setTimeout(() => {
+    cursorProcess.kill('SIGTERM');
+    if (!settled) {
+      settled = true;
+      reject(new Error('cursor-agent --list-models timed out'));
+    }
+  }, CURSOR_MODELS_TIMEOUT_MS);
+
+  const finish = (error: Error | null, output: string) => {
+    if (settled) {
+      return;
+    }
+
+    settled = true;
+    clearTimeout(timer);
+
+    if (error) {
+      reject(error);
+      return;
+    }
+
+    resolve(output);
+  };
+
+  cursorProcess.stdout?.on('data', (chunk: Buffer) => {
+    stdout += chunk.toString();
+  });
+
+  cursorProcess.stderr?.on('data', (chunk: Buffer) => {
+    stderr += chunk.toString();
+  });
+
+  cursorProcess.on('error', (error) => {
+    finish(error instanceof Error ? error : new Error(String(error)), '');
+  });
+
+  cursorProcess.on('close', (code) => {
+    if (code !== 0) {
+      finish(new Error(stderr.trim() || `cursor-agent --list-models exited with code ${code}`), '');
+      return;
+    }
+
+    finish(null, stdout);
+  });
+});
+
+const buildCursorModelsDefinition = (models: CursorModelRow[]): ProviderModelsDefinition => {
+  const options: ProviderModelOption[] = [];
+  const seenValues = new Set<string>();
+
+  for (const model of models) {
+    if (seenValues.has(model.name)) {
+      continue;
+    }
+
+    seenValues.add(model.name);
+    options.push({
+      value: model.name,
+      label: model.name,
+      description: model.description || undefined,
+    });
+  }
+
+  if (options.length === 0) {
+    return CURSOR_FALLBACK_MODELS;
+  }
+
+  const defaultValue = models.find((model) => model.default)?.name
+    ?? models.find((model) => model.current)?.name
+    ?? options[0]?.value
+    ?? CURSOR_FALLBACK_MODELS.DEFAULT;
+
+  return {
+    OPTIONS: options,
+    DEFAULT: defaultValue,
+  };
+};
+
+const resolveCursorSessionStorePath = async (sessionId: string): Promise<string | null> => {
+  const safeSessionId = sanitizeLeafDirectoryName(sessionId, 'cursor session id');
+
+  try {
+    const workspaceEntries = await readdir(CURSOR_CHATS_ROOT, { withFileTypes: true });
+    for (const workspaceEntry of workspaceEntries) {
+      if (!workspaceEntry.isDirectory()) {
+        continue;
+      }
+
+      const storeDbPath = path.join(CURSOR_CHATS_ROOT, workspaceEntry.name, safeSessionId, 'store.db');
+      try {
+        await access(storeDbPath);
+        return storeDbPath;
+      } catch {
+        // Keep scanning sibling workspaces until the matching session directory is found.
+      }
+    }
+  } catch {
+    return null;
+  }
+
+  return null;
+};
+
+export class CursorProviderModels implements IProviderModels {
+  async getSupportedModels(): Promise<ProviderModelsDefinition> {
+    try {
+      const stdout = await runCursorListModels();
+      const models = parseModelsOutput(stdout);
+      return buildCursorModelsDefinition(models);
+    } catch {
+      return CURSOR_FALLBACK_MODELS;
+    }
+  }
+
+  async getCurrentActiveModel(sessionId?: string): Promise<ProviderCurrentActiveModel> {
+    if (!sessionId?.trim()) {
+      return buildDefaultProviderCurrentActiveModel(await this.getSupportedModels());
+    }
+
+    try {
+      const storeDbPath = await resolveCursorSessionStorePath(sessionId);
+      if (!storeDbPath) {
+        return buildDefaultProviderCurrentActiveModel(await this.getSupportedModels());
+      }
+
+      const { default: Database } = await import('better-sqlite3');
+      const db = new Database(storeDbPath, { readonly: true, fileMustExist: true });
+
+      try {
+        const row = db.prepare(`SELECT value FROM meta WHERE key='0' LIMIT 1;`).get() as {
+          value?: Buffer | string;
+        } | undefined;
+        const metadataText = Buffer.isBuffer(row?.value)
+          ? row.value.toString('utf8')
+          : typeof row?.value === 'string' && row.value.trim()
+            ? Buffer.from(row.value.trim(), 'hex').toString('utf8')
+            : '';
+        if (!metadataText) {
+          return buildDefaultProviderCurrentActiveModel(await this.getSupportedModels());
+        }
+
+        const metadata = JSON.parse(metadataText) as { lastUsedModel?: string };
+        if (typeof metadata.lastUsedModel === 'string' && metadata.lastUsedModel.trim()) {
+          return {
+            model: metadata.lastUsedModel.trim(),
+          };
+        }
+      } finally {
+        db.close();
+      }
+    } catch {
+      // Fall through to the provider default when Cursor metadata cannot be read.
+    }
+
+    return buildDefaultProviderCurrentActiveModel(await this.getSupportedModels());
+  }
+
+  async changeActiveModel(
+    input: ProviderChangeActiveModelInput,
+  ): Promise<ProviderSessionActiveModelChange> {
+    return writeProviderSessionActiveModelChange('cursor', input);
+  }
+}
diff --git a/server/modules/providers/list/cursor/cursor-sessions.provider.ts b/server/modules/providers/list/cursor/cursor-sessions.provider.ts
index 90c9afa0..33f93ea5 100644
--- a/server/modules/providers/list/cursor/cursor-sessions.provider.ts
+++ b/server/modules/providers/list/cursor/cursor-sessions.provider.ts
@@ -4,7 +4,12 @@ import path from 'node:path';
 
 import type { IProviderSessions } from '@/shared/interfaces.js';
 import type { AnyRecord, FetchHistoryOptions, FetchHistoryResult, NormalizedMessage } from '@/shared/types.js';
-import { createNormalizedMessage, generateMessageId, readObjectRecord } from '@/shared/utils.js';
+import {
+  createNormalizedMessage,
+  generateMessageId,
+  readObjectRecord,
+  sanitizeLeafDirectoryName,
+} from '@/shared/utils.js';
 
 const PROVIDER = 'cursor';
 
@@ -186,24 +191,6 @@ function normalizeCursorToolInput(toolName: string, rawInput: unknown): unknown
   return normalized;
 }
 
-function sanitizeCursorSessionId(sessionId: string): string {
-  const normalized = sessionId.trim();
-  if (!normalized) {
-    throw new Error('Cursor session id is required.');
-  }
-
-  if (
-    normalized.includes('..')
-    || normalized.includes(path.posix.sep)
-    || normalized.includes(path.win32.sep)
-    || normalized !== path.basename(normalized)
-  ) {
-    throw new Error(`Invalid cursor session id "${sessionId}".`);
-  }
-
-  return normalized;
-}
-
 export class CursorSessionsProvider implements IProviderSessions {
   /**
    * Loads Cursor's SQLite blob DAG and returns message blobs in conversation
@@ -214,7 +201,7 @@ export class CursorSessionsProvider implements IProviderSessions {
     const { default: Database } = await import('better-sqlite3');
 
     const cwdId = crypto.createHash('md5').update(projectPath || process.cwd()).digest('hex');
-    const safeSessionId = sanitizeCursorSessionId(sessionId);
+    const safeSessionId = sanitizeLeafDirectoryName(sessionId, 'cursor session id');
     const baseChatsPath = path.join(os.homedir(), '.cursor', 'chats', cwdId);
     const storeDbPath = path.join(baseChatsPath, safeSessionId, 'store.db');
     const resolvedBaseChatsPath = path.resolve(baseChatsPath);
diff --git a/server/modules/providers/list/cursor/cursor.provider.ts b/server/modules/providers/list/cursor/cursor.provider.ts
index 7fc4abf5..ad125815 100644
--- a/server/modules/providers/list/cursor/cursor.provider.ts
+++ b/server/modules/providers/list/cursor/cursor.provider.ts
@@ -1,17 +1,20 @@
 import { AbstractProvider } from '@/modules/providers/shared/base/abstract.provider.js';
 import { CursorProviderAuth } from '@/modules/providers/list/cursor/cursor-auth.provider.js';
+import { CursorProviderModels } from '@/modules/providers/list/cursor/cursor-models.provider.js';
 import { CursorMcpProvider } from '@/modules/providers/list/cursor/cursor-mcp.provider.js';
 import { CursorSessionSynchronizer } from '@/modules/providers/list/cursor/cursor-session-synchronizer.provider.js';
 import { CursorSessionsProvider } from '@/modules/providers/list/cursor/cursor-sessions.provider.js';
 import { CursorSkillsProvider } from '@/modules/providers/list/cursor/cursor-skills.provider.js';
 import type {
   IProviderAuth,
+  IProviderModels,
   IProviderSessionSynchronizer,
   IProviderSkills,
   IProviderSessions,
 } from '@/shared/interfaces.js';
 
 export class CursorProvider extends AbstractProvider {
+  readonly models: IProviderModels = new CursorProviderModels();
   readonly mcp = new CursorMcpProvider();
   readonly auth: IProviderAuth = new CursorProviderAuth();
   readonly skills: IProviderSkills = new CursorSkillsProvider();
diff --git a/server/modules/providers/list/gemini/gemini-models.provider.ts b/server/modules/providers/list/gemini/gemini-models.provider.ts
new file mode 100644
index 00000000..fc830394
--- /dev/null
+++ b/server/modules/providers/list/gemini/gemini-models.provider.ts
@@ -0,0 +1,42 @@
+import type { IProviderModels } from '@/shared/interfaces.js';
+import type {
+  ProviderChangeActiveModelInput,
+  ProviderCurrentActiveModel,
+  ProviderModelsDefinition,
+  ProviderSessionActiveModelChange,
+} from '@/shared/types.js';
+import {
+  buildDefaultProviderCurrentActiveModel,
+  writeProviderSessionActiveModelChange,
+} from '@/shared/utils.js';
+
+export const GEMINI_FALLBACK_MODELS: ProviderModelsDefinition = {
+  OPTIONS: [
+    { value: 'gemini-3.1-pro-preview', label: 'Gemini 3.1 Pro Preview' },
+    { value: 'gemini-3-pro-preview', label: 'Gemini 3 Pro Preview' },
+    { value: 'gemini-3-flash-preview', label: 'Gemini 3 Flash Preview' },
+    { value: 'gemini-2.5-flash', label: 'Gemini 2.5 Flash' },
+    { value: 'gemini-2.5-pro', label: 'Gemini 2.5 Pro' },
+    { value: 'gemini-2.0-flash-lite', label: 'Gemini 2.0 Flash Lite' },
+    { value: 'gemini-2.0-flash', label: 'Gemini 2.0 Flash' },
+    { value: 'gemini-2.0-pro-exp', label: 'Gemini 2.0 Pro Experimental' },
+    { value: 'gemini-2.0-flash-thinking-exp', label: 'Gemini 2.0 Flash Thinking' },
+  ],
+  DEFAULT: 'gemini-3.1-pro-preview',
+};
+
+export class GeminiProviderModels implements IProviderModels {
+  async getSupportedModels(): Promise<ProviderModelsDefinition> {
+    return GEMINI_FALLBACK_MODELS;
+  }
+
+  async getCurrentActiveModel(): Promise<ProviderCurrentActiveModel> {
+    return buildDefaultProviderCurrentActiveModel(GEMINI_FALLBACK_MODELS);
+  }
+
+  async changeActiveModel(
+    input: ProviderChangeActiveModelInput,
+  ): Promise<ProviderSessionActiveModelChange> {
+    return writeProviderSessionActiveModelChange('gemini', input);
+  }
+}
diff --git a/server/modules/providers/list/gemini/gemini.provider.ts b/server/modules/providers/list/gemini/gemini.provider.ts
index 626cacf6..38d25245 100644
--- a/server/modules/providers/list/gemini/gemini.provider.ts
+++ b/server/modules/providers/list/gemini/gemini.provider.ts
@@ -1,17 +1,20 @@
 import { AbstractProvider } from '@/modules/providers/shared/base/abstract.provider.js';
 import { GeminiProviderAuth } from '@/modules/providers/list/gemini/gemini-auth.provider.js';
+import { GeminiProviderModels } from '@/modules/providers/list/gemini/gemini-models.provider.js';
 import { GeminiMcpProvider } from '@/modules/providers/list/gemini/gemini-mcp.provider.js';
 import { GeminiSessionSynchronizer } from '@/modules/providers/list/gemini/gemini-session-synchronizer.provider.js';
 import { GeminiSessionsProvider } from '@/modules/providers/list/gemini/gemini-sessions.provider.js';
 import { GeminiSkillsProvider } from '@/modules/providers/list/gemini/gemini-skills.provider.js';
 import type {
   IProviderAuth,
+  IProviderModels,
   IProviderSessionSynchronizer,
   IProviderSkills,
   IProviderSessions,
 } from '@/shared/interfaces.js';
 
 export class GeminiProvider extends AbstractProvider {
+  readonly models: IProviderModels = new GeminiProviderModels();
   readonly mcp = new GeminiMcpProvider();
   readonly auth: IProviderAuth = new GeminiProviderAuth();
   readonly skills: IProviderSkills = new GeminiSkillsProvider();
diff --git a/server/modules/providers/list/opencode/opencode-auth.provider.ts b/server/modules/providers/list/opencode/opencode-auth.provider.ts
new file mode 100644
index 00000000..9f55d18b
--- /dev/null
+++ b/server/modules/providers/list/opencode/opencode-auth.provider.ts
@@ -0,0 +1,111 @@
+import { readFile } from 'node:fs/promises';
+import os from 'node:os';
+import path from 'node:path';
+
+import spawn from 'cross-spawn';
+
+import type { IProviderAuth } from '@/shared/interfaces.js';
+import type { ProviderAuthStatus } from '@/shared/types.js';
+import { readObjectRecord, readOptionalString } from '@/shared/utils.js';
+
+type OpenCodeCredentialsStatus = {
+  authenticated: boolean;
+  email: string | null;
+  method: string | null;
+  error?: string;
+};
+
+const OPENCODE_ENV_CREDENTIAL_KEYS = [
+  'ANTHROPIC_API_KEY',
+  'OPENAI_API_KEY',
+  'GOOGLE_GENERATIVE_AI_API_KEY',
+  'GEMINI_API_KEY',
+  'GROQ_API_KEY',
+  'OPENROUTER_API_KEY',
+];
+
+export class OpenCodeProviderAuth implements IProviderAuth {
+  /**
+   * Checks whether the OpenCode CLI is available to the server process.
+   */
+  private checkInstalled(): boolean {
+    try {
+      const result = spawn.sync('opencode', ['--version'], { stdio: 'ignore', timeout: 5000 });
+      return !result.error && result.status === 0;
+    } catch {
+      return false;
+    }
+  }
+
+  /**
+   * Returns OpenCode CLI installation and credential status.
+   */
+  async getStatus(): Promise<ProviderAuthStatus> {
+    const installed = this.checkInstalled();
+    const credentials = await this.checkCredentials();
+
+    return {
+      installed,
+      provider: 'opencode',
+      authenticated: credentials.authenticated,
+      email: credentials.email,
+      method: credentials.method,
+      error: credentials.authenticated ? undefined : credentials.error || 'Not authenticated',
+    };
+  }
+
+  /**
+   * Reads OpenCode's auth store or falls back to provider API key environment variables.
+   */
+  private async checkCredentials(): Promise<OpenCodeCredentialsStatus> {
+    try {
+      const authPath = path.join(os.homedir(), '.local', 'share', 'opencode', 'auth.json');
+      const content = await readFile(authPath, 'utf8');
+      const auth = readObjectRecord(JSON.parse(content)) ?? {};
+
+      for (const [providerId, providerAuth] of Object.entries(auth)) {
+        const providerRecord = readObjectRecord(providerAuth);
+        if (!providerRecord) {
+          continue;
+        }
+
+        const hasCredential = Object.values(providerRecord).some(
+          (value) => readOptionalString(value) !== undefined || Boolean(readObjectRecord(value)),
+        );
+        if (hasCredential) {
+          return {
+            authenticated: true,
+            email: `${providerId} credentials`,
+            method: 'credentials_file',
+          };
+        }
+      }
+    } catch (error) {
+      const code = (error as NodeJS.ErrnoException).code;
+      if (code !== 'ENOENT') {
+        return {
+          authenticated: false,
+          email: null,
+          method: null,
+          error: error instanceof Error ? error.message : 'Failed to read OpenCode auth',
+        };
+      }
+    }
+
+    const envCredential = OPENCODE_ENV_CREDENTIAL_KEYS.find((key) => process.env[key]?.trim());
+    if (envCredential) {
+      return {
+        authenticated: true,
+        email: envCredential,
+        method: 'environment',
+      };
+    }
+
+    return {
+      authenticated: false,
+      email: null,
+      method: null,
+      error: 'OpenCode not configured',
+    };
+  }
+}
diff --git a/server/modules/providers/list/opencode/opencode-mcp.provider.ts b/server/modules/providers/list/opencode/opencode-mcp.provider.ts
new file mode 100644
index 00000000..f2020382
--- /dev/null
+++ b/server/modules/providers/list/opencode/opencode-mcp.provider.ts
@@ -0,0 +1,228 @@
+import { access, mkdir, readFile, writeFile } from 'node:fs/promises';
+import os from 'node:os';
+import path from 'node:path';
+
+import { McpProvider } from '@/modules/providers/shared/mcp/mcp.provider.js';
+import type { McpScope, ProviderMcpServer, UpsertProviderMcpServerInput } from '@/shared/types.js';
+import {
+  AppError,
+  readObjectRecord,
+  readOptionalString,
+  readStringArray,
+  readStringRecord,
+} from '@/shared/utils.js';
+
+type OpenCodeConfigPath = {
+  filePath: string;
+  exists: boolean;
+};
+
+const fileExists = async (filePath: string): Promise<boolean> => {
+  try {
+    await access(filePath);
+    return true;
+  } catch {
+    return false;
+  }
+};
+
+/**
+ * Removes JSONC comments without touching comment-like text inside strings.
+ */
+const stripJsonComments = (content: string): string => {
+  let output = '';
+  let inString = false;
+  let quote = '';
+  let escaped = false;
+
+  for (let index = 0; index < content.length; index += 1) {
+    const char = content[index];
+    const next = content[index + 1];
+
+    if (inString) {
+      output += char;
+      if (escaped) {
+        escaped = false;
+      } else if (char === '\\') {
+        escaped = true;
+      } else if (char === quote) {
+        inString = false;
+        quote = '';
+      }
+      continue;
+    }
+
+    if (char === '"' || char === '\'') {
+      inString = true;
+      quote = char;
+      output += char;
+      continue;
+    }
+
+    if (char === '/' && next === '/') {
+      while (index < content.length && content[index] !== '\n') {
+        index += 1;
+      }
+      output += '\n';
+      continue;
+    }
+
+    if (char === '/' && next === '*') {
+      index += 2;
+      while (index < content.length && !(content[index] === '*' && content[index + 1] === '/')) {
+        index += 1;
+      }
+      index += 1;
+      continue;
+    }
+
+    output += char;
+  }
+
+  return output;
+};
+
+const stripTrailingCommas = (content: string): string =>
+  content.replace(/,\s*([}\]])/g, '$1');
+
+const readOpenCodeConfig = async (filePath: string): Promise<Record<string, unknown>> => {
+  try {
+    const content = await readFile(filePath, 'utf8');
+    const parsed = JSON.parse(stripTrailingCommas(stripJsonComments(content))) as unknown;
+    return readObjectRecord(parsed) ?? {};
+  } catch (error) {
+    const code = (error as NodeJS.ErrnoException).code;
+    if (code === 'ENOENT') {
+      return {};
+    }
+
+    throw error;
+  }
+};
+
+const writeOpenCodeConfig = async (filePath: string, data: Record<string, unknown>): Promise<void> => {
+  await mkdir(path.dirname(filePath), { recursive: true });
+  await writeFile(filePath, `${JSON.stringify(data, null, 2)}\n`, 'utf8');
+};
+
+const resolveOpenCodeConfigPath = async (scope: McpScope, workspacePath: string): Promise<OpenCodeConfigPath> => {
+  const root = scope === 'user'
+    ? path.join(os.homedir(), '.config', 'opencode')
+    : workspacePath;
+  const jsonPath = path.join(root, 'opencode.json');
+  const jsoncPath = path.join(root, 'opencode.jsonc');
+
+  if (await fileExists(jsonPath)) {
+    return { filePath: jsonPath, exists: true };
+  }
+
+  if (await fileExists(jsoncPath)) {
+    return { filePath: jsoncPath, exists: true };
+  }
+
+  return { filePath: jsonPath, exists: false };
+};
+
+export class OpenCodeMcpProvider extends McpProvider {
+  constructor() {
+    super('opencode', ['user', 'project'], ['stdio', 'http']);
+  }
+
+  protected async readScopedServers(scope: McpScope, workspacePath: string): Promise<Record<string, unknown>> {
+    const { filePath } = await resolveOpenCodeConfigPath(scope, workspacePath);
+    const config = await readOpenCodeConfig(filePath);
+    return readObjectRecord(config.mcp) ?? {};
+  }
+
+  protected async writeScopedServers(
+    scope: McpScope,
+    workspacePath: string,
+    servers: Record<string, unknown>,
+  ): Promise<void> {
+    const { filePath } = await resolveOpenCodeConfigPath(scope, workspacePath);
+    const config = await readOpenCodeConfig(filePath);
+    config.mcp = servers;
+    await writeOpenCodeConfig(filePath, config);
+  }
+
+  protected buildServerConfig(input: UpsertProviderMcpServerInput): Record<string, unknown> {
+    if (input.transport === 'stdio') {
+      if (!input.command?.trim()) {
+        throw new AppError('command is required for stdio MCP servers.', {
+          code: 'MCP_COMMAND_REQUIRED',
+          statusCode: 400,
+        });
+      }
+
+      return {
+        type: 'local',
+        command: [input.command, ...(input.args ?? [])],
+        enabled: true,
+        environment: input.env ?? {},
+      };
+    }
+
+    if (!input.url?.trim()) {
+      throw new AppError('url is required for http MCP servers.', {
+        code: 'MCP_URL_REQUIRED',
+        statusCode: 400,
+      });
+    }
+
+    return {
+      type: 'remote',
+      url: input.url,
+      enabled: true,
+      headers: input.headers ?? {},
+    };
+  }
+
+  protected normalizeServerConfig(
+    scope: McpScope,
+    name: string,
+    rawConfig: unknown,
+  ): ProviderMcpServer | null {
+    const config = readObjectRecord(rawConfig);
+    if (!config) {
+      return null;
+    }
+
+    if (config.type === 'local' || config.command !== undefined) {
+      const commandParts = typeof config.command === 'string'
+        ? [config.command, ...(readStringArray(config.args) ?? [])]
+        : readStringArray(config.command);
+      const command = commandParts?.[0];
+      if (!command) {
+        return null;
+      }
+
+      return {
+        provider: 'opencode',
+        name,
+        scope,
+        transport: 'stdio',
+        command,
+        args: commandParts.slice(1),
+        env: readStringRecord(config.environment) ?? readStringRecord(config.env),
+      };
+    }
+
+    if (config.type === 'remote' || typeof config.url === 'string') {
+      const url = readOptionalString(config.url);
+      if (!url) {
+        return null;
+      }
+
+      return {
+        provider: 'opencode',
+        name,
+        scope,
+        transport: 'http',
+        url,
+        headers: readStringRecord(config.headers),
+      };
+    }
+
+    return null;
+  }
+}
diff --git a/server/modules/providers/list/opencode/opencode-models.provider.ts b/server/modules/providers/list/opencode/opencode-models.provider.ts
new file mode 100644
index 00000000..0e5f7477
--- /dev/null
+++ b/server/modules/providers/list/opencode/opencode-models.provider.ts
@@ -0,0 +1,339 @@
+import { spawn } from 'node:child_process';
+
+import Database from 'better-sqlite3';
+import crossSpawn from 'cross-spawn';
+
+import type { IProviderModels } from '@/shared/interfaces.js';
+import type {
+  ProviderChangeActiveModelInput,
+  ProviderCurrentActiveModel,
+  ProviderModelOption,
+  ProviderModelsDefinition,
+  ProviderSessionActiveModelChange,
+} from '@/shared/types.js';
+import {
+  buildDefaultProviderCurrentActiveModel,
+  getOpenCodeDatabasePath,
+  readObjectRecord,
+  readOptionalString,
+  writeProviderSessionActiveModelChange,
+} from '@/shared/utils.js';
+
+export const OPENCODE_FALLBACK_MODELS: ProviderModelsDefinition = {
+  OPTIONS: [
+    {
+      value: 'anthropic/claude-sonnet-4-5',
+      label: 'Claude Sonnet 4.5',
+      description: 'anthropic - anthropic/claude-sonnet-4-5',
+    },
+    {
+      value: 'anthropic/claude-opus-4-1',
+      label: 'Claude Opus 4.1',
+      description: 'anthropic - anthropic/claude-opus-4-1',
+    },
+    {
+      value: 'anthropic/claude-haiku-4-5',
+      label: 'Claude Haiku 4.5',
+      description: 'anthropic - anthropic/claude-haiku-4-5',
+    },
+    {
+      value: 'openai/gpt-5.1',
+      label: 'GPT-5.1',
+      description: 'openai - openai/gpt-5.1',
+    },
+    {
+      value: 'openai/gpt-5.1-codex',
+      label: 'GPT-5.1 Codex',
+      description: 'openai - openai/gpt-5.1-codex',
+    },
+    {
+      value: 'openai/gpt-5.4-mini',
+      label: 'GPT-5.4 Mini',
+      description: 'openai - openai/gpt-5.4-mini',
+    },
+    {
+      value: 'google/gemini-2.5-pro',
+      label: 'Gemini 2.5 Pro',
+      description: 'google - google/gemini-2.5-pro',
+    },
+    {
+      value: 'google/gemini-2.5-flash',
+      label: 'Gemini 2.5 Flash',
+      description: 'google - google/gemini-2.5-flash',
+    },
+  ],
+  DEFAULT: 'anthropic/claude-sonnet-4-5',
+};
+
+const OPEN_CODE_MODELS_TIMEOUT_MS = 20_000;
+const MODEL_ID_LINE = /^[a-z0-9][a-z0-9._-]*\/[a-z0-9][a-z0-9._-]*$/i;
+const spawnFunction = process.platform === 'win32' ? crossSpawn : spawn;
+const DATE_TOKEN = /^\d{8}$/;
+const SIMPLE_NUMBER_TOKEN = /^\d$/;
+const VERSION_TOKEN = /^[a-z]\d+$/i;
+const NUMERIC_TOKEN = /^\d+(?:\.\d+)*$/;
+const SHORT_ACRONYM_TOKEN = /^[a-z]{2,3}$/;
+
+export const parseOpenCodeModelsStdout = (stdout: string): string[] => {
+  const ids: string[] = [];
+
+  for (const rawLine of stdout.split(/\r?\n/)) {
+    const line = rawLine.trim();
+    if (!line || line.startsWith('{') || line.startsWith('[')) {
+      continue;
+    }
+
+    if (MODEL_ID_LINE.test(line)) {
+      ids.push(line);
+    }
+  }
+
+  return [...new Set(ids)];
+};
+
+const formatDateToken = (token: string): string => (
+  `${token.slice(0, 4)}-${token.slice(4, 6)}-${token.slice(6, 8)}`
+);
+
+const formatModelToken = (token: string, nextToken?: string): string => {
+  const lower = token.toLowerCase();
+
+  if (VERSION_TOKEN.test(token)) {
+    return token.toUpperCase();
+  }
+
+  if (SHORT_ACRONYM_TOKEN.test(lower) && nextToken && NUMERIC_TOKEN.test(nextToken)) {
+    return token.toUpperCase();
+  }
+
+  return lower.charAt(0).toUpperCase() + lower.slice(1);
+};
+
+const formatOpenCodeModelSlug = (slug: string): string => {
+  const labelParts: string[] = [];
+  const dateParts: string[] = [];
+  const tokens = slug.split('-').filter(Boolean);
+
+  for (let index = 0; index < tokens.length; index += 1) {
+    const token = tokens[index];
+    const nextToken = tokens[index + 1];
+
+    if (DATE_TOKEN.test(token)) {
+      dateParts.push(formatDateToken(token));
+      continue;
+    }
+
+    if (SIMPLE_NUMBER_TOKEN.test(token) && nextToken && SIMPLE_NUMBER_TOKEN.test(nextToken)) {
+      labelParts.push(`${token}.${nextToken}`);
+      index += 1;
+      continue;
+    }
+
+    labelParts.push(formatModelToken(token, nextToken));
+  }
+
+  const label = (labelParts.join(' ').trim() || slug).replace(/^GPT\s+/, 'GPT-');
+  if (dateParts.length === 0) {
+    return label;
+  }
+
+  return `${label} (${dateParts.join(', ')})`;
+};
+
+const readOpenCodeModelParts = (id: string): { upstreamProvider: string; slug: string } => {
+  const separatorIndex = id.indexOf('/');
+  if (separatorIndex < 0) {
+    return {
+      upstreamProvider: '',
+      slug: id,
+    };
+  }
+
+  return {
+    upstreamProvider: id.slice(0, separatorIndex),
+    slug: id.slice(separatorIndex + 1),
+  };
+};
+
+const labelForOpenCodeModelId = (id: string): string => {
+  const fallbackLabel = OPENCODE_FALLBACK_MODELS.OPTIONS.find((option) => option.value === id)?.label;
+  if (fallbackLabel) {
+    return fallbackLabel;
+  }
+
+  const { slug } = readOpenCodeModelParts(id);
+  return formatOpenCodeModelSlug(slug);
+};
+
+const descriptionForOpenCodeModelId = (id: string): string => {
+  const { upstreamProvider } = readOpenCodeModelParts(id);
+  return upstreamProvider ? `${upstreamProvider} - ${id}` : id;
+};
+
+export const buildOpenCodeDefinitionFromIds = (ids: string[]): ProviderModelsDefinition => {
+  const options: ProviderModelOption[] = ids.map((value) => ({
+    value,
+    label: labelForOpenCodeModelId(value),
+    description: descriptionForOpenCodeModelId(value),
+  }));
+
+  const defaultValue = options.find((option) => option.value === OPENCODE_FALLBACK_MODELS.DEFAULT)?.value
+    ?? options[0]?.value
+    ?? OPENCODE_FALLBACK_MODELS.DEFAULT;
+
+  return {
+    OPTIONS: options,
+    DEFAULT: defaultValue,
+  };
+};
+
+const parseOpenCodeSessionModelValue = (rawModel: unknown): string | null => {
+  if (typeof rawModel === 'string') {
+    const trimmed = rawModel.trim();
+    if (!trimmed) {
+      return null;
+    }
+
+    try {
+      return parseOpenCodeSessionModelValue(JSON.parse(trimmed));
+    } catch {
+      return trimmed;
+    }
+  }
+
+  const record = readObjectRecord(rawModel);
+  if (!record) {
+    return null;
+  }
+
+  return readOptionalString(record.id)
+    ?? readOptionalString(record.model)
+    ?? readOptionalString(record.name)
+    ?? readOptionalString(record.value)
+    ?? null;
+};
+
+const runOpenCodeModelsCommand = (): Promise<string> => new Promise((resolve, reject) => {
+  const openCodeProcess = spawnFunction('opencode', ['models'], {
+    cwd: process.cwd(),
+    env: { ...process.env },
+  });
+
+  let stdout = '';
+  let stderr = '';
+  let settled = false;
+
+  const timer = setTimeout(() => {
+    openCodeProcess.kill('SIGTERM');
+    if (!settled) {
+      settled = true;
+      reject(new Error('opencode models timed out'));
+    }
+  }, OPEN_CODE_MODELS_TIMEOUT_MS);
+
+  const finish = (error: Error | null, output: string) => {
+    if (settled) {
+      return;
+    }
+
+    settled = true;
+    clearTimeout(timer);
+
+    if (error) {
+      reject(error);
+      return;
+    }
+
+    resolve(output);
+  };
+
+  openCodeProcess.stdout?.on('data', (chunk: Buffer) => {
+    stdout += chunk.toString();
+  });
+
+  openCodeProcess.stderr?.on('data', (chunk: Buffer) => {
+    stderr += chunk.toString();
+  });
+
+  openCodeProcess.on('error', (error) => {
+    finish(error instanceof Error ? error : new Error(String(error)), '');
+  });
+
+  openCodeProcess.on('close', (code) => {
+    if (code !== 0) {
+      finish(new Error(stderr.trim() || `opencode models exited with code ${code}`), '');
+      return;
+    }
+
+    finish(null, stdout);
+  });
+});
+
+export class OpenCodeProviderModels implements IProviderModels {
+  async getSupportedModels(): Promise<ProviderModelsDefinition> {
+    try {
+      const stdout = await runOpenCodeModelsCommand();
+      const ids = parseOpenCodeModelsStdout(stdout);
+      if (ids.length === 0) {
+        return OPENCODE_FALLBACK_MODELS;
+      }
+
+      return buildOpenCodeDefinitionFromIds(ids);
+    } catch {
+      return OPENCODE_FALLBACK_MODELS;
+    }
+  }
+
+  async getCurrentActiveModel(sessionId?: string): Promise<ProviderCurrentActiveModel> {
+    if (!sessionId?.trim()) {
+      return buildDefaultProviderCurrentActiveModel(await this.getSupportedModels());
+    }
+
+    try {
+      const dbPath = getOpenCodeDatabasePath();
+      const db = new Database(dbPath, { readonly: true, fileMustExist: true });
+
+      try {
+        const row = db.prepare(`
+          SELECT
+            s.id AS sessionId,
+            s.model AS model,
+            s.agent AS agent,
+            s.directory AS directory,
+            s.time_updated AS timeUpdated,
+            s.time_created AS timeCreated
+          FROM session s
+          WHERE s.id = ?
+          ORDER BY COALESCE(s.time_updated, s.time_created, 0) DESC
+          LIMIT 1
+        `).get(sessionId) as {
+          sessionId?: string;
+          model?: unknown;
+          agent?: string | null;
+          directory?: string | null;
+          timeUpdated?: number | null;
+          timeCreated?: number | null;
+        } | undefined;
+
+        const model = parseOpenCodeSessionModelValue(row?.model);
+        if (model) {
+          return {
+            model,
+          };
+        }
+      } finally {
+        db.close();
+      }
+    } catch {
+      // Fall through to the provider default when OpenCode session lookup fails.
+    }
+
+    return buildDefaultProviderCurrentActiveModel(await this.getSupportedModels());
+  }
+
+  async changeActiveModel(
+    input: ProviderChangeActiveModelInput,
+  ): Promise<ProviderSessionActiveModelChange> {
+    return writeProviderSessionActiveModelChange('opencode', input);
+  }
+}
diff --git a/server/modules/providers/list/opencode/opencode-session-synchronizer.provider.ts b/server/modules/providers/list/opencode/opencode-session-synchronizer.provider.ts
new file mode 100644
index 00000000..bd9ad9fe
--- /dev/null
+++ b/server/modules/providers/list/opencode/opencode-session-synchronizer.provider.ts
@@ -0,0 +1,157 @@
+import fsSync from 'node:fs';
+import path from 'node:path';
+
+import Database from 'better-sqlite3';
+
+import { sessionsDb } from '@/modules/database/index.js';
+import type { IProviderSessionSynchronizer } from '@/shared/interfaces.js';
+import {
+  getOpenCodeDatabasePath,
+  normalizeProviderTimestamp,
+  normalizeSessionName,
+  readJsonRecord,
+  readOptionalString,
+} from '@/shared/utils.js';
+
+type OpenCodeSessionRow = {
+  id: string;
+  directory: string | null;
+  title: string | null;
+  time_created: number | null;
+  time_updated: number | null;
+  worktree: string | null;
+};
+
+type SynchronizeRowsResult = {
+  processed: number;
+  firstSessionId: string | null;
+};
+
+/**
+ * Session indexer for OpenCode's SQLite-backed session store.
+ */
+export class OpenCodeSessionSynchronizer implements IProviderSessionSynchronizer {
+  private readonly provider = 'opencode' as const;
+
+  /**
+   * Scans OpenCode's shared opencode.db and upserts active sessions into DB.
+   */
+  async synchronize(since?: Date): Promise<number> {
+    const result = this.synchronizeRows(since);
+    return result.processed;
+  }
+
+  /**
+   * Handles watcher changes for opencode.db.
+   */
+  async synchronizeFile(filePath: string): Promise<string | null> {
+    if (path.basename(filePath) !== 'opencode.db') {
+      return null;
+    }
+
+    const result = this.synchronizeRows(undefined, 1);
+    return result.firstSessionId;
+  }
+
+  private synchronizeRows(since?: Date, limit?: number): SynchronizeRowsResult {
+    const dbPath = getOpenCodeDatabasePath();
+    if (!fsSync.existsSync(dbPath)) {
+      return { processed: 0, firstSessionId: null };
+    }
+
+    const db = new Database(dbPath, { readonly: true, fileMustExist: true });
+    try {
+      const sinceMillis = since?.getTime() ?? null;
+      const limitClause = limit ? 'LIMIT ?' : '';
+      const params = limit ? [sinceMillis, sinceMillis, limit] : [sinceMillis, sinceMillis];
+      const rows = db.prepare(`
+        SELECT
+          s.id AS id,
+          s.directory AS directory,
+          s.title AS title,
+          s.time_created AS time_created,
+          s.time_updated AS time_updated,
+          p.worktree AS worktree
+        FROM session s
+        LEFT JOIN project p ON p.id = s.project_id
+        WHERE s.time_archived IS NULL
+          AND (? IS NULL OR COALESCE(s.time_updated, s.time_created, 0) >= ?)
+        ORDER BY COALESCE(s.time_updated, s.time_created, 0) DESC, s.id DESC
+        ${limitClause}
+      `).all(...params) as OpenCodeSessionRow[];
+
+      let processed = 0;
+      let firstSessionId: string | null = null;
+      for (const row of rows) {
+        const indexedSessionId = this.upsertSession(db, row);
+        if (!indexedSessionId) {
+          continue;
+        }
+
+        if (!firstSessionId) {
+          firstSessionId = indexedSessionId;
+        }
+        processed += 1;
+      }
+
+      return { processed, firstSessionId };
+    } catch (error) {
+      const message = error instanceof Error ? error.message : String(error);
+      console.warn('[OpenCodeProvider] Failed to synchronize sessions:', message);
+      return { processed: 0, firstSessionId: null };
+    } finally {
+      db.close();
+    }
+  }
+
+  private upsertSession(db: Database.Database, row: OpenCodeSessionRow): string | null {
+    const sessionId = readOptionalString(row.id);
+    const projectPath = readOptionalString(row.directory) ?? readOptionalString(row.worktree);
+    if (!sessionId || !projectPath) {
+      return null;
+    }
+
+    const fallbackTitle = 'Untitled OpenCode Session';
+    const existingSession = sessionsDb.getSessionById(sessionId);
+    const existingName = existingSession?.custom_name;
+    const nextName = existingName && existingName !== fallbackTitle
+      ? existingName
+      : readOptionalString(row.title) ?? this.readFirstUserText(db, sessionId);
+
+    // OpenCode stores every session in one shared sqlite database, so jsonl_path
+    // must stay null to avoid deleting opencode.db when one app session is removed.
+    sessionsDb.createSession(
+      sessionId,
+      this.provider,
+      projectPath,
+      normalizeSessionName(nextName, fallbackTitle),
+      normalizeProviderTimestamp(row.time_created),
+      normalizeProviderTimestamp(row.time_updated ?? row.time_created),
+      null,
+    );
+
+    return sessionId;
+  }
+
+  private readFirstUserText(db: Database.Database, sessionId: string): string | undefined {
+    try {
+      const row = db.prepare(`
+        SELECT p.data AS data
+        FROM message m
+        INNER JOIN part p
+          ON p.session_id = m.session_id
+         AND p.message_id = m.id
+        WHERE m.session_id = ?
+          AND json_extract(m.data, '$.role') = 'user'
+          AND json_extract(p.data, '$.type') = 'text'
+        ORDER BY COALESCE(m.time_created, 0), COALESCE(p.time_created, 0)
+        LIMIT 1
+      `).get(sessionId) as { data: string | null } | undefined;
+
+      const data = readJsonRecord(row?.data);
+      return readOptionalString(data?.text);
+    } catch {
+      return undefined;
+    }
+  }
+}
diff --git a/server/modules/providers/list/opencode/opencode-sessions.provider.ts b/server/modules/providers/list/opencode/opencode-sessions.provider.ts
new file mode 100644
index 00000000..f5b8ba84
--- /dev/null
+++ b/server/modules/providers/list/opencode/opencode-sessions.provider.ts
@@ -0,0 +1,463 @@
+import fsSync from 'node:fs';
+
+import Database from 'better-sqlite3';
+
+import type { IProviderSessions } from '@/shared/interfaces.js';
+import type { AnyRecord, FetchHistoryOptions, FetchHistoryResult, NormalizedMessage } from '@/shared/types.js';
+import {
+  createNormalizedMessage,
+  generateMessageId,
+  getOpenCodeDatabasePath,
+  normalizeProviderTimestamp,
+  readObjectRecord,
+  readJsonRecord,
+  readOptionalString,
+} from '@/shared/utils.js';
+
+const PROVIDER = 'opencode';
+
+type OpenCodeHistoryRow = {
+  message_id: string;
+  message_time_created: number | null;
+  message_data: string | null;
+  part_id: string | null;
+  part_time_created: number | null;
+  part_data: string | null;
+};
+
+type OpenCodeTokenTotals = {
+  inputTokens: number;
+  outputTokens: number;
+  cacheReadTokens: number;
+  cacheCreationTokens: number;
+  reasoningTokens: number;
+};
+
+const openOpenCodeDatabase = (): Database.Database | null => {
+  const dbPath = getOpenCodeDatabasePath();
+  if (!fsSync.existsSync(dbPath)) {
+    return null;
+  }
+
+  return new Database(dbPath, { readonly: true, fileMustExist: true });
+};
+
+const formatToolContent = (value: unknown): string => {
+  if (value === undefined || value === null) {
+    return '';
+  }
+
+  if (typeof value === 'string') {
+    return value;
+  }
+
+  try {
+    return JSON.stringify(value, null, 2);
+  } catch {
+    return String(value);
+  }
+};
+
+/**
+ * OpenCode can persist the first prompt as a JSON string literal inside a text
+ * part, for example `"hello"` instead of `hello`. Decode only complete JSON
+ * string literals so normal assistant/user prose remains untouched.
+ */
+const unwrapJsonStringLiteral = (value: string): string => {
+  const trimmed = value.trim();
+  if (!trimmed.startsWith('"') || !trimmed.endsWith('"')) {
+    return value;
+  }
+
+  try {
+    const parsed = JSON.parse(trimmed);
+    return typeof parsed === 'string' ? parsed : value;
+  } catch {
+    return value;
+  }
+};
+
+const extractText = (value: unknown): string => {
+  if (typeof value === 'string') {
+    return unwrapJsonStringLiteral(value);
+  }
+
+  const record = readObjectRecord(value);
+  const text = readOptionalString(record?.text)
+    ?? readOptionalString(record?.content)
+    ?? '';
+  return unwrapJsonStringLiteral(text);
+};
+
+const hasUserRole = (value: unknown): boolean => {
+  const record = readObjectRecord(value);
+  return readOptionalString(record?.role) === 'user';
+};
+
+const isUserTextEcho = (raw: AnyRecord): boolean => {
+  return readOptionalString(raw.role) === 'user'
+    || hasUserRole(raw.message)
+    || hasUserRole(raw.part);
+};
+
+const buildTokenUsage = (totals: OpenCodeTokenTotals | undefined): AnyRecord | undefined => {
+  if (!totals) {
+    return undefined;
+  }
+
+  const inputTokens = totals.inputTokens;
+  const outputTokens = totals.outputTokens;
+  const cacheReadTokens = totals.cacheReadTokens;
+  const cacheCreationTokens = totals.cacheCreationTokens;
+  const reasoningTokens = totals.reasoningTokens;
+  const used = inputTokens + outputTokens + cacheReadTokens + cacheCreationTokens + reasoningTokens;
+
+  if (used <= 0) {
+    return undefined;
+  }
+
+  return {
+    used,
+    total: used,
+    inputTokens,
+    outputTokens,
+    cacheReadTokens,
+    cacheCreationTokens,
+  };
+};
+
+/**
+ * OpenCode stores per-message token counts on assistant `message.data` objects
+ * (see MessageV2.Assistant). Older DBs also had session-level counters; this
+ * matches current `opencode.db` layouts that only persist message JSON.
+ */
+const aggregateOpenCodeSessionTokenUsage = (
+  db: Database.Database,
+  sessionId: string,
+): AnyRecord | undefined => {
+  const rows = db.prepare('SELECT data FROM message WHERE session_id = ?').all(sessionId) as { data: string }[];
+
+  let inputTokens = 0;
+  let outputTokens = 0;
+  let cacheReadTokens = 0;
+  let cacheCreationTokens = 0;
+  let reasoningTokens = 0;
+
+  for (const row of rows) {
+    const info = readJsonRecord(row.data);
+    if (readOptionalString(info?.role) !== 'assistant') {
+      continue;
+    }
+
+    const tokens = readObjectRecord(info?.tokens);
+    if (!tokens) {
+      continue;
+    }
+
+    inputTokens += Number(tokens.input ?? 0);
+    outputTokens += Number(tokens.output ?? 0);
+    reasoningTokens += Number(tokens.reasoning ?? 0);
+    const cache = readObjectRecord(tokens.cache);
+    cacheReadTokens += Number(cache?.read ?? 0);
+    cacheCreationTokens += Number(cache?.write ?? 0);
+  }
+
+  return buildTokenUsage({
+    inputTokens,
+    outputTokens,
+    cacheReadTokens,
+    cacheCreationTokens,
+    reasoningTokens,
+  });
+};
+
+export class OpenCodeSessionsProvider implements IProviderSessions {
+  /**
+   * Normalizes live `opencode run --format json` events into frontend messages.
+   */
+  normalizeMessage(rawMessage: unknown, sessionId: string | null): NormalizedMessage[] {
+    const raw = readObjectRecord(rawMessage);
+    if (!raw) {
+      return [];
+    }
+
+    const type = readOptionalString(raw.type) ?? readOptionalString(raw.event);
+    const eventSessionId = readOptionalString(raw.sessionID) ?? readOptionalString(raw.sessionId) ?? sessionId;
+    const timestamp = normalizeProviderTimestamp(raw.time ?? raw.timestamp);
+    const baseId = readOptionalString(raw.id)
+      ?? readOptionalString(raw.messageID)
+      ?? generateMessageId('opencode');
+
+    if (type === 'text') {
+      // The client already renders an optimistic user bubble, so provider user
+      // echoes must not be streamed back as assistant text.
+      if (isUserTextEcho(raw)) {
+        return [];
+      }
+
+      const content = extractText(raw.text ?? raw.delta ?? raw.message);
+      if (!content.trim()) {
+        return [];
+      }
+
+      return [createNormalizedMessage({
+        id: baseId,
+        sessionId: eventSessionId,
+        timestamp,
+        provider: PROVIDER,
+        kind: 'stream_delta',
+        content,
+      })];
+    }
+
+    if (type === 'reasoning') {
+      const content = extractText(raw.text ?? raw.delta ?? raw.message);
+      if (!content.trim()) {
+        return [];
+      }
+
+      return [createNormalizedMessage({
+        id: baseId,
+        sessionId: eventSessionId,
+        timestamp,
+        provider: PROVIDER,
+        kind: 'thinking',
+        content,
+      })];
+    }
+
+    if (type === 'tool_use') {
+      const toolName = readOptionalString(raw.tool) ?? readOptionalString(raw.name) ?? 'Tool';
+      const toolId = readOptionalString(raw.callID) ?? readOptionalString(raw.toolCallId) ?? baseId;
+      const toolMessage = createNormalizedMessage({
+        id: baseId,
+        sessionId: eventSessionId,
+        timestamp,
+        provider: PROVIDER,
+        kind: 'tool_use',
+        toolName,
+        toolInput: raw.input ?? raw.arguments ?? {},
+        toolId,
+      });
+
+      if (raw.output !== undefined || raw.error !== undefined) {
+        toolMessage.toolResult = {
+          content: formatToolContent(raw.output ?? raw.error),
+          isError: raw.error !== undefined,
+        };
+      }
+
+      return [toolMessage];
+    }
+
+    if (type === 'error') {
+      return [createNormalizedMessage({
+        id: baseId,
+        sessionId: eventSessionId,
+        timestamp,
+        provider: PROVIDER,
+        kind: 'error',
+        content: readOptionalString(raw.error) ?? readOptionalString(raw.message) ?? 'Unknown OpenCode error',
+      })];
+    }
+
+    if (type === 'step_finish') {
+      return [createNormalizedMessage({
+        id: baseId,
+        sessionId: eventSessionId,
+        timestamp,
+        provider: PROVIDER,
+        kind: 'stream_end',
+      })];
+    }
+
+    return [];
+  }
+
+  /**
+   * Loads OpenCode history from the shared SQLite session database.
+   */
+  async fetchHistory(
+    sessionId: string,
+    options: FetchHistoryOptions = {},
+  ): Promise<FetchHistoryResult> {
+    const { limit = null, offset = 0 } = options;
+    const db = openOpenCodeDatabase();
+    if (!db) {
+      return { messages: [], total: 0, hasMore: false, offset: 0, limit: null };
+    }
+
+    try {
+      const rows = db.prepare(`
+        SELECT
+          m.id AS message_id,
+          m.time_created AS message_time_created,
+          m.data AS message_data,
+          p.id AS part_id,
+          p.time_created AS part_time_created,
+          p.data AS part_data
+        FROM message m
+        LEFT JOIN part p
+          ON p.session_id = m.session_id
+         AND p.message_id = m.id
+        WHERE m.session_id = ?
+        ORDER BY
+          COALESCE(m.time_created, 0),
+          m.id,
+          COALESCE(p.time_created, 0),
+          p.id
+      `).all(sessionId) as OpenCodeHistoryRow[];
+
+      const normalized = this.normalizeHistoryRows(rows, sessionId);
+      const tokenUsage = aggregateOpenCodeSessionTokenUsage(db, sessionId);
+
+      const normalizedOffset = Math.max(0, offset);
+      const normalizedLimit = limit === null ? null : Math.max(0, limit);
+      const total = normalized.length;
+      const messages = normalizedLimit === null
+        ? normalized
+        : normalized.slice(
+            Math.max(0, total - normalizedOffset - normalizedLimit),
+            Math.max(0, total - normalizedOffset),
+          );
+
+      return {
+        messages,
+        total,
+        hasMore: normalizedLimit === null
+          ? false
+          : Math.max(0, total - normalizedOffset - normalizedLimit) > 0,
+        offset: normalizedOffset,
+        limit: normalizedLimit,
+        tokenUsage,
+      };
+    } catch (error) {
+      const message = error instanceof Error ? error.message : String(error);
+      console.warn(`[OpenCodeProvider] Failed to load session ${sessionId}:`, message);
+      return { messages: [], total: 0, hasMore: false, offset: 0, limit: null };
+    } finally {
+      db.close();
+    }
+  }
+
+  private normalizeHistoryRows(rows: OpenCodeHistoryRow[], sessionId: string): NormalizedMessage[] {
+    const normalized: NormalizedMessage[] = [];
+    const emittedMessageErrors = new Set<string>();
+
+    for (const row of rows) {
+      const timestamp = normalizeProviderTimestamp(row.part_time_created ?? row.message_time_created);
+      const baseId = `${row.message_id}_${row.part_id ?? normalized.length}`;
+      const messageInfo = readJsonRecord(row.message_data);
+      const messageRole = readOptionalString(messageInfo?.role);
+
+      if (
+        messageInfo
+        && messageRole === 'assistant'
+        && messageInfo.error != null
+        && !emittedMessageErrors.has(row.message_id)
+      ) {
+        emittedMessageErrors.add(row.message_id);
+        normalized.push(createNormalizedMessage({
+          id: `${baseId}_error`,
+          sessionId,
+          timestamp,
+          provider: PROVIDER,
+          kind: 'error',
+          content: formatToolContent(messageInfo.error),
+        }));
+      }
+
+      if (!row.part_id) {
+        continue;
+      }
+
+      const partData = readJsonRecord(row.part_data) ?? {};
+      const partType = readOptionalString(partData.type);
+      if (!partType) {
+        continue;
+      }
+
+      if (partType === 'text') {
+        const content = extractText(partData);
+        if (content.trim()) {
+          normalized.push(createNormalizedMessage({
+            id: baseId,
+            sessionId,
+            timestamp,
+            provider: PROVIDER,
+            kind: 'text',
+            role: messageRole === 'user' ? 'user' : 'assistant',
+            content,
+          }));
+        }
+        continue;
+      }
+
+      if (partType === 'reasoning') {
+        const content = extractText(partData);
+        if (content.trim()) {
+          normalized.push(createNormalizedMessage({
+            id: baseId,
+            sessionId,
+            timestamp,
+            provider: PROVIDER,
+            kind: 'thinking',
+            content,
+          }));
+        }
+        continue;
+      }
+
+      if (partType === 'tool') {
+        const state = readObjectRecord(partData.state) ?? {};
+        const status = readOptionalString(state.status);
+        const toolMessage = createNormalizedMessage({
+          id: baseId,
+          sessionId,
+          timestamp,
+          provider: PROVIDER,
+          kind: 'tool_use',
+          toolName: readOptionalString(partData.tool) ?? 'Tool',
+          toolInput: state.input ?? partData.input ?? {},
+          toolId: readOptionalString(partData.callID) ?? row.part_id,
+        });
+
+        if (status === 'completed' || status === 'error') {
+          toolMessage.toolResult = {
+            content: formatToolContent(state.output ?? state.error),
+            isError: status === 'error',
+          };
+        }
+
+        normalized.push(toolMessage);
+        continue;
+      }
+
+      if (partType === 'step-finish') {
+        normalized.push(createNormalizedMessage({
+          id: baseId,
+          sessionId,
+          timestamp,
+          provider: PROVIDER,
+          kind: 'stream_end',
+        }));
+        continue;
+      }
+
+      if (partType === 'patch' || partType === 'agent') {
+        normalized.push(createNormalizedMessage({
+          id: baseId,
+          sessionId,
+          timestamp,
+          provider: PROVIDER,
+          kind: 'tool_use',
+          toolName: partType === 'patch' ? 'Patch' : 'Agent',
+          toolInput: partData,
+          toolId: row.part_id,
+        }));
+      }
+    }
+
+    return normalized;
+  }
+}
diff --git a/server/modules/providers/list/opencode/opencode-skills.provider.ts b/server/modules/providers/list/opencode/opencode-skills.provider.ts
new file mode 100644
index 00000000..599402ec
--- /dev/null
+++ b/server/modules/providers/list/opencode/opencode-skills.provider.ts
@@ -0,0 +1,78 @@
+import os from 'node:os';
+import path from 'node:path';
+
+import { SkillsProvider } from '@/modules/providers/shared/skills/skills.provider.js';
+import type { ProviderSkillSource } from '@/shared/types.js';
+import {
+  addUniqueProviderSkillSource,
+  findTopmostGitRoot,
+} from '@/shared/utils.js';
+
+const OPENCODE_PROJECT_SKILL_DIRS = [
+  ['.opencode', 'skills'],
+  ['.claude', 'skills'],
+  ['.agents', 'skills'],
+];
+
+const OPENCODE_USER_SKILL_DIRS = [
+  ['.config', 'opencode', 'skills'],
+  ['.claude', 'skills'],
+  ['.agents', 'skills'],
+];
+
+export class OpenCodeSkillsProvider extends SkillsProvider {
+  constructor() {
+    super('opencode');
+  }
+
+  protected async getSkillSources(workspacePath: string): Promise<ProviderSkillSource[]> {
+    const sources: ProviderSkillSource[] = [];
+    const seenRootDirs = new Set<string>();
+    const repoRoot = await findTopmostGitRoot(workspacePath);
+
+    for (const projectRoot of this.getProjectSearchRoots(workspacePath, repoRoot)) {
+      for (const skillDir of OPENCODE_PROJECT_SKILL_DIRS) {
+        // OpenCode intentionally reads Claude and Agents skill folders so users
+        // can reuse the same skill libraries across compatible coding agents.
+        addUniqueProviderSkillSource(sources, seenRootDirs, {
+          scope: 'project',
+          rootDir: path.join(projectRoot, ...skillDir),
+          commandPrefix: '/',
+        });
+      }
+    }
+
+    for (const skillDir of OPENCODE_USER_SKILL_DIRS) {
+      addUniqueProviderSkillSource(sources, seenRootDirs, {
+        scope: 'user',
+        rootDir: path.join(os.homedir(), ...skillDir),
+        commandPrefix: '/',
+      });
+    }
+
+    return sources;
+  }
+
+  private getProjectSearchRoots(workspacePath: string, repoRoot: string | null): string[] {
+    const roots: string[] = [];
+    const normalizedWorkspacePath = path.resolve(workspacePath);
+    const normalizedRepoRoot = repoRoot ? path.resolve(repoRoot) : null;
+    let currentPath = normalizedWorkspacePath;
+
+    while (true) {
+      roots.push(currentPath);
+      if (!normalizedRepoRoot || currentPath === normalizedRepoRoot) {
+        break;
+      }
+
+      const parentPath = path.dirname(currentPath);
+      if (parentPath === currentPath) {
+        break;
+      }
+
+      currentPath = parentPath;
+    }
+
+    return roots;
+  }
+}
diff --git a/server/modules/providers/list/opencode/opencode.provider.ts b/server/modules/providers/list/opencode/opencode.provider.ts
new file mode 100644
index 00000000..38f0efd1
--- /dev/null
+++ b/server/modules/providers/list/opencode/opencode.provider.ts
@@ -0,0 +1,27 @@
+import { OpenCodeProviderAuth } from '@/modules/providers/list/opencode/opencode-auth.provider.js';
+import { OpenCodeProviderModels } from '@/modules/providers/list/opencode/opencode-models.provider.js';
+import { OpenCodeMcpProvider } from '@/modules/providers/list/opencode/opencode-mcp.provider.js';
+import { OpenCodeSessionSynchronizer } from '@/modules/providers/list/opencode/opencode-session-synchronizer.provider.js';
+import { OpenCodeSessionsProvider } from '@/modules/providers/list/opencode/opencode-sessions.provider.js';
+import { OpenCodeSkillsProvider } from '@/modules/providers/list/opencode/opencode-skills.provider.js';
+import { AbstractProvider } from '@/modules/providers/shared/base/abstract.provider.js';
+import type {
+  IProviderAuth,
+  IProviderModels,
+  IProviderSessionSynchronizer,
+  IProviderSkills,
+  IProviderSessions,
+} from '@/shared/interfaces.js';
+
+export class OpenCodeProvider extends AbstractProvider {
+  readonly models: IProviderModels = new OpenCodeProviderModels();
+  readonly mcp = new OpenCodeMcpProvider();
+  readonly auth: IProviderAuth = new OpenCodeProviderAuth();
+  readonly skills: IProviderSkills = new OpenCodeSkillsProvider();
+  readonly sessions: IProviderSessions = new OpenCodeSessionsProvider();
+  readonly sessionSynchronizer: IProviderSessionSynchronizer = new OpenCodeSessionSynchronizer();
+
+  constructor() {
+    super('opencode');
+  }
+}
diff --git a/server/modules/providers/provider.registry.ts b/server/modules/providers/provider.registry.ts
index 2f959b22..a9f0d26b 100644
--- a/server/modules/providers/provider.registry.ts
+++ b/server/modules/providers/provider.registry.ts
@@ -2,6 +2,7 @@ import { ClaudeProvider } from '@/modules/providers/list/claude/claude.provider.
 import { CodexProvider } from '@/modules/providers/list/codex/codex.provider.js';
 import { CursorProvider } from '@/modules/providers/list/cursor/cursor.provider.js';
 import { GeminiProvider } from '@/modules/providers/list/gemini/gemini.provider.js';
+import { OpenCodeProvider } from '@/modules/providers/list/opencode/opencode.provider.js';
 import type { IProvider } from '@/shared/interfaces.js';
 import type { LLMProvider } from '@/shared/types.js';
 import { AppError } from '@/shared/utils.js';
@@ -11,6 +12,7 @@ const providers: Record<LLMProvider, IProvider> = {
   codex: new CodexProvider(),
   cursor: new CursorProvider(),
   gemini: new GeminiProvider(),
+  opencode: new OpenCodeProvider(),
 };
 
 /**
diff --git a/server/modules/providers/provider.routes.ts b/server/modules/providers/provider.routes.ts
index 819959c4..2604fcc8 100644
--- a/server/modules/providers/provider.routes.ts
+++ b/server/modules/providers/provider.routes.ts
@@ -2,10 +2,17 @@ import express, { type Request, type Response } from 'express';
 
 import { providerAuthService } from '@/modules/providers/services/provider-auth.service.js';
 import { providerMcpService } from '@/modules/providers/services/mcp.service.js';
+import { providerModelsService } from '@/modules/providers/services/provider-models.service.js';
 import { providerSkillsService } from '@/modules/providers/services/skills.service.js';
 import { sessionConversationsSearchService } from '@/modules/providers/services/session-conversations-search.service.js';
 import { sessionsService } from '@/modules/providers/services/sessions.service.js';
-import type { LLMProvider, McpScope, McpTransport, UpsertProviderMcpServerInput } from '@/shared/types.js';
+import type {
+  LLMProvider,
+  McpScope,
+  McpTransport,
+  ProviderChangeActiveModelInput,
+  UpsertProviderMcpServerInput,
+} from '@/shared/types.js';
 import { AppError, asyncHandler, createApiSuccessResponse } from '@/shared/utils.js';
 
 const router = express.Router();
@@ -173,7 +180,13 @@ const parseMcpUpsertPayload = (payload: unknown): UpsertProviderMcpServerInput =
 
 const parseProvider = (value: unknown): LLMProvider => {
   const normalized = normalizeProviderParam(value);
-  if (normalized === 'claude' || normalized === 'codex' || normalized === 'cursor' || normalized === 'gemini') {
+  if (
+    normalized === 'claude'
+    || normalized === 'codex'
+    || normalized === 'cursor'
+    || normalized === 'gemini'
+    || normalized === 'opencode'
+  ) {
     return normalized;
   }
 
@@ -239,6 +252,29 @@ const parseSessionSearchLimit = (value: unknown): number => {
   return Math.max(1, Math.min(parsed, 100));
 };
 
+const parseChangeActiveModelPayload = (payload: unknown): ProviderChangeActiveModelInput => {
+  if (!payload || typeof payload !== 'object') {
+    throw new AppError('Request body must be an object.', {
+      code: 'INVALID_REQUEST_BODY',
+      statusCode: 400,
+    });
+  }
+
+  const body = payload as Record<string, unknown>;
+  const model = readOptionalQueryString(body.model);
+  if (!model) {
+    throw new AppError('model is required.', {
+      code: 'MODEL_REQUIRED',
+      statusCode: 400,
+    });
+  }
+
+  return {
+    sessionId: '',
+    model,
+  };
+};
+
 router.get(
   '/:provider/auth/status',
   asyncHandler(async (req: Request, res: Response) => {
@@ -248,6 +284,30 @@ router.get(
   }),
 );
 
+router.get(
+  '/:provider/models',
+  asyncHandler(async (req: Request, res: Response) => {
+    const provider = parseProvider(req.params.provider);
+    const bypassCache = parseOptionalBooleanQuery(req.query.bypassCache, 'bypassCache') ?? false;
+    const result = await providerModelsService.getProviderModels(provider, { bypassCache });
+    res.json(createApiSuccessResponse({ provider, models: result.models, cache: result.cache }));
+  }),
+);
+
+router.post(
+  '/:provider/sessions/:sessionId/active-model',
+  asyncHandler(async (req: Request, res: Response) => {
+    const provider = parseProvider(req.params.provider);
+    const sessionId = parseSessionId(req.params.sessionId);
+    const payload = parseChangeActiveModelPayload(req.body);
+    const result = await providerModelsService.changeActiveModel(provider, {
+      ...payload,
+      sessionId,
+    });
+    res.json(createApiSuccessResponse(result));
+  }),
+);
+
 // ----------------- Skills routes -----------------
 router.get(
   '/:provider/skills',
diff --git a/server/modules/providers/services/provider-models.service.ts b/server/modules/providers/services/provider-models.service.ts
new file mode 100644
index 00000000..5cb62433
--- /dev/null
+++ b/server/modules/providers/services/provider-models.service.ts
@@ -0,0 +1,325 @@
+import { mkdir, readFile, writeFile } from 'node:fs/promises';
+import os from 'node:os';
+import path from 'node:path';
+
+import { providerRegistry } from '@/modules/providers/provider.registry.js';
+import type { IProvider } from '@/shared/interfaces.js';
+import type {
+  LLMProvider,
+  ProviderChangeActiveModelInput,
+  ProviderCurrentActiveModel,
+  ProviderModelsCacheInfo,
+  ProviderModelsDefinition,
+  ProviderModelsResult,
+  ProviderSessionActiveModelChange,
+} from '@/shared/types.js';
+import { readProviderSessionActiveModelChange } from '@/shared/utils.js';
+
+export const PROVIDER_MODELS_CACHE_TTL_MS = 3 * 24 * 60 * 60 * 1000;
+const PROVIDER_MODELS_CACHE_VERSION = 1;
+
+type ProviderModelsServiceDependencies = {
+  resolveProvider?: (provider: LLMProvider) => Pick<IProvider, 'models'>;
+  cachePath?: string;
+  activeModelChangesPath?: string;
+  now?: () => number;
+};
+
+type ProviderModelsOptions = {
+  bypassCache?: boolean;
+};
+
+type ProviderModelsCacheEntry = {
+  updatedAt: number;
+  expiresAt: number;
+  models: ProviderModelsDefinition;
+};
+
+type ProviderModelsCacheFile = {
+  version: number;
+  entries: Record<string, ProviderModelsCacheEntry>;
+};
+
+const getProviderModelsCachePath = (): string => path.join(
+  os.homedir(),
+  '.cloudcli',
+  'provider-models-cache.json',
+);
+
+const toProviderModelsCacheInfo = (
+  entry: ProviderModelsCacheEntry,
+  source: ProviderModelsCacheInfo['source'],
+): ProviderModelsCacheInfo => ({
+  updatedAt: new Date(entry.updatedAt).toISOString(),
+  expiresAt: new Date(entry.expiresAt).toISOString(),
+  source,
+});
+
+const isProviderModelOption = (
+  value: unknown,
+): value is ProviderModelsDefinition['OPTIONS'][number] => (
+  Boolean(value)
+  && typeof value === 'object'
+  && typeof (value as ProviderModelsDefinition['OPTIONS'][number]).value === 'string'
+  && typeof (value as ProviderModelsDefinition['OPTIONS'][number]).label === 'string'
+  && (
+    typeof (value as ProviderModelsDefinition['OPTIONS'][number]).description === 'undefined'
+    || typeof (value as ProviderModelsDefinition['OPTIONS'][number]).description === 'string'
+  )
+);
+
+const isProviderModelsDefinition = (value: unknown): value is ProviderModelsDefinition => (
+  Boolean(value)
+  && typeof value === 'object'
+  && Array.isArray((value as ProviderModelsDefinition).OPTIONS)
+  && (value as ProviderModelsDefinition).OPTIONS.every(isProviderModelOption)
+  && typeof (value as ProviderModelsDefinition).DEFAULT === 'string'
+);
+
+const isProviderModelsCacheEntry = (value: unknown): value is ProviderModelsCacheEntry => (
+  Boolean(value)
+  && typeof value === 'object'
+  && typeof (value as ProviderModelsCacheEntry).updatedAt === 'number'
+  && typeof (value as ProviderModelsCacheEntry).expiresAt === 'number'
+  && isProviderModelsDefinition((value as ProviderModelsCacheEntry).models)
+);
+
+const readProviderModelsCacheFile = async (
+  cachePath: string,
+): Promise<ProviderModelsCacheFile | null> => {
+  try {
+    const raw = await readFile(cachePath, 'utf8');
+    const parsed = JSON.parse(raw) as Partial<ProviderModelsCacheFile>;
+    if (parsed.version !== PROVIDER_MODELS_CACHE_VERSION || !parsed.entries || typeof parsed.entries !== 'object') {
+      return null;
+    }
+
+    const entries = Object.fromEntries(
+      Object.entries(parsed.entries).filter((entry): entry is [string, ProviderModelsCacheEntry] =>
+        isProviderModelsCacheEntry(entry[1]),
+      ),
+    );
+
+    return {
+      version: PROVIDER_MODELS_CACHE_VERSION,
+      entries,
+    };
+  } catch {
+    return null;
+  }
+};
+
+const writeProviderModelsCacheFile = async (
+  cachePath: string,
+  entries: Map<LLMProvider, ProviderModelsCacheEntry>,
+  now: number,
+): Promise<void> => {
+  const serializableEntries = Object.fromEntries(
+    [...entries.entries()].filter(([, entry]) => entry.expiresAt > now),
+  );
+  const payload: ProviderModelsCacheFile = {
+    version: PROVIDER_MODELS_CACHE_VERSION,
+    entries: serializableEntries,
+  };
+
+  await mkdir(path.dirname(cachePath), { recursive: true });
+  await writeFile(cachePath, `${JSON.stringify(payload, null, 2)}\n`, 'utf8');
+};
+
+/**
+ * Provider model lookup service.
+ *
+ * Routes and other service callers use this layer instead of resolving provider
+ * classes directly so the provider-registry dependency stays centralized in one
+ * place.
+ */
+export const createProviderModelsService = (dependencies: ProviderModelsServiceDependencies = {}) => {
+  const resolveProvider = dependencies.resolveProvider ?? providerRegistry.resolveProvider;
+  const cachePath = dependencies.cachePath ?? getProviderModelsCachePath();
+  const activeModelChangesPath = dependencies.activeModelChangesPath;
+  const now = dependencies.now ?? (() => Date.now());
+  const memoryCache = new Map<LLMProvider, ProviderModelsCacheEntry>();
+  const pendingRequests = new Map<LLMProvider, Promise<ProviderModelsResult>>();
+  let persistedCacheLoaded = false;
+  let persistedCacheLoadPromise: Promise<void> | null = null;
+
+  const pruneExpiredMemoryEntry = (
+    provider: LLMProvider,
+    currentTime: number,
+    source: ProviderModelsCacheInfo['source'],
+  ): ProviderModelsResult | null => {
+    const cachedEntry = memoryCache.get(provider);
+    if (!cachedEntry) {
+      return null;
+    }
+
+    if (cachedEntry.expiresAt > currentTime) {
+      return {
+        models: cachedEntry.models,
+        cache: toProviderModelsCacheInfo(cachedEntry, source),
+      };
+    }
+
+    memoryCache.delete(provider);
+    return null;
+  };
+
+  const loadPersistedCache = async (): Promise<void> => {
+    if (persistedCacheLoaded) {
+      return;
+    }
+
+    if (!persistedCacheLoadPromise) {
+      persistedCacheLoadPromise = (async () => {
+        const cacheFile = await readProviderModelsCacheFile(cachePath);
+        const currentTime = now();
+
+        for (const [provider, entry] of Object.entries(cacheFile?.entries ?? {})) {
+          if (entry.expiresAt > currentTime) {
+            memoryCache.set(provider as LLMProvider, entry);
+          }
+        }
+
+        persistedCacheLoaded = true;
+      })().finally(() => {
+        persistedCacheLoadPromise = null;
+      });
+    }
+
+    await persistedCacheLoadPromise;
+  };
+
+  const persistCache = async (): Promise<void> => {
+    try {
+      await writeProviderModelsCacheFile(cachePath, memoryCache, now());
+    } catch (error) {
+      console.warn('Unable to persist provider models cache:', error);
+    }
+  };
+
+  const setCacheEntry = async (
+    provider: LLMProvider,
+    models: ProviderModelsDefinition,
+  ): Promise<ProviderModelsCacheEntry> => {
+    const currentTime = now();
+    const entry: ProviderModelsCacheEntry = {
+      updatedAt: currentTime,
+      expiresAt: currentTime + PROVIDER_MODELS_CACHE_TTL_MS,
+      models,
+    };
+
+    memoryCache.set(provider, entry);
+    await persistCache();
+    return entry;
+  };
+
+  const loadAndCacheModels = (
+    provider: LLMProvider,
+  ): Promise<ProviderModelsResult> => {
+    const request = resolveProvider(provider).models.getSupportedModels()
+      .then(async (models) => {
+        const entry = await setCacheEntry(provider, models);
+        return {
+          models,
+          cache: toProviderModelsCacheInfo(entry, 'fresh'),
+        };
+      })
+      .finally(() => {
+        pendingRequests.delete(provider);
+      });
+
+    pendingRequests.set(provider, request);
+    return request;
+  };
+
+  const getProviderModels = async (
+    provider: LLMProvider,
+    options: ProviderModelsOptions = {},
+  ): Promise<ProviderModelsResult> => {
+    if (options.bypassCache) {
+      const pendingRequest = pendingRequests.get(provider);
+      if (pendingRequest) {
+        return pendingRequest;
+      }
+
+      return loadAndCacheModels(provider);
+    }
+
+    const cachedModels = pruneExpiredMemoryEntry(provider, now(), 'memory');
+    if (cachedModels) {
+      return cachedModels;
+    }
+
+    const pendingRequest = pendingRequests.get(provider);
+    if (pendingRequest) {
+      return pendingRequest;
+    }
+
+    await loadPersistedCache();
+
+    const persistedModels = pruneExpiredMemoryEntry(provider, now(), 'disk');
+    if (persistedModels) {
+      return persistedModels;
+    }
+
+    const postLoadPendingRequest = pendingRequests.get(provider);
+    if (postLoadPendingRequest) {
+      return postLoadPendingRequest;
+    }
+
+    return loadAndCacheModels(provider);
+  };
+
+  const getCurrentActiveModel = async (
+    provider: LLMProvider,
+    sessionId?: string,
+  ): Promise<ProviderCurrentActiveModel> => resolveProvider(provider).models.getCurrentActiveModel(sessionId);
+
+  const changeActiveModel = async (
+    provider: LLMProvider,
+    input: ProviderChangeActiveModelInput,
+  ): Promise<ProviderSessionActiveModelChange> => resolveProvider(provider).models.changeActiveModel(input);
+
+  const getChangedActiveModel = async (
+    provider: LLMProvider,
+    sessionId: string,
+  ): Promise<ProviderSessionActiveModelChange> => readProviderSessionActiveModelChange(provider, sessionId, {
+    filePath: activeModelChangesPath,
+  });
+
+  const resolveResumeModel = async (
+    provider: LLMProvider,
+    sessionId: string | undefined,
+    requestedModel?: string | null,
+  ): Promise<string | undefined> => {
+    const normalizedRequestedModel = typeof requestedModel === 'string' ? requestedModel.trim() : '';
+    if (!sessionId?.trim()) {
+      return normalizedRequestedModel || undefined;
+    }
+
+    const changedModel = await getChangedActiveModel(provider, sessionId);
+    if (changedModel.supported && changedModel.changed && changedModel.model?.trim()) {
+      return changedModel.model.trim();
+    }
+
+    return normalizedRequestedModel || undefined;
+  };
+
+  const clearCache = (): void => {
+    memoryCache.clear();
+    pendingRequests.clear();
+    persistedCacheLoaded = false;
+    persistedCacheLoadPromise = null;
+  };
+
+  return {
+    getProviderModels,
+    getCurrentActiveModel,
+    getChangedActiveModel,
+    changeActiveModel,
+    resolveResumeModel,
+    clearCache,
+  };
+};
+
+export const providerModelsService = createProviderModelsService();
diff --git a/server/modules/providers/services/session-synchronizer.service.ts b/server/modules/providers/services/session-synchronizer.service.ts
index 47c37091..55b41f9e 100644
--- a/server/modules/providers/services/session-synchronizer.service.ts
+++ b/server/modules/providers/services/session-synchronizer.service.ts
@@ -22,6 +22,7 @@ export const sessionSynchronizerService = {
       codex: 0,
       cursor: 0,
       gemini: 0,
+      opencode: 0,
     };
     const failures: string[] = [];
 
diff --git a/server/modules/providers/services/sessions-watcher.service.ts b/server/modules/providers/services/sessions-watcher.service.ts
index 7a36e599..7e0ab36a 100644
--- a/server/modules/providers/services/sessions-watcher.service.ts
+++ b/server/modules/providers/services/sessions-watcher.service.ts
@@ -34,6 +34,10 @@ const PROVIDER_WATCH_PATHS: Array<{ provider: LLMProvider; rootPath: string }> =
     provider: 'gemini',
     rootPath: path.join(os.homedir(), '.gemini', 'tmp'),
   },
+  {
+    provider: 'opencode',
+    rootPath: path.join(os.homedir(), '.local', 'share', 'opencode'),
+  },
 ];
 
 const WATCHER_IGNORED_PATTERNS = [
@@ -67,6 +71,10 @@ let watcherRescheduleAfterRefresh = false;
  * Filters watcher events to provider-specific session artifact file types.
  */
 function isWatcherTargetFile(provider: LLMProvider, filePath: string): boolean {
+  if (provider === 'opencode') {
+    return path.basename(filePath) === 'opencode.db';
+  }
+
   if (provider === 'gemini') {
     return filePath.endsWith('.json') || filePath.endsWith('.jsonl');
   }
diff --git a/server/modules/providers/shared/base/abstract.provider.ts b/server/modules/providers/shared/base/abstract.provider.ts
index 03701d3e..56054e14 100644
--- a/server/modules/providers/shared/base/abstract.provider.ts
+++ b/server/modules/providers/shared/base/abstract.provider.ts
@@ -2,6 +2,7 @@ import type {
   IProvider,
   IProviderAuth,
   IProviderMcp,
+  IProviderModels,
   IProviderSessionSynchronizer,
   IProviderSkills,
   IProviderSessions,
@@ -17,6 +18,7 @@ import type { LLMProvider } from '@/shared/types.js';
  */
 export abstract class AbstractProvider implements IProvider {
   readonly id: LLMProvider;
+  abstract readonly models: IProviderModels;
   abstract readonly mcp: IProviderMcp;
   abstract readonly auth: IProviderAuth;
   abstract readonly skills: IProviderSkills;
diff --git a/server/modules/providers/tests/mcp.test.ts b/server/modules/providers/tests/mcp.test.ts
index a64914d6..494c8122 100644
--- a/server/modules/providers/tests/mcp.test.ts
+++ b/server/modules/providers/tests/mcp.test.ts
@@ -169,6 +169,93 @@ test('providerMcpService handles codex MCP TOML config and capability validation
   }
 });
 
+/**
+ * This test covers OpenCode MCP support for user/project config files, JSONC-compatible
+ * reads, and validation for unsupported scope/transport combinations.
+ */
+test('providerMcpService handles opencode MCP config and capability validation', { concurrency: false }, async () => {
+  const tempRoot = await fs.mkdtemp(path.join(os.tmpdir(), 'llm-mcp-opencode-'));
+  const workspacePath = path.join(tempRoot, 'workspace');
+  await fs.mkdir(workspacePath, { recursive: true });
+  await fs.mkdir(path.join(tempRoot, '.config', 'opencode'), { recursive: true });
+  await fs.writeFile(
+    path.join(tempRoot, '.config', 'opencode', 'opencode.jsonc'),
+    `{
+      // Existing comments should not block OpenCode MCP reads.
+      "mcp": {}
+    }\n`,
+    'utf8',
+  );
+
+  const restoreHomeDir = patchHomeDir(tempRoot);
+  try {
+    await providerMcpService.upsertProviderMcpServer('opencode', {
+      name: 'opencode-user-stdio',
+      scope: 'user',
+      transport: 'stdio',
+      command: 'node',
+      args: ['server.js'],
+      env: { API_KEY: 'x' },
+    });
+
+    await providerMcpService.upsertProviderMcpServer('opencode', {
+      name: 'opencode-project-http',
+      scope: 'project',
+      transport: 'http',
+      url: 'https://opencode.example.com/mcp',
+      headers: { Authorization: 'Bearer token' },
+      workspacePath,
+    });
+
+    const userConfig = await readJson(path.join(tempRoot, '.config', 'opencode', 'opencode.jsonc'));
+    const userServers = userConfig.mcp as Record<string, unknown>;
+    const userStdio = userServers['opencode-user-stdio'] as Record<string, unknown>;
+    assert.equal(userStdio.type, 'local');
+    assert.deepEqual(userStdio.command, ['node', 'server.js']);
+    assert.deepEqual(userStdio.environment, { API_KEY: 'x' });
+
+    const projectConfig = await readJson(path.join(workspacePath, 'opencode.json'));
+    const projectServers = projectConfig.mcp as Record<string, unknown>;
+    const projectHttp = projectServers['opencode-project-http'] as Record<string, unknown>;
+    assert.equal(projectHttp.type, 'remote');
+    assert.equal(projectHttp.url, 'https://opencode.example.com/mcp');
+
+    const grouped = await providerMcpService.listProviderMcpServers('opencode', { workspacePath });
+    assert.ok(grouped.user.some((server) => server.name === 'opencode-user-stdio' && server.transport === 'stdio'));
+    assert.ok(grouped.project.some((server) => server.name === 'opencode-project-http' && server.transport === 'http'));
+
+    await assert.rejects(
+      providerMcpService.upsertProviderMcpServer('opencode', {
+        name: 'opencode-local',
+        scope: 'local',
+        transport: 'stdio',
+        command: 'node',
+      }),
+      (error: unknown) =>
+        error instanceof AppError &&
+        error.code === 'MCP_SCOPE_NOT_SUPPORTED' &&
+        error.statusCode === 400,
+    );
+
+    await assert.rejects(
+      providerMcpService.upsertProviderMcpServer('opencode', {
+        name: 'opencode-sse',
+        scope: 'project',
+        transport: 'sse',
+        url: 'https://example.com/sse',
+        workspacePath,
+      }),
+      (error: unknown) =>
+        error instanceof AppError &&
+        error.code === 'MCP_TRANSPORT_NOT_SUPPORTED' &&
+        error.statusCode === 400,
+    );
+  } finally {
+    restoreHomeDir();
+    await fs.rm(tempRoot, { recursive: true, force: true });
+  }
+});
+
 /**
  * This test covers Gemini/Cursor MCP JSON formats and user/project scope persistence.
  */
@@ -255,7 +342,7 @@ test('providerMcpService global adder writes to all providers and rejects unsupp
     });
 
     const expectCursorGlobal = process.platform !== 'win32';
-    assert.equal(globalResult.length, expectCursorGlobal ? 4 : 3);
+    assert.equal(globalResult.length, expectCursorGlobal ? 5 : 4);
     assert.ok(globalResult.every((entry) => entry.created === true));
 
     const claudeProject = await readJson(path.join(workspacePath, '.mcp.json'));
@@ -267,6 +354,9 @@ test('providerMcpService global adder writes to all providers and rejects unsupp
     const geminiProject = await readJson(path.join(workspacePath, '.gemini', 'settings.json'));
     assert.ok((geminiProject.mcpServers as Record<string, unknown>)['global-http']);
 
+    const opencodeProject = await readJson(path.join(workspacePath, 'opencode.json'));
+    assert.ok((opencodeProject.mcp as Record<string, unknown>)['global-http']);
+
     if (expectCursorGlobal) {
       const cursorProject = await readJson(path.join(workspacePath, '.cursor', 'mcp.json'));
       assert.ok((cursorProject.mcpServers as Record<string, unknown>)['global-http']);
diff --git a/server/modules/providers/tests/opencode-models.test.ts b/server/modules/providers/tests/opencode-models.test.ts
new file mode 100644
index 00000000..c28ac0ef
--- /dev/null
+++ b/server/modules/providers/tests/opencode-models.test.ts
@@ -0,0 +1,73 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+
+import {
+  buildOpenCodeDefinitionFromIds,
+  parseOpenCodeModelsStdout,
+} from '@/modules/providers/list/opencode/opencode-models.provider.js';
+
+test('OpenCode models provider parses plain CLI output and removes duplicates', () => {
+  const ids = parseOpenCodeModelsStdout(`
+opencode/big-pickle
+not a model
+anthropic/claude-opus-4-7-fast
+anthropic/claude-opus-4-7-fast
+openai/gpt-5.5-pro
+`);
+
+  assert.deepEqual(ids, [
+    'opencode/big-pickle',
+    'anthropic/claude-opus-4-7-fast',
+    'openai/gpt-5.5-pro',
+  ]);
+});
+
+test('OpenCode models provider formats frontend labels from provider-prefixed ids', () => {
+  const definition = buildOpenCodeDefinitionFromIds([
+    'opencode/deepseek-v4-flash-free',
+    'opencode/nemotron-3-super-free',
+    'anthropic/claude-3-5-sonnet-20241022',
+    'anthropic/claude-opus-4-7-fast',
+    'openai/gpt-5.4-mini-fast',
+    'openai/gpt-5.5-pro',
+    'newprovider/alpha-v12-special-20261231',
+  ]);
+
+  assert.deepEqual(definition.OPTIONS, [
+    {
+      value: 'opencode/deepseek-v4-flash-free',
+      label: 'Deepseek V4 Flash Free',
+      description: 'opencode - opencode/deepseek-v4-flash-free',
+    },
+    {
+      value: 'opencode/nemotron-3-super-free',
+      label: 'Nemotron 3 Super Free',
+      description: 'opencode - opencode/nemotron-3-super-free',
+    },
+    {
+      value: 'anthropic/claude-3-5-sonnet-20241022',
+      label: 'Claude 3.5 Sonnet (2024-10-22)',
+      description: 'anthropic - anthropic/claude-3-5-sonnet-20241022',
+    },
+    {
+      value: 'anthropic/claude-opus-4-7-fast',
+      label: 'Claude Opus 4.7 Fast',
+      description: 'anthropic - anthropic/claude-opus-4-7-fast',
+    },
+    {
+      value: 'openai/gpt-5.4-mini-fast',
+      label: 'GPT-5.4 Mini Fast',
+      description: 'openai - openai/gpt-5.4-mini-fast',
+    },
+    {
+      value: 'openai/gpt-5.5-pro',
+      label: 'GPT-5.5 Pro',
+      description: 'openai - openai/gpt-5.5-pro',
+    },
+    {
+      value: 'newprovider/alpha-v12-special-20261231',
+      label: 'Alpha V12 Special (2026-12-31)',
+      description: 'newprovider - newprovider/alpha-v12-special-20261231',
+    },
+  ]);
+});
diff --git a/server/modules/providers/tests/opencode-sessions.test.ts b/server/modules/providers/tests/opencode-sessions.test.ts
new file mode 100644
index 00000000..139a28aa
--- /dev/null
+++ b/server/modules/providers/tests/opencode-sessions.test.ts
@@ -0,0 +1,321 @@
+import assert from 'node:assert/strict';
+import { mkdir, mkdtemp, rm } from 'node:fs/promises';
+import os from 'node:os';
+import path from 'node:path';
+import test from 'node:test';
+
+import Database from 'better-sqlite3';
+
+import { closeConnection, initializeDatabase, sessionsDb } from '@/modules/database/index.js';
+import { OpenCodeSessionSynchronizer } from '@/modules/providers/list/opencode/opencode-session-synchronizer.provider.js';
+import { OpenCodeSessionsProvider } from '@/modules/providers/list/opencode/opencode-sessions.provider.js';
+
+const patchHomeDir = (nextHomeDir: string) => {
+  const original = os.homedir;
+  (os as any).homedir = () => nextHomeDir;
+  return () => {
+    (os as any).homedir = original;
+  };
+};
+
+async function withIsolatedDatabase(runTest: () => void | Promise<void>): Promise<void> {
+  const previousDatabasePath = process.env.DATABASE_PATH;
+  const tempDirectory = await mkdtemp(path.join(os.tmpdir(), 'opencode-provider-db-'));
+  const databasePath = path.join(tempDirectory, 'auth.db');
+
+  closeConnection();
+  process.env.DATABASE_PATH = databasePath;
+  await initializeDatabase();
+
+  try {
+    await runTest();
+  } finally {
+    closeConnection();
+    if (previousDatabasePath === undefined) {
+      delete process.env.DATABASE_PATH;
+    } else {
+      process.env.DATABASE_PATH = previousDatabasePath;
+    }
+    await rm(tempDirectory, { recursive: true, force: true });
+  }
+}
+
+const createOpenCodeDatabase = async (homeDir: string, workspacePath: string): Promise<void> => {
+  const dataDir = path.join(homeDir, '.local', 'share', 'opencode');
+  await mkdir(dataDir, { recursive: true });
+
+  const db = new Database(path.join(dataDir, 'opencode.db'));
+  try {
+    db.exec(`
+      CREATE TABLE project (
+        id TEXT PRIMARY KEY,
+        worktree TEXT NOT NULL,
+        vcs TEXT,
+        name TEXT,
+        icon_url TEXT,
+        icon_color TEXT,
+        time_created INTEGER NOT NULL,
+        time_updated INTEGER NOT NULL,
+        time_initialized INTEGER,
+        sandboxes TEXT NOT NULL,
+        commands TEXT,
+        icon_url_override TEXT
+      );
+
+      CREATE TABLE session (
+        id TEXT PRIMARY KEY,
+        project_id TEXT NOT NULL,
+        parent_id TEXT,
+        slug TEXT NOT NULL,
+        directory TEXT NOT NULL,
+        title TEXT NOT NULL,
+        version TEXT NOT NULL,
+        share_url TEXT,
+        summary_additions INTEGER,
+        summary_deletions INTEGER,
+        summary_files INTEGER,
+        summary_diffs TEXT,
+        revert TEXT,
+        permission TEXT,
+        time_created INTEGER NOT NULL,
+        time_updated INTEGER NOT NULL,
+        time_compacting INTEGER,
+        time_archived INTEGER,
+        workspace_id TEXT,
+        path TEXT,
+        agent TEXT,
+        model TEXT,
+        FOREIGN KEY (project_id) REFERENCES project(id) ON DELETE CASCADE
+      );
+
+      CREATE TABLE message (
+        id TEXT PRIMARY KEY,
+        session_id TEXT NOT NULL,
+        time_created INTEGER NOT NULL,
+        time_updated INTEGER NOT NULL,
+        data TEXT NOT NULL,
+        FOREIGN KEY (session_id) REFERENCES session(id) ON DELETE CASCADE
+      );
+
+      CREATE TABLE part (
+        id TEXT PRIMARY KEY,
+        message_id TEXT NOT NULL,
+        session_id TEXT NOT NULL,
+        time_created INTEGER NOT NULL,
+        time_updated INTEGER NOT NULL,
+        data TEXT NOT NULL,
+        FOREIGN KEY (message_id) REFERENCES message(id) ON DELETE CASCADE
+      );
+
+      CREATE INDEX part_session_idx ON part (session_id);
+      CREATE INDEX session_project_idx ON session (project_id);
+      CREATE INDEX message_session_time_created_id_idx ON message (session_id, time_created, id);
+      CREATE INDEX part_message_id_id_idx ON part (message_id, id);
+    `);
+
+    db.prepare(
+      'INSERT INTO project (id, worktree, time_created, time_updated, sandboxes) VALUES (?, ?, ?, ?, ?)',
+    ).run(
+      'project-1',
+      workspacePath,
+      1_700_000_000_000,
+      1_700_000_001_000,
+      '[]',
+    );
+    db.prepare(`
+      INSERT INTO session (
+        id, project_id, slug, directory, title, version, time_created, time_updated, time_archived
+      )
+      VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)
+    `).run(
+      'open-session-1',
+      'project-1',
+      'open-session-1',
+      workspacePath,
+      'OpenCode indexed title',
+      '0.0.0',
+      1_700_000_000_000,
+      1_700_000_004_000,
+      null,
+    );
+
+    const userMessageData = JSON.stringify({
+      role: 'user',
+      time: { created: 1_700_000_001_000 },
+      agent: 'test',
+      model: { providerID: 'anthropic', modelID: 'claude' },
+    });
+    const assistantMessageData = JSON.stringify({
+      role: 'assistant',
+      time: { created: 1_700_000_002_000, completed: 1_700_000_003_000 },
+      parentID: 'message-user',
+      modelID: 'anthropic/claude-sonnet-4-5',
+      providerID: 'anthropic',
+      mode: 'default',
+      agent: 'test',
+      path: { cwd: '.', root: '.' },
+      cost: 0.01,
+      tokens: {
+        input: 10,
+        output: 20,
+        reasoning: 0,
+        cache: { read: 3, write: 2 },
+      },
+    });
+
+    db.prepare(
+      'INSERT INTO message (id, session_id, time_created, time_updated, data) VALUES (?, ?, ?, ?, ?)',
+    ).run('message-user', 'open-session-1', 1_700_000_001_000, 1_700_000_001_500, userMessageData);
+    db.prepare(
+      'INSERT INTO message (id, session_id, time_created, time_updated, data) VALUES (?, ?, ?, ?, ?)',
+    ).run('message-assistant', 'open-session-1', 1_700_000_002_000, 1_700_000_003_000, assistantMessageData);
+
+    const insertPart = db.prepare(`
+      INSERT INTO part (id, message_id, session_id, time_created, time_updated, data)
+      VALUES (?, ?, ?, ?, ?, ?)
+    `);
+    insertPart.run(
+      'part-user-text',
+      'message-user',
+      'open-session-1',
+      1_700_000_001_000,
+      1_700_000_001_000,
+      JSON.stringify({
+        type: 'text',
+        text: JSON.stringify('Build the OpenCode integration.'),
+      }),
+    );
+    insertPart.run(
+      'part-reasoning',
+      'message-assistant',
+      'open-session-1',
+      1_700_000_002_000,
+      1_700_000_002_000,
+      JSON.stringify({
+        type: 'reasoning',
+        text: 'I will inspect the provider shape first.',
+        time: { start: 0, end: 1 },
+      }),
+    );
+    insertPart.run(
+      'part-assistant-text',
+      'message-assistant',
+      'open-session-1',
+      1_700_000_002_500,
+      1_700_000_002_500,
+      JSON.stringify({
+        type: 'text',
+        text: 'The provider is wired.',
+      }),
+    );
+    insertPart.run(
+      'part-tool',
+      'message-assistant',
+      'open-session-1',
+      1_700_000_003_000,
+      1_700_000_003_000,
+      JSON.stringify({
+        type: 'tool',
+        tool: 'bash',
+        callID: 'tool-call-1',
+        state: {
+          status: 'completed',
+          input: { command: 'npm test' },
+          output: 'ok',
+          title: 'bash',
+          metadata: {},
+          time: { start: 0, end: 1 },
+        },
+      }),
+    );
+  } finally {
+    db.close();
+  }
+};
+
+test('OpenCode session synchronizer indexes sqlite sessions without deletable transcript paths', { concurrency: false }, async () => {
+  const tempRoot = await mkdtemp(path.join(os.tmpdir(), 'opencode-session-sync-'));
+  const workspacePath = path.join(tempRoot, 'workspace');
+  await mkdir(workspacePath, { recursive: true });
+  const restoreHomeDir = patchHomeDir(tempRoot);
+
+  try {
+    await createOpenCodeDatabase(tempRoot, workspacePath);
+    await withIsolatedDatabase(() => {
+      const synchronizer = new OpenCodeSessionSynchronizer();
+      const processed = synchronizer.synchronize();
+
+      return Promise.resolve(processed).then((count) => {
+        assert.equal(count, 1);
+        const indexed = sessionsDb.getSessionById('open-session-1');
+        assert.equal(indexed?.provider, 'opencode');
+        assert.equal(indexed?.project_path, workspacePath);
+        assert.equal(indexed?.custom_name, 'OpenCode indexed title');
+        assert.equal(indexed?.jsonl_path, null);
+      });
+    });
+  } finally {
+    restoreHomeDir();
+    await rm(tempRoot, { recursive: true, force: true });
+  }
+});
+
+test('OpenCode sessions provider normalizes quoted live text and skips user echoes', () => {
+  const provider = new OpenCodeSessionsProvider();
+  const normalized = provider.normalizeMessage({
+    type: 'text',
+    sessionID: 'open-session-live',
+    text: JSON.stringify('hello bro'),
+  }, null);
+
+  assert.equal(normalized.length, 1);
+  assert.equal(normalized[0]?.kind, 'stream_delta');
+  assert.equal(normalized[0]?.content, 'hello bro');
+
+  const userEcho = provider.normalizeMessage({
+    type: 'text',
+    sessionID: 'open-session-live',
+    role: 'user',
+    text: 'hello bro',
+  }, null);
+
+  assert.deepEqual(userEcho, []);
+});
+
+test('OpenCode sessions provider reads sqlite history and token usage', { concurrency: false }, async () => {
+  const tempRoot = await mkdtemp(path.join(os.tmpdir(), 'opencode-session-history-'));
+  const workspacePath = path.join(tempRoot, 'workspace');
+  await mkdir(workspacePath, { recursive: true });
+  const restoreHomeDir = patchHomeDir(tempRoot);
+
+  try {
+    await createOpenCodeDatabase(tempRoot, workspacePath);
+    const provider = new OpenCodeSessionsProvider();
+    const history = await provider.fetchHistory('open-session-1');
+
+    assert.equal(history.total, 4);
+    assert.equal(history.messages[0]?.kind, 'text');
+    assert.equal(history.messages[0]?.role, 'user');
+    assert.equal(history.messages[0]?.content, 'Build the OpenCode integration.');
+    assert.equal(history.messages[1]?.kind, 'thinking');
+    assert.equal(history.messages[2]?.content, 'The provider is wired.');
+    assert.equal(history.messages[3]?.kind, 'tool_use');
+    assert.deepEqual(history.messages[3]?.toolResult, { content: 'ok', isError: false });
+    assert.deepEqual(history.tokenUsage, {
+      used: 35,
+      total: 35,
+      inputTokens: 10,
+      outputTokens: 20,
+      cacheReadTokens: 3,
+      cacheCreationTokens: 2,
+    });
+
+    const paged = await provider.fetchHistory('open-session-1', { limit: 2, offset: 0 });
+    assert.equal(paged.messages.length, 2);
+    assert.equal(paged.hasMore, true);
+    assert.equal(paged.messages[0]?.content, 'The provider is wired.');
+  } finally {
+    restoreHomeDir();
+    await rm(tempRoot, { recursive: true, force: true });
+  }
+});
diff --git a/server/modules/providers/tests/provider-models.service.test.ts b/server/modules/providers/tests/provider-models.service.test.ts
new file mode 100644
index 00000000..fb9ebf7d
--- /dev/null
+++ b/server/modules/providers/tests/provider-models.service.test.ts
@@ -0,0 +1,318 @@
+import assert from 'node:assert/strict';
+import { mkdtemp, rm } from 'node:fs/promises';
+import os from 'node:os';
+import path from 'node:path';
+import test from 'node:test';
+
+import {
+  createProviderModelsService,
+  PROVIDER_MODELS_CACHE_TTL_MS,
+} from '@/modules/providers/services/provider-models.service.js';
+import type {
+  ProviderChangeActiveModelInput,
+  LLMProvider,
+  ProviderCurrentActiveModel,
+  ProviderModelsDefinition,
+  ProviderSessionActiveModelChange,
+} from '@/shared/types.js';
+import { writeProviderSessionActiveModelChange } from '@/shared/utils.js';
+
+const createModels = (value: string): ProviderModelsDefinition => ({
+  OPTIONS: [{ value, label: value }],
+  DEFAULT: value,
+});
+
+const createCurrentActiveModel = (model: string): ProviderCurrentActiveModel => ({
+  model,
+});
+
+const createSessionActiveModelChange = (
+  provider: LLMProvider,
+  input: ProviderChangeActiveModelInput,
+): ProviderSessionActiveModelChange => ({
+  provider,
+  sessionId: input.sessionId,
+  supported: true,
+  changed: true,
+  model: input.model,
+});
+
+const createEphemeralCachePath = (): string => path.join(
+  os.tmpdir(),
+  `provider-model-cache-${process.pid}-${Date.now()}-${Math.random().toString(16).slice(2)}.json`,
+);
+
+test('provider models service delegates to the resolved provider model adapter', async () => {
+  const calls: LLMProvider[] = [];
+  const service = createProviderModelsService({
+    cachePath: createEphemeralCachePath(),
+    resolveProvider: (provider) => {
+      calls.push(provider);
+      return {
+        models: {
+          getSupportedModels: async () => createModels(`${provider}-models`),
+          getCurrentActiveModel: async () => createCurrentActiveModel(`${provider}-active`),
+          changeActiveModel: async (input) => createSessionActiveModelChange(provider, input),
+        },
+      };
+    },
+  });
+
+  const models = await service.getProviderModels('codex', { bypassCache: true });
+
+  assert.deepEqual(calls, ['codex']);
+  assert.equal(models.models.DEFAULT, 'codex-models');
+  assert.equal(models.cache.source, 'fresh');
+});
+
+test('provider models service returns each provider adapter result without rewriting it', async () => {
+  const expectedModels: ProviderModelsDefinition = {
+    OPTIONS: [
+      { value: 'cursor-a', label: 'Cursor A' },
+      { value: 'cursor-b', label: 'Cursor B' },
+    ],
+    DEFAULT: 'cursor-b',
+  };
+
+  const service = createProviderModelsService({
+    cachePath: createEphemeralCachePath(),
+    resolveProvider: () => ({
+      models: {
+        getSupportedModels: async () => expectedModels,
+        getCurrentActiveModel: async () => createCurrentActiveModel('cursor-active'),
+        changeActiveModel: async (input) => createSessionActiveModelChange('cursor', input),
+      },
+    }),
+  });
+
+  const models = await service.getProviderModels('cursor', { bypassCache: true });
+
+  assert.deepEqual(models.models, expectedModels);
+});
+
+test('provider models are cached for the three-day ttl', async () => {
+  const tempRoot = await mkdtemp(path.join(os.tmpdir(), 'provider-model-cache-ttl-'));
+  let currentTime = 1_000;
+  let loadCount = 0;
+
+  try {
+    const service = createProviderModelsService({
+      cachePath: path.join(tempRoot, 'models-cache.json'),
+      now: () => currentTime,
+      resolveProvider: (provider) => ({
+        models: {
+          getSupportedModels: async () => {
+            loadCount += 1;
+            return createModels(`${provider}-${loadCount}`);
+          },
+          getCurrentActiveModel: async () => createCurrentActiveModel(`${provider}-active`),
+          changeActiveModel: async (input) => createSessionActiveModelChange(provider, input),
+        },
+      }),
+    });
+
+    const first = await service.getProviderModels('codex');
+    const cached = await service.getProviderModels('codex');
+    assert.equal(loadCount, 1);
+    assert.equal(cached.models.DEFAULT, first.models.DEFAULT);
+    assert.equal(cached.cache.source, 'memory');
+
+    currentTime += PROVIDER_MODELS_CACHE_TTL_MS - 1;
+    await service.getProviderModels('codex');
+    assert.equal(loadCount, 1);
+
+    currentTime += 2;
+    const refreshed = await service.getProviderModels('codex');
+    assert.equal(loadCount, 2);
+    assert.equal(refreshed.models.DEFAULT, 'codex-2');
+  } finally {
+    await rm(tempRoot, { recursive: true, force: true });
+  }
+});
+
+test('provider model cache is persisted across service instances', async () => {
+  const tempRoot = await mkdtemp(path.join(os.tmpdir(), 'provider-model-cache-file-'));
+  const cachePath = path.join(tempRoot, 'models-cache.json');
+
+  try {
+    const writer = createProviderModelsService({
+      cachePath,
+      resolveProvider: () => ({
+        models: {
+          getSupportedModels: async () => createModels('gemini-cached'),
+          getCurrentActiveModel: async () => createCurrentActiveModel('gemini-active'),
+          changeActiveModel: async (input) => createSessionActiveModelChange('gemini', input),
+        },
+      }),
+    });
+    await writer.getProviderModels('gemini');
+
+    const reader = createProviderModelsService({
+      cachePath,
+      resolveProvider: () => ({
+        models: {
+          getSupportedModels: async () => {
+            throw new Error('loader should not be called for persisted cache hits');
+          },
+          getCurrentActiveModel: async () => createCurrentActiveModel('gemini-active'),
+          changeActiveModel: async (input) => createSessionActiveModelChange('gemini', input),
+        },
+      }),
+    });
+    const models = await reader.getProviderModels('gemini');
+    assert.equal(models.models.DEFAULT, 'gemini-cached');
+    assert.equal(models.cache.source, 'disk');
+  } finally {
+    await rm(tempRoot, { recursive: true, force: true });
+  }
+});
+
+test('concurrent provider model requests share one load operation', async () => {
+  const tempRoot = await mkdtemp(path.join(os.tmpdir(), 'provider-model-cache-pending-'));
+  let loadCount = 0;
+
+  try {
+    const service = createProviderModelsService({
+      cachePath: path.join(tempRoot, 'models-cache.json'),
+      resolveProvider: () => ({
+        models: {
+          getSupportedModels: async () => {
+            loadCount += 1;
+            await new Promise((resolve) => setTimeout(resolve, 20));
+            return createModels('claude-cached');
+          },
+          getCurrentActiveModel: async () => createCurrentActiveModel('claude-active'),
+          changeActiveModel: async (input) => createSessionActiveModelChange('claude', input),
+        },
+      }),
+    });
+
+    const [first, second] = await Promise.all([
+      service.getProviderModels('claude'),
+      service.getProviderModels('claude'),
+    ]);
+
+    assert.equal(loadCount, 1);
+    assert.equal(first.models.DEFAULT, 'claude-cached');
+    assert.equal(second.models.DEFAULT, 'claude-cached');
+  } finally {
+    await rm(tempRoot, { recursive: true, force: true });
+  }
+});
+
+test('bypassCache forces a fresh provider fetch and updates cache metadata', async () => {
+  const tempRoot = await mkdtemp(path.join(os.tmpdir(), 'provider-model-cache-refresh-'));
+  let currentTime = 1_000;
+  let loadCount = 0;
+
+  try {
+    const service = createProviderModelsService({
+      cachePath: path.join(tempRoot, 'models-cache.json'),
+      now: () => currentTime,
+      resolveProvider: (provider) => ({
+        models: {
+          getSupportedModels: async () => {
+            loadCount += 1;
+            return createModels(`${provider}-${loadCount}`);
+          },
+          getCurrentActiveModel: async () => createCurrentActiveModel(`${provider}-active-${loadCount}`),
+          changeActiveModel: async (input) => createSessionActiveModelChange(provider, input),
+        },
+      }),
+    });
+
+    const first = await service.getProviderModels('claude');
+    currentTime += 50;
+    const refreshed = await service.getProviderModels('claude', { bypassCache: true });
+
+    assert.equal(first.models.DEFAULT, 'claude-1');
+    assert.equal(refreshed.models.DEFAULT, 'claude-2');
+    assert.equal(refreshed.cache.source, 'fresh');
+    assert.notEqual(refreshed.cache.updatedAt, first.cache.updatedAt);
+    assert.equal(loadCount, 2);
+  } finally {
+    await rm(tempRoot, { recursive: true, force: true });
+  }
+});
+
+test('provider models service delegates current active model lookups to the provider adapter', async () => {
+  const calls: Array<{ provider: LLMProvider; sessionId?: string }> = [];
+  const service = createProviderModelsService({
+    resolveProvider: (provider) => ({
+      models: {
+        getSupportedModels: async () => createModels(`${provider}-models`),
+        getCurrentActiveModel: async (sessionId) => {
+          calls.push({ provider, sessionId });
+          return createCurrentActiveModel(`${provider}-${sessionId}`);
+        },
+        changeActiveModel: async (input) => createSessionActiveModelChange(provider, input),
+      },
+    }),
+  });
+
+  const activeModel = await service.getCurrentActiveModel('opencode', 'session-123');
+
+  assert.deepEqual(calls, [{ provider: 'opencode', sessionId: 'session-123' }]);
+  assert.equal(activeModel.model, 'opencode-session-123');
+});
+
+test('provider models service delegates active model change requests to the provider adapter', async () => {
+  const calls: Array<{ provider: LLMProvider; input: ProviderChangeActiveModelInput }> = [];
+  const service = createProviderModelsService({
+    resolveProvider: (provider) => ({
+      models: {
+        getSupportedModels: async () => createModels(`${provider}-models`),
+        getCurrentActiveModel: async () => createCurrentActiveModel(`${provider}-active`),
+        changeActiveModel: async (input) => {
+          calls.push({ provider, input });
+          return createSessionActiveModelChange(provider, input);
+        },
+      },
+    }),
+  });
+
+  const changedModel = await service.changeActiveModel('claude', {
+    sessionId: 'session-123',
+    model: 'opus',
+  });
+
+  assert.deepEqual(calls, [{
+    provider: 'claude',
+    input: {
+      sessionId: 'session-123',
+      model: 'opus',
+    },
+  }]);
+  assert.equal(changedModel.changed, true);
+  assert.equal(changedModel.model, 'opus');
+});
+
+test('resolveResumeModel prefers a stored changed model over the requested one', async () => {
+  const tempRoot = await mkdtemp(path.join(os.tmpdir(), 'provider-model-change-'));
+  const activeModelChangesPath = path.join(tempRoot, 'session-model-changes.json');
+
+  try {
+    const service = createProviderModelsService({
+      activeModelChangesPath,
+      resolveProvider: (provider) => ({
+        models: {
+          getSupportedModels: async () => createModels(`${provider}-models`),
+          getCurrentActiveModel: async () => createCurrentActiveModel(`${provider}-active`),
+          changeActiveModel: async (input) => createSessionActiveModelChange(provider, input),
+        },
+      }),
+    });
+
+    await writeProviderSessionActiveModelChange('cursor', {
+      sessionId: 'session-456',
+      model: 'composer-2',
+    }, {
+      filePath: activeModelChangesPath,
+    });
+
+    const model = await service.resolveResumeModel('cursor', 'session-456', 'composer-2-fast');
+    assert.equal(model, 'composer-2');
+  } finally {
+    await rm(tempRoot, { recursive: true, force: true });
+  }
+});
diff --git a/server/modules/providers/tests/skills.test.ts b/server/modules/providers/tests/skills.test.ts
index 179ae400..2c32c67b 100644
--- a/server/modules/providers/tests/skills.test.ts
+++ b/server/modules/providers/tests/skills.test.ts
@@ -377,6 +377,72 @@ test('providerSkillsService lists codex repository, user, and system skills', {
   }
 });
 
+/**
+ * This test covers OpenCode skill lookup across cwd-to-git-root project folders
+ * plus the global OpenCode/Claude/Agents compatibility locations.
+ */
+test('providerSkillsService lists opencode project and user compatibility skills', { concurrency: false }, async () => {
+  const tempRoot = await fs.mkdtemp(path.join(os.tmpdir(), 'llm-skills-opencode-'));
+  const repoRoot = path.join(tempRoot, 'repo');
+  const workspacePath = path.join(repoRoot, 'packages', 'app');
+  await fs.mkdir(path.join(repoRoot, '.git'), { recursive: true });
+  await fs.mkdir(workspacePath, { recursive: true });
+
+  const restoreHomeDir = patchHomeDir(tempRoot);
+  try {
+    await writeSkill(
+      path.join(workspacePath, '.opencode', 'skills'),
+      'opencode-cwd-dir',
+      'opencode-cwd',
+      'OpenCode cwd skill',
+    );
+    await writeSkill(
+      path.join(repoRoot, 'packages', '.claude', 'skills'),
+      'opencode-claude-parent-dir',
+      'opencode-claude-parent',
+      'OpenCode Claude parent skill',
+    );
+    await writeSkill(
+      path.join(repoRoot, '.agents', 'skills'),
+      'opencode-agents-root-dir',
+      'opencode-agents-root',
+      'OpenCode Agents root skill',
+    );
+    await writeSkill(
+      path.join(tempRoot, '.config', 'opencode', 'skills'),
+      'opencode-user-dir',
+      'opencode-user',
+      'OpenCode user skill',
+    );
+    await writeSkill(
+      path.join(tempRoot, '.claude', 'skills'),
+      'opencode-claude-user-dir',
+      'opencode-claude-user',
+      'OpenCode Claude user skill',
+    );
+    await writeSkill(
+      path.join(tempRoot, '.agents', 'skills'),
+      'opencode-agents-user-dir',
+      'opencode-agents-user',
+      'OpenCode Agents user skill',
+    );
+
+    const skills = await providerSkillsService.listProviderSkills('opencode', { workspacePath });
+    const byName = new Map(skills.map((skill) => [skill.name, skill]));
+
+    assert.equal(byName.get('opencode-cwd')?.scope, 'project');
+    assert.equal(byName.get('opencode-claude-parent')?.scope, 'project');
+    assert.equal(byName.get('opencode-agents-root')?.scope, 'project');
+    assert.equal(byName.get('opencode-user')?.scope, 'user');
+    assert.equal(byName.get('opencode-claude-user')?.scope, 'user');
+    assert.equal(byName.get('opencode-agents-user')?.scope, 'user');
+    assert.equal(byName.get('opencode-cwd')?.command, '/opencode-cwd');
+  } finally {
+    restoreHomeDir();
+    await fs.rm(tempRoot, { recursive: true, force: true });
+  }
+});
+
 /**
  * This test covers Gemini and Cursor skill directory rules, including shared
  * `.agents/skills` project support.
diff --git a/server/modules/websocket/services/chat-websocket.service.ts b/server/modules/websocket/services/chat-websocket.service.ts
index 95fabe55..829cb0b0 100644
--- a/server/modules/websocket/services/chat-websocket.service.ts
+++ b/server/modules/websocket/services/chat-websocket.service.ts
@@ -29,10 +29,12 @@ type ChatWebSocketDependencies = {
   spawnCursor: (command: string, options: unknown, writer: WebSocketWriter) => Promise<unknown>;
   queryCodex: (command: string, options: unknown, writer: WebSocketWriter) => Promise<unknown>;
   spawnGemini: (command: string, options: unknown, writer: WebSocketWriter) => Promise<unknown>;
+  spawnOpenCode: (command: string, options: unknown, writer: WebSocketWriter) => Promise<unknown>;
   abortClaudeSDKSession: (sessionId: string) => Promise<boolean>;
   abortCursorSession: (sessionId: string) => boolean;
   abortCodexSession: (sessionId: string) => boolean;
   abortGeminiSession: (sessionId: string) => boolean;
+  abortOpenCodeSession: (sessionId: string) => boolean;
   resolveToolApproval: (
     requestId: string,
     payload: {
@@ -46,19 +48,21 @@ type ChatWebSocketDependencies = {
   isCursorSessionActive: (sessionId: string) => boolean;
   isCodexSessionActive: (sessionId: string) => boolean;
   isGeminiSessionActive: (sessionId: string) => boolean;
+  isOpenCodeSessionActive: (sessionId: string) => boolean;
   reconnectSessionWriter: (sessionId: string, ws: WebSocket) => boolean;
   getPendingApprovalsForSession: (sessionId: string) => unknown[];
   getActiveClaudeSDKSessions: () => unknown;
   getActiveCursorSessions: () => unknown;
   getActiveCodexSessions: () => unknown;
   getActiveGeminiSessions: () => unknown;
+  getActiveOpenCodeSessions: () => unknown;
 };
 
 /**
  * Normalizes potentially invalid provider names coming from websocket payloads.
  */
 function readProvider(value: unknown): LLMProvider {
-  if (value === 'claude' || value === 'cursor' || value === 'codex' || value === 'gemini') {
+  if (value === 'claude' || value === 'cursor' || value === 'codex' || value === 'gemini' || value === 'opencode') {
     return value;
   }
 
@@ -134,6 +138,11 @@ export function handleChatConnection(
         return;
       }
 
+      if (messageType === 'opencode-command') {
+        await dependencies.spawnOpenCode(data.command ?? '', data.options, writer);
+        return;
+      }
+
       if (messageType === 'cursor-resume') {
         await dependencies.spawnCursor(
           '',
@@ -158,6 +167,8 @@ export function handleChatConnection(
           success = dependencies.abortCodexSession(sessionId);
         } else if (provider === 'gemini') {
           success = dependencies.abortGeminiSession(sessionId);
+        } else if (provider === 'opencode') {
+          success = dependencies.abortOpenCodeSession(sessionId);
         } else {
           success = await dependencies.abortClaudeSDKSession(sessionId);
         }
@@ -214,6 +225,8 @@ export function handleChatConnection(
           isActive = dependencies.isCodexSessionActive(sessionId);
         } else if (provider === 'gemini') {
           isActive = dependencies.isGeminiSessionActive(sessionId);
+        } else if (provider === 'opencode') {
+          isActive = dependencies.isOpenCodeSessionActive(sessionId);
         } else {
           isActive = dependencies.isClaudeSDKSessionActive(sessionId);
           if (isActive) {
@@ -251,6 +264,7 @@ export function handleChatConnection(
             cursor: dependencies.getActiveCursorSessions(),
             codex: dependencies.getActiveCodexSessions(),
             gemini: dependencies.getActiveGeminiSessions(),
+            opencode: dependencies.getActiveOpenCodeSessions(),
           },
         });
       }
diff --git a/server/modules/websocket/services/shell-websocket.service.ts b/server/modules/websocket/services/shell-websocket.service.ts
index 9bf7046b..b8f34ae8 100644
--- a/server/modules/websocket/services/shell-websocket.service.ts
+++ b/server/modules/websocket/services/shell-websocket.service.ts
@@ -136,6 +136,13 @@ function buildShellCommand(
     return command;
   }
 
+  if (provider === 'opencode') {
+    if (hasSession && sessionId) {
+      return `opencode --session "${sessionId}"`;
+    }
+    return initialCommand || 'opencode';
+  }
+
   const command = initialCommand || 'claude';
   if (hasSession && sessionId) {
     if (os.platform() === 'win32') {
@@ -389,6 +396,8 @@ export function handleShellConnection(
                 ? 'Codex'
                 : provider === 'gemini'
                   ? 'Gemini'
+                  : provider === 'opencode'
+                    ? 'OpenCode'
                   : 'Claude';
           welcomeMsg = hasSession
             ? `\x1b[36mResuming ${providerName} session ${sessionId} in: ${projectPath}\x1b[0m\r\n`
diff --git a/server/openai-codex.js b/server/openai-codex.js
index 03497c30..95913586 100644
--- a/server/openai-codex.js
+++ b/server/openai-codex.js
@@ -17,6 +17,7 @@ import { Codex } from '@openai/codex-sdk';
 import { notifyRunFailed, notifyRunStopped } from './services/notification-orchestrator.js';
 import { sessionsService } from './modules/providers/services/sessions.service.js';
 import { providerAuthService } from './modules/providers/services/provider-auth.service.js';
+import { providerModelsService } from './modules/providers/services/provider-models.service.js';
 import { createNormalizedMessage } from './shared/utils.js';
 
 // Track active sessions
@@ -202,6 +203,12 @@ export async function queryCodex(command, options = {}, ws) {
     permissionMode = 'default'
   } = options;
 
+  const resolvedModel = await providerModelsService.resolveResumeModel(
+    'codex',
+    sessionId,
+    model,
+  );
+
   const workingDirectory = cwd || projectPath || process.cwd();
   const { sandboxMode, approvalPolicy } = mapPermissionModeToCodexOptions(permissionMode);
 
@@ -222,7 +229,7 @@ export async function queryCodex(command, options = {}, ws) {
       skipGitRepoCheck: true,
       sandboxMode,
       approvalPolicy,
-      model
+      model: resolvedModel
     };
 
     // Start or resume thread
diff --git a/server/opencode-cli.js b/server/opencode-cli.js
new file mode 100644
index 00000000..c386d475
--- /dev/null
+++ b/server/opencode-cli.js
@@ -0,0 +1,263 @@
+import { spawn } from 'child_process';
+
+import crossSpawn from 'cross-spawn';
+
+import { sessionsService } from './modules/providers/services/sessions.service.js';
+import { providerAuthService } from './modules/providers/services/provider-auth.service.js';
+import { providerModelsService } from './modules/providers/services/provider-models.service.js';
+import { notifyRunFailed, notifyRunStopped } from './services/notification-orchestrator.js';
+import { createNormalizedMessage } from './shared/utils.js';
+
+const spawnFunction = process.platform === 'win32' ? crossSpawn : spawn;
+
+const activeOpenCodeProcesses = new Map();
+
+function readOpenCodeSessionId(event) {
+  if (!event || typeof event !== 'object') {
+    return null;
+  }
+
+  return event.sessionID || event.sessionId || null;
+}
+
+async function spawnOpenCode(command, options = {}, ws) {
+  return new Promise((resolve, reject) => {
+    const { sessionId, projectPath, cwd, model, sessionSummary } = options;
+    const workingDir = cwd || projectPath || process.cwd();
+    const processKey = sessionId || Date.now().toString();
+    let capturedSessionId = sessionId || null;
+    let sessionCreatedSent = false;
+    let stdoutLineBuffer = '';
+    let terminalNotificationSent = false;
+    let opencodeProcess = null;
+
+    const notifyTerminalState = ({ code = null, error = null } = {}) => {
+      if (terminalNotificationSent) {
+        return;
+      }
+
+      terminalNotificationSent = true;
+      const finalSessionId = capturedSessionId || sessionId || processKey;
+      if (code === 0 && !error) {
+        notifyRunStopped({
+          userId: ws?.userId || null,
+          provider: 'opencode',
+          sessionId: finalSessionId,
+          sessionName: sessionSummary,
+          stopReason: 'completed',
+        });
+        return;
+      }
+
+      notifyRunFailed({
+        userId: ws?.userId || null,
+        provider: 'opencode',
+        sessionId: finalSessionId,
+        sessionName: sessionSummary,
+        error: error || `OpenCode CLI exited with code ${code}`,
+      });
+    };
+
+    const registerSession = (nextSessionId) => {
+      if (!nextSessionId || capturedSessionId === nextSessionId) {
+        return;
+      }
+
+      capturedSessionId = nextSessionId;
+      if (processKey !== capturedSessionId && opencodeProcess) {
+        activeOpenCodeProcesses.delete(processKey);
+        activeOpenCodeProcesses.set(capturedSessionId, opencodeProcess);
+      }
+      if (opencodeProcess) {
+        opencodeProcess.sessionId = capturedSessionId;
+      }
+
+      if (ws.setSessionId && typeof ws.setSessionId === 'function') {
+        ws.setSessionId(capturedSessionId);
+      }
+
+      if (!sessionId && !sessionCreatedSent) {
+        sessionCreatedSent = true;
+        ws.send(createNormalizedMessage({
+          kind: 'session_created',
+          newSessionId: capturedSessionId,
+          sessionId: capturedSessionId,
+          provider: 'opencode',
+        }));
+      }
+    };
+
+    const processOpenCodeOutputLine = (line) => {
+      if (!line || !line.trim()) {
+        return;
+      }
+
+      let response;
+      try {
+        response = JSON.parse(line);
+      } catch {
+        ws.send(createNormalizedMessage({
+          kind: 'stream_delta',
+          content: line,
+          sessionId: capturedSessionId || sessionId || null,
+          provider: 'opencode',
+        }));
+        return;
+      }
+
+      try {
+        registerSession(readOpenCodeSessionId(response));
+        const normalized = sessionsService.normalizeMessage(
+          'opencode',
+          response,
+          capturedSessionId || sessionId || null,
+        );
+        for (const msg of normalized) {
+          ws.send(msg);
+        }
+      } catch (error) {
+        const errorContent = error instanceof Error ? error.message : String(error);
+        console.error('[OpenCode] Failed to process JSON output:', errorContent);
+        ws.send(createNormalizedMessage({
+          kind: 'error',
+          content: errorContent,
+          sessionId: capturedSessionId || sessionId || null,
+          provider: 'opencode',
+        }));
+      }
+    };
+
+    void providerModelsService.resolveResumeModel('opencode', sessionId, model).then((resolvedModel) => {
+      const args = ['run', '--format', 'json'];
+      if (sessionId) {
+        args.push('--session', sessionId);
+      }
+      if (resolvedModel) {
+        args.push('--model', resolvedModel);
+      }
+      if (command && command.trim()) {
+        args.push(command.trim());
+      }
+
+      opencodeProcess = spawnFunction('opencode', args, {
+        cwd: workingDir,
+        stdio: ['pipe', 'pipe', 'pipe'],
+        env: { ...process.env },
+      });
+
+      activeOpenCodeProcesses.set(processKey, opencodeProcess);
+      opencodeProcess.sessionId = processKey;
+      opencodeProcess.stdin.end();
+
+      opencodeProcess.stdout.on('data', (data) => {
+        stdoutLineBuffer += data.toString();
+        const completeLines = stdoutLineBuffer.split(/\r?\n/);
+        stdoutLineBuffer = completeLines.pop() || '';
+
+        completeLines.forEach((line) => {
+          processOpenCodeOutputLine(line.trim());
+        });
+      });
+
+      opencodeProcess.stderr.on('data', (data) => {
+        const stderrText = data.toString();
+        if (!stderrText.trim()) {
+          return;
+        }
+
+        ws.send(createNormalizedMessage({
+          kind: 'error',
+          content: stderrText,
+          sessionId: capturedSessionId || sessionId || null,
+          provider: 'opencode',
+        }));
+      });
+
+      opencodeProcess.on('close', async (code) => {
+        const finalSessionId = capturedSessionId || sessionId || processKey;
+        activeOpenCodeProcesses.delete(finalSessionId);
+        activeOpenCodeProcesses.delete(processKey);
+
+        if (stdoutLineBuffer.trim()) {
+          processOpenCodeOutputLine(stdoutLineBuffer.trim());
+          stdoutLineBuffer = '';
+        }
+
+        ws.send(createNormalizedMessage({
+          kind: 'complete',
+          exitCode: code,
+          isNewSession: !sessionId && !!command,
+          sessionId: finalSessionId,
+          provider: 'opencode',
+        }));
+
+        if (code === 0) {
+          notifyTerminalState({ code });
+          resolve();
+          return;
+        }
+
+        if (code === 127 || code === null) {
+          const installed = await providerAuthService.isProviderInstalled('opencode');
+          if (!installed) {
+            ws.send(createNormalizedMessage({
+              kind: 'error',
+              content: 'OpenCode CLI is not installed. Install it from https://opencode.ai/docs/',
+              sessionId: finalSessionId,
+              provider: 'opencode',
+            }));
+          }
+        }
+
+        notifyTerminalState({ code });
+        reject(new Error(code === null ? 'OpenCode CLI process was terminated' : `OpenCode CLI exited with code ${code}`));
+      });
+
+      opencodeProcess.on('error', async (error) => {
+        const finalSessionId = capturedSessionId || sessionId || processKey;
+        activeOpenCodeProcesses.delete(finalSessionId);
+        activeOpenCodeProcesses.delete(processKey);
+
+        const installed = await providerAuthService.isProviderInstalled('opencode');
+        const errorContent = !installed
+          ? 'OpenCode CLI is not installed. Install it from https://opencode.ai/docs/'
+          : error.message;
+
+        ws.send(createNormalizedMessage({
+          kind: 'error',
+          content: errorContent,
+          sessionId: finalSessionId,
+          provider: 'opencode',
+        }));
+        notifyTerminalState({ error });
+        reject(error);
+      });
+    }).catch(reject);
+  });
+}
+
+function abortOpenCodeSession(sessionId) {
+  const process = activeOpenCodeProcesses.get(sessionId);
+  if (!process) {
+    return false;
+  }
+
+  process.kill('SIGTERM');
+  activeOpenCodeProcesses.delete(sessionId);
+  return true;
+}
+
+function isOpenCodeSessionActive(sessionId) {
+  return activeOpenCodeProcesses.has(sessionId);
+}
+
+function getActiveOpenCodeSessions() {
+  return Array.from(activeOpenCodeProcesses.keys());
+}
+
+export {
+  spawnOpenCode,
+  abortOpenCodeSession,
+  isOpenCodeSessionActive,
+  getActiveOpenCodeSessions,
+};
diff --git a/server/opencode-cli.test.js b/server/opencode-cli.test.js
new file mode 100644
index 00000000..082451c3
--- /dev/null
+++ b/server/opencode-cli.test.js
@@ -0,0 +1,95 @@
+import assert from 'node:assert/strict';
+import { chmod, mkdtemp, rm, writeFile } from 'node:fs/promises';
+import os from 'node:os';
+import path from 'node:path';
+import test from 'node:test';
+
+import { spawnOpenCode } from './opencode-cli.js';
+
+const findEnvKey = (name) =>
+  Object.keys(process.env).find((key) => key.toLowerCase() === name.toLowerCase()) || name;
+
+async function createFakeOpenCodeExecutable(binDir) {
+  const scriptPath = path.join(binDir, 'opencode.js');
+  await writeFile(scriptPath, `
+const events = [
+  { type: 'text', sessionID: 'open-live-1', text: 'assistant response' },
+  { type: 'step_finish', sessionID: 'open-live-1' },
+];
+
+for (const event of events) {
+  console.log(JSON.stringify(event));
+}
+`, 'utf8');
+
+  if (process.platform === 'win32') {
+    const commandPath = path.join(binDir, 'opencode.cmd');
+    await writeFile(commandPath, '@echo off\r\nnode "%~dp0opencode.js" %*\r\n', 'utf8');
+    return;
+  }
+
+  const commandPath = path.join(binDir, 'opencode');
+  await writeFile(commandPath, '#!/bin/sh\nnode "$(dirname "$0")/opencode.js" "$@"\n', 'utf8');
+  await chmod(commandPath, 0o755);
+}
+
+test('spawnOpenCode emits session_created before normalized live messages for new sessions', async () => {
+  const tempRoot = await mkdtemp(path.join(os.tmpdir(), 'opencode-cli-live-'));
+  const pathKey = findEnvKey('PATH');
+  const pathExtKey = findEnvKey('PATHEXT');
+  const previousPath = process.env[pathKey];
+  const previousPathExt = process.env[pathExtKey];
+  const messages = [];
+  const writer = {
+    userId: null,
+    sessionId: null,
+    send(message) {
+      messages.push(message);
+    },
+    setSessionId(sessionId) {
+      this.sessionId = sessionId;
+    },
+  };
+
+  try {
+    await createFakeOpenCodeExecutable(tempRoot);
+    process.env[pathKey] = `${tempRoot}${path.delimiter}${previousPath || ''}`;
+    if (process.platform === 'win32') {
+      process.env[pathExtKey] = previousPathExt?.toUpperCase().includes('.CMD')
+        ? previousPathExt
+        : `.COM;.EXE;.BAT;.CMD${previousPathExt ? `;${previousPathExt}` : ''}`;
+    }
+
+    await spawnOpenCode('Hi', { cwd: tempRoot }, writer);
+
+    const sessionCreatedIndex = messages.findIndex((message) => message.kind === 'session_created');
+    const assistantDeltaIndex = messages.findIndex((message) =>
+      message.kind === 'stream_delta' && message.content === 'assistant response',
+    );
+    const streamEnd = messages.find((message) => message.kind === 'stream_end');
+    const complete = messages.find((message) => message.kind === 'complete');
+
+    assert.notEqual(sessionCreatedIndex, -1);
+    assert.notEqual(assistantDeltaIndex, -1);
+    assert.ok(sessionCreatedIndex < assistantDeltaIndex);
+    assert.equal(messages[sessionCreatedIndex].newSessionId, 'open-live-1');
+    assert.equal(writer.sessionId, 'open-live-1');
+    assert.equal(streamEnd?.sessionId, 'open-live-1');
+    assert.equal(complete?.sessionId, 'open-live-1');
+    assert.equal(messages.some((message) => message.kind === 'error'), false);
+  } finally {
+    if (previousPath === undefined) {
+      delete process.env[pathKey];
+    } else {
+      process.env[pathKey] = previousPath;
+    }
+
+    if (previousPathExt === undefined) {
+      delete process.env[pathExtKey];
+    } else {
+      process.env[pathExtKey] = previousPathExt;
+    }
+
+    await rm(tempRoot, { recursive: true, force: true });
+  }
+});
diff --git a/server/routes/agent.js b/server/routes/agent.js
index 37a9ed26..a5607588 100644
--- a/server/routes/agent.js
+++ b/server/routes/agent.js
@@ -9,8 +9,9 @@ import { queryClaudeSDK } from '../claude-sdk.js';
 import { spawnCursor } from '../cursor-cli.js';
 import { queryCodex } from '../openai-codex.js';
 import { spawnGemini } from '../gemini-cli.js';
+import { spawnOpenCode } from '../opencode-cli.js';
 import { Octokit } from '@octokit/rest';
-import { CLAUDE_MODELS, CURSOR_MODELS, CODEX_MODELS } from '../../shared/modelConstants.js';
+import { providerModelsService } from '../modules/providers/services/provider-models.service.js';
 import { IS_PLATFORM } from '../constants/config.js';
 import { normalizeProjectPath } from '../shared/utils.js';
 
@@ -608,7 +609,7 @@ class ResponseCollector {
 /**
  * POST /api/agent
  *
- * Trigger an AI agent (Claude or Cursor) to work on a project.
+ * Trigger an AI agent to work on a project.
  * Supports automatic GitHub branch and pull request creation after successful completion.
  *
  * ================================================================================================
@@ -633,7 +634,7 @@ class ResponseCollector {
  *                          - Source for auto-generated branch names (if createBranch=true and no branchName)
  *                          - Fallback for PR title if no commits are made
  *
- * @param {string} provider - (Optional) AI provider to use. Options: 'claude' | 'cursor' | 'codex' | 'gemini'
+ * @param {string} provider - (Optional) AI provider to use. Options: 'claude' | 'cursor' | 'codex' | 'gemini' | 'opencode'
  *                           Default: 'claude'
  *
  * @param {boolean} stream - (Optional) Enable Server-Sent Events (SSE) streaming for real-time updates.
@@ -751,7 +752,7 @@ class ResponseCollector {
  * Input Validations (400 Bad Request):
  *   - Either githubUrl OR projectPath must be provided (not neither)
  *   - message must be non-empty string
- *   - provider must be 'claude', 'cursor', 'codex', or 'gemini'
+ *   - provider must be 'claude', 'cursor', 'codex', 'gemini', or 'opencode'
  *   - createBranch/createPR requires githubUrl OR projectPath (not neither)
  *   - branchName must pass Git naming rules (if provided)
  *
@@ -859,8 +860,8 @@ router.post('/', validateExternalApiKey, async (req, res) => {
     return res.status(400).json({ error: 'message is required' });
   }
 
-  if (!['claude', 'cursor', 'codex', 'gemini'].includes(provider)) {
-    return res.status(400).json({ error: 'provider must be "claude", "cursor", "codex", or "gemini"' });
+  if (!['claude', 'cursor', 'codex', 'gemini', 'opencode'].includes(provider)) {
+    return res.status(400).json({ error: 'provider must be "claude", "cursor", "codex", "gemini", or "opencode"' });
   }
 
   // Validate GitHub branch/PR creation requirements
@@ -938,6 +939,10 @@ router.post('/', validateExternalApiKey, async (req, res) => {
       });
     }
 
+    const codexModels = (await providerModelsService.getProviderModels('codex')).models;
+    const geminiModels = (await providerModelsService.getProviderModels('gemini')).models;
+    const opencodeModels = (await providerModelsService.getProviderModels('opencode')).models;
+
     // Start the appropriate session
     if (provider === 'claude') {
       console.log('🤖 Starting Claude SDK session');
@@ -967,7 +972,7 @@ router.post('/', validateExternalApiKey, async (req, res) => {
         projectPath: finalProjectPath,
         cwd: finalProjectPath,
         sessionId: sessionId || null,
-        model: model || CODEX_MODELS.DEFAULT,
+        model: model || codexModels.DEFAULT,
         permissionMode: 'bypassPermissions'
       }, writer);
     } else if (provider === 'gemini') {
@@ -977,9 +982,18 @@ router.post('/', validateExternalApiKey, async (req, res) => {
         projectPath: finalProjectPath,
         cwd: finalProjectPath,
         sessionId: sessionId || null,
-        model: model,
+        model: model || geminiModels.DEFAULT,
         skipPermissions: true // CLI mode bypasses permissions
       }, writer);
+    } else if (provider === 'opencode') {
+      console.log('Starting OpenCode CLI session');
+
+      await spawnOpenCode(message.trim(), {
+        projectPath: finalProjectPath,
+        cwd: finalProjectPath,
+        sessionId: sessionId || null,
+        model: model || opencodeModels.DEFAULT
+      }, writer);
     }
 
     // Handle GitHub branch and PR creation after successful agent completion
diff --git a/server/routes/commands.js b/server/routes/commands.js
index bb61644f..fd197565 100644
--- a/server/routes/commands.js
+++ b/server/routes/commands.js
@@ -1,12 +1,12 @@
-import { promises as fs } from 'fs';
-import os from 'os';
-import path from 'path';
+import { promises as fs } from "fs";
+import os from "os";
+import path from "path";
 
-import express from 'express';
+import express from "express";
 
-import { CLAUDE_MODELS, CURSOR_MODELS, CODEX_MODELS } from '../../shared/modelConstants.js';
-import { parseFrontMatter } from '../shared/frontmatter.js';
-import { findAppRoot, getModuleDir } from '../utils/runtime-paths.js';
+import { providerModelsService } from "../modules/providers/services/provider-models.service.js";
+import { parseFrontMatter } from "../shared/frontmatter.js";
+import { findAppRoot, getModuleDir } from "../utils/runtime-paths.js";
 
 const __dirname = getModuleDir(import.meta.url);
 // This route reads the top-level package.json for the status command, so it needs the real
@@ -15,6 +15,77 @@ const APP_ROOT = findAppRoot(__dirname);
 
 const router = express.Router();
 
+const MODEL_PROVIDERS = ["claude", "cursor", "codex", "gemini", "opencode"];
+
+const MODEL_PROVIDER_LABELS = {
+  claude: "Claude",
+  cursor: "Cursor",
+  codex: "Codex",
+  gemini: "Gemini",
+  opencode: "OpenCode",
+};
+
+const readModelProvider = (value) => {
+  if (typeof value !== "string") {
+    return "claude";
+  }
+
+  const normalized = value.trim().toLowerCase();
+  return MODEL_PROVIDERS.includes(normalized) ? normalized : "claude";
+};
+
+const hasConcreteSessionId = (value) =>
+  typeof value === "string" && value.trim().length > 0;
+
+const resolveCommandModel = async (provider, catalog, sessionId) => {
+  if (!hasConcreteSessionId(sessionId)) {
+    return catalog.DEFAULT;
+  }
+
+  const currentActiveModel = await providerModelsService.getCurrentActiveModel(
+    provider,
+    sessionId,
+  );
+  return currentActiveModel?.model || catalog.DEFAULT;
+};
+
+export const executeModelsCommand = async (args, context) => {
+  const currentProvider = readModelProvider(context?.provider);
+  const result = await providerModelsService.getProviderModels(currentProvider);
+  const catalog = result.models;
+  const currentModel = await resolveCommandModel(
+    currentProvider,
+    catalog,
+    context?.sessionId,
+  );
+  const availableModels = catalog.OPTIONS.map((option) => option.value);
+  const availableOptions = catalog.OPTIONS.map((option) => ({
+    value: option.value,
+    label: option.label,
+    description: option.description,
+  }));
+
+  return {
+    type: "builtin",
+    action: "models",
+    data: {
+      current: {
+        provider: currentProvider,
+        providerLabel: MODEL_PROVIDER_LABELS[currentProvider],
+        model: currentModel,
+      },
+      available: {
+        [currentProvider]: availableModels,
+      },
+      availableModels,
+      availableOptions,
+      defaultModel: catalog.DEFAULT,
+      cache: result.cache,
+      message: `Current model: ${currentModel}`,
+    },
+  };
+};
+
 /**
  * Recursively scan directory for command files (.md)
  * @param {string} dir - Directory to scan
@@ -36,24 +107,30 @@ async function scanCommandsDirectory(dir, baseDir, namespace) {
 
       if (entry.isDirectory()) {
         // Recursively scan subdirectories
-        const subCommands = await scanCommandsDirectory(fullPath, baseDir, namespace);
+        const subCommands = await scanCommandsDirectory(
+          fullPath,
+          baseDir,
+          namespace,
+        );
         commands.push(...subCommands);
-      } else if (entry.isFile() && entry.name.endsWith('.md')) {
+      } else if (entry.isFile() && entry.name.endsWith(".md")) {
         // Parse markdown file for metadata
         try {
-          const content = await fs.readFile(fullPath, 'utf8');
-          const { data: frontmatter, content: commandContent } = parseFrontMatter(content);
+          const content = await fs.readFile(fullPath, "utf8");
+          const { data: frontmatter, content: commandContent } =
+            parseFrontMatter(content);
 
           // Calculate relative path from baseDir for command name
           const relativePath = path.relative(baseDir, fullPath);
           // Remove .md extension and convert to command name
-          const commandName = '/' + relativePath.replace(/\.md$/, '').replace(/\\/g, '/');
+          const commandName =
+            "/" + relativePath.replace(/\.md$/, "").replace(/\\/g, "/");
 
           // Extract description from frontmatter or first line of content
-          let description = frontmatter.description || '';
+          let description = frontmatter.description || "";
           if (!description) {
-            const firstLine = commandContent.trim().split('\n')[0];
-            description = firstLine.replace(/^#+\s*/, '').trim();
+            const firstLine = commandContent.trim().split("\n")[0];
+            description = firstLine.replace(/^#+\s*/, "").trim();
           }
 
           commands.push({
@@ -62,7 +139,7 @@ async function scanCommandsDirectory(dir, baseDir, namespace) {
             relativePath,
             description,
             namespace,
-            metadata: frontmatter
+            metadata: frontmatter,
           });
         } catch (err) {
           console.error(`Error parsing command file ${fullPath}:`, err.message);
@@ -71,7 +148,7 @@ async function scanCommandsDirectory(dir, baseDir, namespace) {
     }
   } catch (err) {
     // Directory doesn't exist or can't be accessed - this is okay
-    if (err.code !== 'ENOENT' && err.code !== 'EACCES') {
+    if (err.code !== "ENOENT" && err.code !== "EACCES") {
       console.error(`Error scanning directory ${dir}:`, err.message);
     }
   }
@@ -84,53 +161,41 @@ async function scanCommandsDirectory(dir, baseDir, namespace) {
  */
 const builtInCommands = [
   {
-    name: '/help',
-    description: 'Show help documentation for Claude Code',
-    namespace: 'builtin',
-    metadata: { type: 'builtin' }
+    name: "/help",
+    description: "Show help documentation for Claude Code",
+    namespace: "builtin",
+    metadata: { type: "builtin" },
   },
   {
-    name: '/clear',
-    description: 'Clear the conversation history',
-    namespace: 'builtin',
-    metadata: { type: 'builtin' }
+    name: "/models",
+    description: "View available models for the current provider",
+    namespace: "builtin",
+    metadata: { type: "builtin" },
   },
   {
-    name: '/model',
-    description: 'Switch or view the current AI model',
-    namespace: 'builtin',
-    metadata: { type: 'builtin' }
+    name: "/cost",
+    description: "Display token usage and cost information",
+    namespace: "builtin",
+    metadata: { type: "builtin" },
   },
   {
-    name: '/cost',
-    description: 'Display token usage and cost information',
-    namespace: 'builtin',
-    metadata: { type: 'builtin' }
+    name: "/memory",
+    description: "Open CLAUDE.md memory file for editing",
+    namespace: "builtin",
+    metadata: { type: "builtin" },
   },
   {
-    name: '/memory',
-    description: 'Open CLAUDE.md memory file for editing',
-    namespace: 'builtin',
-    metadata: { type: 'builtin' }
+    name: "/config",
+    description: "Open settings and configuration",
+    namespace: "builtin",
+    metadata: { type: "builtin" },
   },
   {
-    name: '/config',
-    description: 'Open settings and configuration',
-    namespace: 'builtin',
-    metadata: { type: 'builtin' }
+    name: "/status",
+    description: "Show system status and version information",
+    namespace: "builtin",
+    metadata: { type: "builtin" },
   },
-  {
-    name: '/status',
-    description: 'Show system status and version information',
-    namespace: 'builtin',
-    metadata: { type: 'builtin' }
-  },
-  {
-    name: '/rewind',
-    description: 'Rewind the conversation to a previous state',
-    namespace: 'builtin',
-    metadata: { type: 'builtin' }
-  }
 ];
 
 /**
@@ -138,14 +203,18 @@ const builtInCommands = [
  * Each handler returns { type: 'builtin', action: string, data: any }
  */
 const builtInHandlers = {
-  '/help': async (args, context) => {
+  "/help": async (args, context) => {
     const helpText = `# Claude Code Commands
 
 ## Built-in Commands
 
-${builtInCommands.map(cmd => `### ${cmd.name}
+${builtInCommands
+  .map(
+    (cmd) => `### ${cmd.name}
 ${cmd.description}
-`).join('\n')}
+`,
+  )
+  .join("\n")}
 
 ## Custom Commands
 
@@ -167,71 +236,40 @@ Custom commands can be created in:
 `;
 
     return {
-      type: 'builtin',
-      action: 'help',
+      type: "builtin",
+      action: "help",
       data: {
         content: helpText,
-        format: 'markdown'
-      }
+        format: "markdown",
+        commands: builtInCommands.map((command) => ({
+          name: command.name,
+          description: command.description,
+          namespace: command.namespace,
+        })),
+      },
     };
   },
 
-  '/clear': async (args, context) => {
-    return {
-      type: 'builtin',
-      action: 'clear',
-      data: {
-        message: 'Conversation history cleared'
-      }
-    };
-  },
+  "/models": executeModelsCommand,
 
-  '/model': async (args, context) => {
-    // Read available models from centralized constants
-    const availableModels = {
-      claude: CLAUDE_MODELS.OPTIONS.map(o => o.value),
-      cursor: CURSOR_MODELS.OPTIONS.map(o => o.value),
-      codex: CODEX_MODELS.OPTIONS.map(o => o.value)
-    };
-
-    const currentProvider = context?.provider || 'claude';
-    const currentModel = context?.model || CLAUDE_MODELS.DEFAULT;
-
-    return {
-      type: 'builtin',
-      action: 'model',
-      data: {
-        current: {
-          provider: currentProvider,
-          model: currentModel
-        },
-        available: availableModels,
-        message: args.length > 0
-          ? `Switching to model: ${args[0]}`
-          : `Current model: ${currentModel}`
-      }
-    };
-  },
-
-  '/cost': async (args, context) => {
+  "/cost": async (args, context) => {
     const tokenUsage = context?.tokenUsage || {};
-    const provider = context?.provider || 'claude';
-    const model =
-      context?.model ||
-      (provider === 'cursor'
-        ? CURSOR_MODELS.DEFAULT
-        : provider === 'codex'
-          ? CODEX_MODELS.DEFAULT
-          : CLAUDE_MODELS.DEFAULT);
+    const provider = readModelProvider(context?.provider);
+    const catalog = (await providerModelsService.getProviderModels(provider)).models;
+    const model = await resolveCommandModel(provider, catalog, context?.sessionId);
 
-    const used = Number(tokenUsage.used ?? tokenUsage.totalUsed ?? tokenUsage.total_tokens ?? 0) || 0;
+    const used =
+      Number(
+        tokenUsage.used ?? tokenUsage.totalUsed ?? tokenUsage.total_tokens ?? 0,
+      ) || 0;
     const total =
       Number(
         tokenUsage.total ??
           tokenUsage.contextWindow ??
-          parseInt(process.env.CONTEXT_WINDOW || '160000', 10),
+          parseInt(process.env.CONTEXT_WINDOW || "160000", 10),
       ) || 160000;
-    const percentage = total > 0 ? Number(((used / total) * 100).toFixed(1)) : 0;
+    const percentage =
+      total > 0 ? Number(((used / total) * 100).toFixed(1)) : 0;
 
     const inputTokensRaw =
       Number(
@@ -260,7 +298,9 @@ Custom commands can be created in:
 
     // If we only have total used tokens, treat them as input for display/estimation.
     const inputTokens =
-      inputTokensRaw > 0 || outputTokens > 0 || cacheTokens > 0 ? inputTokensRaw + cacheTokens : used;
+      inputTokensRaw > 0 || outputTokens > 0 || cacheTokens > 0
+        ? inputTokensRaw + cacheTokens
+        : used;
 
     // Rough default rates by provider (USD / 1M tokens).
     const pricingByProvider = {
@@ -275,76 +315,96 @@ Custom commands can be created in:
     const totalCost = inputCost + outputCost;
 
     return {
-      type: 'builtin',
-      action: 'cost',
+      type: "builtin",
+      action: "cost",
       data: {
         tokenUsage: {
           used,
           total,
           percentage,
         },
+        tokenBreakdown: {
+          input: inputTokens,
+          output: outputTokens,
+          cache: cacheTokens,
+        },
         cost: {
           input: inputCost.toFixed(4),
           output: outputCost.toFixed(4),
           total: totalCost.toFixed(4),
         },
+        provider,
         model,
       },
     };
   },
 
-  '/status': async (args, context) => {
+  "/status": async (args, context) => {
     // Read version from package.json
-    const packageJsonPath = path.join(APP_ROOT, 'package.json');
-    let version = 'unknown';
-    let packageName = 'claude-code-ui';
+    const packageJsonPath = path.join(APP_ROOT, "package.json");
+    let version = "unknown";
+    let packageName = "claude-code-ui";
 
     try {
-      const packageJson = JSON.parse(await fs.readFile(packageJsonPath, 'utf8'));
+      const packageJson = JSON.parse(
+        await fs.readFile(packageJsonPath, "utf8"),
+      );
       version = packageJson.version;
       packageName = packageJson.name;
     } catch (err) {
-      console.error('Error reading package.json:', err);
+      console.error("Error reading package.json:", err);
     }
 
     const uptime = process.uptime();
     const uptimeMinutes = Math.floor(uptime / 60);
     const uptimeHours = Math.floor(uptimeMinutes / 60);
-    const uptimeFormatted = uptimeHours > 0
-      ? `${uptimeHours}h ${uptimeMinutes % 60}m`
-      : `${uptimeMinutes}m`;
+    const uptimeFormatted =
+      uptimeHours > 0
+        ? `${uptimeHours}h ${uptimeMinutes % 60}m`
+        : `${uptimeMinutes}m`;
+
+    const statusProvider = readModelProvider(context?.provider);
+    const statusCatalog = (await providerModelsService.getProviderModels(statusProvider)).models;
+    const model = await resolveCommandModel(statusProvider, statusCatalog, context?.sessionId);
+    const memoryUsage = process.memoryUsage();
 
     return {
-      type: 'builtin',
-      action: 'status',
+      type: "builtin",
+      action: "status",
       data: {
         version,
         packageName,
         uptime: uptimeFormatted,
         uptimeSeconds: Math.floor(uptime),
-        model: context?.model || CLAUDE_MODELS.DEFAULT,
-        provider: context?.provider || 'claude',
+        model,
+        provider: statusProvider,
         nodeVersion: process.version,
-        platform: process.platform
-      }
+        platform: process.platform,
+        pid: process.pid,
+        memoryUsage: {
+          rssMb: Math.round(memoryUsage.rss / 1024 / 1024),
+          heapUsedMb: Math.round(memoryUsage.heapUsed / 1024 / 1024),
+          heapTotalMb: Math.round(memoryUsage.heapTotal / 1024 / 1024),
+        },
+      },
     };
   },
 
-  '/memory': async (args, context) => {
+  "/memory": async (args, context) => {
     const projectPath = context?.projectPath;
 
     if (!projectPath) {
       return {
-        type: 'builtin',
-        action: 'memory',
+        type: "builtin",
+        action: "memory",
         data: {
-          error: 'No project selected',
-          message: 'Please select a project to access its CLAUDE.md file'
-        }
+          error: "No project selected",
+          message: "Please select a project to access its CLAUDE.md file",
+        },
       };
     }
 
-    const claudeMdPath = path.join(projectPath, 'CLAUDE.md');
+    const claudeMdPath = path.join(projectPath, "CLAUDE.md");
 
     // Check if CLAUDE.md exists
     let exists = false;
@@ -356,85 +416,63 @@ Custom commands can be created in:
     }
 
     return {
-      type: 'builtin',
-      action: 'memory',
+      type: "builtin",
+      action: "memory",
       data: {
         path: claudeMdPath,
         exists,
         message: exists
           ? `Opening CLAUDE.md at ${claudeMdPath}`
-          : `CLAUDE.md not found at ${claudeMdPath}. Create it to store project-specific instructions.`
-      }
+          : `CLAUDE.md not found at ${claudeMdPath}. Create it to store project-specific instructions.`,
+      },
     };
   },
 
-  '/config': async (args, context) => {
+  "/config": async (args, context) => {
     return {
-      type: 'builtin',
-      action: 'config',
+      type: "builtin",
+      action: "config",
       data: {
-        message: 'Opening settings...'
-      }
+        message: "Opening settings...",
+      },
     };
   },
-
-  '/rewind': async (args, context) => {
-    const steps = args[0] ? parseInt(args[0]) : 1;
-
-    if (isNaN(steps) || steps < 1) {
-      return {
-        type: 'builtin',
-        action: 'rewind',
-        data: {
-          error: 'Invalid steps parameter',
-          message: 'Usage: /rewind [number] - Rewind conversation by N steps (default: 1)'
-        }
-      };
-    }
-
-    return {
-      type: 'builtin',
-      action: 'rewind',
-      data: {
-        steps,
-        message: `Rewinding conversation by ${steps} step${steps > 1 ? 's' : ''}...`
-      }
-    };
-  }
 };
 
 /**
  * POST /api/commands/list
  * List all available commands from project and user directories
  */
-router.post('/list', async (req, res) => {
+router.post("/list", async (req, res) => {
   try {
     const { projectPath } = req.body;
     const allCommands = [...builtInCommands];
 
     // Scan project-level commands (.claude/commands/)
     if (projectPath) {
-      const projectCommandsDir = path.join(projectPath, '.claude', 'commands');
+      const projectCommandsDir = path.join(projectPath, ".claude", "commands");
       const projectCommands = await scanCommandsDirectory(
         projectCommandsDir,
         projectCommandsDir,
-        'project'
+        "project",
       );
       allCommands.push(...projectCommands);
     }
 
     // Scan user-level commands (~/.claude/commands/)
     const homeDir = os.homedir();
-    const userCommandsDir = path.join(homeDir, '.claude', 'commands');
+    const userCommandsDir = path.join(homeDir, ".claude", "commands");
     const userCommands = await scanCommandsDirectory(
       userCommandsDir,
       userCommandsDir,
-      'user'
+      "user",
     );
     allCommands.push(...userCommands);
 
     // Separate built-in and custom commands
-    const customCommands = allCommands.filter(cmd => cmd.namespace !== 'builtin');
+    const customCommands = allCommands.filter(
+      (cmd) => cmd.namespace !== "builtin",
+    );
 
     // Sort commands alphabetically by name
     customCommands.sort((a, b) => a.name.localeCompare(b.name));
@@ -442,13 +480,13 @@ router.post('/list', async (req, res) => {
     res.json({
       builtIn: builtInCommands,
       custom: customCommands,
-      count: allCommands.length
+      count: allCommands.length,
     });
   } catch (error) {
-    console.error('Error listing commands:', error);
+    console.error("Error listing commands:", error);
     res.status(500).json({
-      error: 'Failed to list commands',
-      message: error.message
+      error: "Failed to list commands",
+      message: error.message,
     });
   }
 });
@@ -459,13 +497,13 @@ router.post('/list', async (req, res) => {
  * This endpoint prepares the command content but doesn't execute bash commands yet
  * (that will be handled in the command parser utility)
  */
-router.post('/execute', async (req, res) => {
+router.post("/execute", async (req, res) => {
   try {
     const { commandName, commandPath, args = [], context = {} } = req.body;
 
     if (!commandName) {
       return res.status(400).json({
-        error: 'Command name is required'
+        error: "Command name is required",
       });
     }
 
@@ -476,14 +514,17 @@ router.post('/execute', async (req, res) => {
         const result = await handler(args, context);
         return res.json({
           ...result,
-          command: commandName
+          command: commandName,
         });
       } catch (error) {
-        console.error(`Error executing built-in command ${commandName}:`, error);
+        console.error(
+          `Error executing built-in command ${commandName}:`,
+          error,
+        );
         return res.status(500).json({
-          error: 'Command execution failed',
+          error: "Command execution failed",
           message: error.message,
-          command: commandName
+          command: commandName,
         });
       }
     }
@@ -491,7 +532,7 @@ router.post('/execute', async (req, res) => {
     // Handle custom commands
     if (!commandPath) {
       return res.status(400).json({
-        error: 'Command path is required for custom commands'
+        error: "Command path is required for custom commands",
       });
     }
 
@@ -499,56 +540,62 @@ router.post('/execute', async (req, res) => {
     // Security: validate commandPath is within allowed directories
     {
       const resolvedPath = path.resolve(commandPath);
-      const userBase = path.resolve(path.join(os.homedir(), '.claude', 'commands'));
+      const userBase = path.resolve(
+        path.join(os.homedir(), ".claude", "commands"),
+      );
       const projectBase = context?.projectPath
-        ? path.resolve(path.join(context.projectPath, '.claude', 'commands'))
+        ? path.resolve(path.join(context.projectPath, ".claude", "commands"))
         : null;
       const isUnder = (base) => {
         const rel = path.relative(base, resolvedPath);
-        return rel !== '' && !rel.startsWith('..') && !path.isAbsolute(rel);
+        return rel !== "" && !rel.startsWith("..") && !path.isAbsolute(rel);
       };
       if (!(isUnder(userBase) || (projectBase && isUnder(projectBase)))) {
         return res.status(403).json({
-          error: 'Access denied',
-          message: 'Command must be in .claude/commands directory'
+          error: "Access denied",
+          message: "Command must be in .claude/commands directory",
         });
       }
     }
-    const content = await fs.readFile(commandPath, 'utf8');
-    const { data: metadata, content: commandContent } = parseFrontMatter(content);
+    const content = await fs.readFile(commandPath, "utf8");
+    const { data: metadata, content: commandContent } =
+      parseFrontMatter(content);
     // Basic argument replacement (will be enhanced in command parser utility)
     let processedContent = commandContent;
 
     // Replace $ARGUMENTS with all arguments joined
-    const argsString = args.join(' ');
+    const argsString = args.join(" ");
     processedContent = processedContent.replace(/\$ARGUMENTS/g, argsString);
 
     // Replace $1, $2, etc. with positional arguments
     args.forEach((arg, index) => {
       const placeholder = `$${index + 1}`;
-      processedContent = processedContent.replace(new RegExp(`\\${placeholder}\\b`, 'g'), arg);
+      processedContent = processedContent.replace(
+        new RegExp(`\\${placeholder}\\b`, "g"),
+        arg,
+      );
     });
 
     res.json({
-      type: 'custom',
+      type: "custom",
       command: commandName,
       content: processedContent,
       metadata,
-      hasFileIncludes: processedContent.includes('@'),
-      hasBashCommands: processedContent.includes('!')
+      hasFileIncludes: processedContent.includes("@"),
+      hasBashCommands: processedContent.includes("!"),
     });
   } catch (error) {
-    if (error.code === 'ENOENT') {
+    if (error.code === "ENOENT") {
       return res.status(404).json({
-        error: 'Command not found',
-        message: `Command file not found: ${req.body.commandPath}`
+        error: "Command not found",
+        message: `Command file not found: ${req.body.commandPath}`,
       });
     }
 
-    console.error('Error executing command:', error);
+    console.error("Error executing command:", error);
     res.status(500).json({
-      error: 'Failed to execute command',
-      message: error.message
+      error: "Failed to execute command",
+      message: error.message,
     });
   }
 });
diff --git a/server/routes/cursor.js b/server/routes/cursor.js
index 5fbe98ce..bcb2d61b 100644
--- a/server/routes/cursor.js
+++ b/server/routes/cursor.js
@@ -2,7 +2,7 @@ import express from 'express';
 import { promises as fs } from 'fs';
 import path from 'path';
 import os from 'os';
-import { CURSOR_MODELS } from '../../shared/modelConstants.js';
+import { CURSOR_FALLBACK_MODELS } from '../modules/providers/list/cursor/cursor-models.provider.js';
 
 const router = express.Router();
 
@@ -29,7 +29,7 @@ router.get('/config', async (req, res) => {
         config: {
           version: 1,
           model: {
-            modelId: CURSOR_MODELS.DEFAULT,
+            modelId: CURSOR_FALLBACK_MODELS.DEFAULT,
             displayName: 'GPT-5',
           },
           permissions: {
diff --git a/server/routes/tests/commands.test.js b/server/routes/tests/commands.test.js
new file mode 100644
index 00000000..ada58dac
--- /dev/null
+++ b/server/routes/tests/commands.test.js
@@ -0,0 +1,82 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+
+import { executeModelsCommand } from '../commands.js';
+import { providerModelsService } from '../../modules/providers/services/provider-models.service.js';
+
+test('models command returns available models only for the active provider', async () => {
+  const originalGetProviderModels = providerModelsService.getProviderModels;
+  const originalGetCurrentActiveModel = providerModelsService.getCurrentActiveModel;
+  let getCurrentActiveModelCalls = 0;
+
+  providerModelsService.getProviderModels = async () => ({
+    models: {
+      OPTIONS: [{ value: 'gpt-5.4', label: 'gpt-5.4' }],
+      DEFAULT: 'gpt-5.4',
+    },
+    cache: {
+      updatedAt: '2026-01-01T00:00:00.000Z',
+      expiresAt: '2026-01-04T00:00:00.000Z',
+      source: 'fresh',
+    },
+  });
+  providerModelsService.getCurrentActiveModel = async () => {
+    getCurrentActiveModelCalls += 1;
+    return {
+      model: 'gpt-5.3-codex',
+    };
+  };
+
+  try {
+    const result = await executeModelsCommand([], {
+      provider: 'codex',
+      model: 'gpt-5.4',
+    });
+
+    assert.equal(result.type, 'builtin');
+    assert.equal(result.action, 'models');
+    assert.equal(result.data.current.provider, 'codex');
+    assert.equal(result.data.current.model, 'gpt-5.4');
+    assert.deepEqual(Object.keys(result.data.available), ['codex']);
+    assert.deepEqual(result.data.available.codex, result.data.availableModels);
+    assert.ok(result.data.availableModels.includes('gpt-5.4'));
+    assert.equal(result.data.available.claude, undefined);
+    assert.equal(result.data.available.cursor, undefined);
+    assert.equal(getCurrentActiveModelCalls, 0);
+  } finally {
+    providerModelsService.getProviderModels = originalGetProviderModels;
+    providerModelsService.getCurrentActiveModel = originalGetCurrentActiveModel;
+  }
+});
+
+test('models command falls back to claude for unsupported providers', async () => {
+  const originalGetProviderModels = providerModelsService.getProviderModels;
+  const originalGetCurrentActiveModel = providerModelsService.getCurrentActiveModel;
+
+  providerModelsService.getProviderModels = async () => ({
+    models: {
+      OPTIONS: [{ value: 'default', label: 'Default (recommended)' }],
+      DEFAULT: 'default',
+    },
+    cache: {
+      updatedAt: '2026-01-01T00:00:00.000Z',
+      expiresAt: '2026-01-04T00:00:00.000Z',
+      source: 'fresh',
+    },
+  });
+  providerModelsService.getCurrentActiveModel = async () => ({
+    model: 'default',
+  });
+
+  try {
+    const result = await executeModelsCommand([], {
+      provider: 'unknown-provider',
+    });
+
+    assert.equal(result.data.current.provider, 'claude');
+    assert.deepEqual(Object.keys(result.data.available), ['claude']);
+  } finally {
+    providerModelsService.getProviderModels = originalGetProviderModels;
+    providerModelsService.getCurrentActiveModel = originalGetCurrentActiveModel;
+  }
+});
diff --git a/server/shared/interfaces.ts b/server/shared/interfaces.ts
index bc97ffb3..1864fd02 100644
--- a/server/shared/interfaces.ts
+++ b/server/shared/interfaces.ts
@@ -7,7 +7,11 @@ import type {
   ProviderSkill,
   ProviderSkillListOptions,
   ProviderAuthStatus,
+  ProviderChangeActiveModelInput,
+  ProviderCurrentActiveModel,
+  ProviderModelsDefinition,
   ProviderMcpServer,
+  ProviderSessionActiveModelChange,
   UpsertProviderMcpServerInput,
 } from '@/shared/types.js';
 
@@ -20,6 +24,7 @@ import type {
  */
 export interface IProvider {
   readonly id: LLMProvider;
+  readonly models: IProviderModels;
   readonly mcp: IProviderMcp;
   readonly auth: IProviderAuth;
   readonly skills: IProviderSkills;
@@ -27,6 +32,46 @@ export interface IProvider {
   readonly sessionSynchronizer: IProviderSessionSynchronizer;
 }
 
+// ---------------------------
+//----------------- PROVIDER MODEL INTERFACE ------------
+/**
+ * Model catalog contract for one provider.
+ *
+ * Implementations are responsible for resolving the provider's currently
+ * supported models and converting them into the shared
+ * `ProviderModelsDefinition` shape used by backend routes and frontend model
+ * pickers. The `DEFAULT` field should be the most appropriate default selection
+ * for that provider at the time the catalog is read.
+ */
+export interface IProviderModels {
+  /**
+   * Returns the provider's currently supported model catalog.
+   */
+  getSupportedModels(): Promise<ProviderModelsDefinition>;
+
+  /**
+   * Returns the currently active model for one session or provider runtime.
+   *
+   * Implementations must use the provider-specific lookup mechanism approved
+   * for that provider and fall back only to the provider catalog default when
+   * no active model can be resolved.
+   */
+  getCurrentActiveModel(sessionId?: string): Promise<ProviderCurrentActiveModel>;
+
+  /**
+   * Persists a session-scoped model override that the next resumed turn should
+   * honor for this provider.
+   *
+   * This does not require the provider to mutate an already running remote
+   * session in-place. Instead, adapters store the user's explicit model choice
+   * so the backend resume path can add the correct provider-native model option
+   * on the next CLI/SDK invocation for the same session.
+   */
+  changeActiveModel(
+    input: ProviderChangeActiveModelInput,
+  ): Promise<ProviderSessionActiveModelChange>;
+}
+
 // ---------------------------
 //----------------- PROVIDER AUTH INTERFACE ------------
 /**
diff --git a/server/shared/types.ts b/server/shared/types.ts
index de277d83..dbcef5d4 100644
--- a/server/shared/types.ts
+++ b/server/shared/types.ts
@@ -65,7 +65,94 @@ export type AuthenticatedWebSocketRequest = IncomingMessage & {
  * Use this as the source of truth whenever a function or payload needs to identify
  * a specific LLM integration.
  */
-export type LLMProvider = 'claude' | 'codex' | 'gemini' | 'cursor';
+export type LLMProvider = 'claude' | 'codex' | 'gemini' | 'cursor' | 'opencode';
+
+/**
+ * One selectable model row (matches the documentation `public/modelConstants.js` option shape).
+ */
+export type ProviderModelOption = {
+  value: string;
+  label: string;
+  description?: string;
+};
+
+/**
+ * Provider model catalog returned by `GET /api/providers/:provider/models`.
+ */
+export type ProviderModelsDefinition = {
+  OPTIONS: ProviderModelOption[];
+  DEFAULT: string;
+};
+
+/**
+ * Cache metadata returned alongside one provider model catalog.
+ *
+ * `updatedAt` is when the current cached snapshot was last refreshed from the
+ * provider itself. `expiresAt` is the backend cache expiry timestamp, and
+ * `source` tells callers whether the current response came from in-memory cache,
+ * persisted disk cache, or a fresh provider fetch.
+ */
+export type ProviderModelsCacheInfo = {
+  updatedAt: string;
+  expiresAt: string;
+  source: 'memory' | 'disk' | 'fresh';
+};
+
+/**
+ * Full provider model lookup result returned by the backend service layer.
+ *
+ * Use this shape when a caller needs both the selectable model catalog and the
+ * cache metadata that explains how current the catalog is.
+ */
+export type ProviderModelsResult = {
+  models: ProviderModelsDefinition;
+  cache: ProviderModelsCacheInfo;
+};
+
+// ---------------------------
+//----------------- PROVIDER ACTIVE MODEL TYPES ------------
+/**
+ * Provider-neutral result for the model that is actively driving a session or
+ * provider runtime at the time of lookup.
+ *
+ * `model` must always be populated. Provider adapters should use the
+ * provider-specific lookup method requested by the caller, and only fall back
+ * to the provider catalog `DEFAULT` value when the active model cannot be read.
+ */
+export type ProviderCurrentActiveModel = {
+  model: string;
+};
+
+/**
+ * Input payload used when one session needs to use a different model on its
+ * next resumed turn.
+ *
+ * This is a backend-owned session override, not a claim that the provider has
+ * already switched the currently running session in-place. Provider adapters
+ * persist this request so the next CLI/SDK resume can inject the chosen model
+ * using the provider-specific mechanism supported by that runtime.
+ */
+export type ProviderChangeActiveModelInput = {
+  sessionId: string;
+  model: string;
+};
+
+/**
+ * Provider-neutral session model-change state.
+ *
+ * `supported` indicates whether the provider adapter supports the app's
+ * session-scoped resume override flow. `changed` is the persisted boolean the
+ * resume layer checks before forcing a model on the next resumed turn. When
+ * `changed` is `false`, `model` is `null` and the runtime should use the
+ * normal request/default model selection path.
+ */
+export type ProviderSessionActiveModelChange = {
+  provider: LLMProvider;
+  sessionId: string;
+  supported: boolean;
+  changed: boolean;
+  model: string | null;
+};
 
 /**
  * Message/event variants emitted by provider adapters and normalized transports.
diff --git a/server/shared/utils.ts b/server/shared/utils.ts
index 2903814e..821489c5 100644
--- a/server/shared/utils.ts
+++ b/server/shared/utils.ts
@@ -22,7 +22,13 @@ import type {
   AnyRecord,
   ApiSuccessShape,
   AppErrorOptions,
+  LLMProvider,
   NormalizedMessage,
+  ProviderChangeActiveModelInput,
+  ProviderCurrentActiveModel,
+  ProviderModelsDefinition,
+  ProviderSessionActiveModelChange,
+  ProviderSkillSource,
   WorkspacePathValidationResult,
 } from '@/shared/types.js';
 
@@ -413,6 +419,231 @@ export const readStringRecord = (value: unknown): Record<string, string> | undef
   return Object.keys(normalized).length > 0 ? normalized : undefined;
 };
 
+// ---------------------------
+//----------------- PROVIDER MODEL LOOKUP UTILITIES ------------
+/**
+ * Builds the standard "default current model" result used when a provider
+ * cannot resolve a session-backed active model.
+ *
+ * Provider model adapters should call this after loading their supported model
+ * catalog so the fallback stays aligned with the provider's current `DEFAULT`
+ * selection instead of drifting to a hard-coded duplicate.
+ */
+export function buildDefaultProviderCurrentActiveModel(
+  models: ProviderModelsDefinition,
+): ProviderCurrentActiveModel {
+  return {
+    model: models.DEFAULT,
+  };
+}
+
+// ---------------------------
+//----------------- PROVIDER SESSION MODEL CHANGE UTILITIES ------------
+type ProviderSessionActiveModelChangeCacheEntry = ProviderSessionActiveModelChange & {
+  updatedAt: string;
+};
+
+type ProviderSessionActiveModelChangeCacheFile = {
+  version: number;
+  entries: Record<string, ProviderSessionActiveModelChangeCacheEntry>;
+};
+
+const PROVIDER_SESSION_ACTIVE_MODEL_CHANGE_CACHE_VERSION = 1;
+
+/**
+ * Resolves the backend-owned cache file used for session-scoped resume model
+ * overrides.
+ *
+ * The file lives under `~/.cloudcli` because these overrides are an application
+ * concern rather than a provider-native config file. Providers, routes, and
+ * runtime command launchers should all use this helper instead of re-creating
+ * the path so the storage location stays consistent.
+ */
+export function getProviderSessionActiveModelChangesPath(): string {
+  return path.join(os.homedir(), '.cloudcli', 'provider-session-active-model-changes.json');
+}
+
+const buildProviderSessionActiveModelChangeKey = (
+  provider: LLMProvider,
+  sessionId: string,
+): string => `${provider}:${sessionId}`;
+
+const isProviderSessionActiveModelChangeCacheEntry = (
+  value: unknown,
+): value is ProviderSessionActiveModelChangeCacheEntry => {
+  const record = readObjectRecord(value);
+  return Boolean(
+    record
+    && typeof record.provider === 'string'
+    && typeof record.sessionId === 'string'
+    && typeof record.supported === 'boolean'
+    && typeof record.changed === 'boolean'
+    && (typeof record.model === 'string' || record.model === null)
+    && typeof record.updatedAt === 'string',
+  );
+};
+
+const readProviderSessionActiveModelChangeCacheFile = async (
+  filePath: string,
+): Promise<ProviderSessionActiveModelChangeCacheFile> => {
+  try {
+    const raw = await readFile(filePath, 'utf8');
+    const parsed = readObjectRecord(JSON.parse(raw));
+    if (
+      !parsed
+      || parsed.version !== PROVIDER_SESSION_ACTIVE_MODEL_CHANGE_CACHE_VERSION
+      || !readObjectRecord(parsed.entries)
+    ) {
+      return {
+        version: PROVIDER_SESSION_ACTIVE_MODEL_CHANGE_CACHE_VERSION,
+        entries: {},
+      };
+    }
+
+    const entries = Object.fromEntries(
+      Object.entries(parsed.entries).filter((entry): entry is [string, ProviderSessionActiveModelChangeCacheEntry] =>
+        isProviderSessionActiveModelChangeCacheEntry(entry[1]),
+      ),
+    );
+
+    return {
+      version: PROVIDER_SESSION_ACTIVE_MODEL_CHANGE_CACHE_VERSION,
+      entries,
+    };
+  } catch {
+    return {
+      version: PROVIDER_SESSION_ACTIVE_MODEL_CHANGE_CACHE_VERSION,
+      entries: {},
+    };
+  }
+};
+
+const writeProviderSessionActiveModelChangeCacheFile = async (
+  filePath: string,
+  payload: ProviderSessionActiveModelChangeCacheFile,
+): Promise<void> => {
+  await mkdir(path.dirname(filePath), { recursive: true });
+  await writeFile(filePath, `${JSON.stringify(payload, null, 2)}\n`, 'utf8');
+};
+
+const buildUnsupportedProviderSessionActiveModelChange = (
+  provider: LLMProvider,
+  sessionId: string,
+): ProviderSessionActiveModelChange => ({
+  provider,
+  sessionId,
+  supported: false,
+  changed: false,
+  model: null,
+});
+
+/**
+ * Reads the persisted session model-change state for one provider session.
+ *
+ * Runtime resume paths use this to decide whether they should inject a
+ * provider-specific model argument/thread option for the next resumed turn.
+ * Missing cache entries are normalized to `{ changed: false }` so callers can
+ * treat absence as "use the ordinary model selection flow".
+ */
+export async function readProviderSessionActiveModelChange(
+  provider: LLMProvider,
+  sessionId: string,
+  options: {
+    filePath?: string;
+    supported?: boolean;
+  } = {},
+): Promise<ProviderSessionActiveModelChange> {
+  const normalizedSessionId = sessionId.trim();
+  if (!normalizedSessionId) {
+    return buildUnsupportedProviderSessionActiveModelChange(provider, normalizedSessionId);
+  }
+
+  const supported = options.supported ?? true;
+  if (!supported) {
+    return buildUnsupportedProviderSessionActiveModelChange(provider, normalizedSessionId);
+  }
+
+  const filePath = options.filePath ?? getProviderSessionActiveModelChangesPath();
+  const cacheFile = await readProviderSessionActiveModelChangeCacheFile(filePath);
+  const cacheEntry = cacheFile.entries[
+    buildProviderSessionActiveModelChangeKey(provider, normalizedSessionId)
+  ];
+
+  if (!cacheEntry || !cacheEntry.changed || !cacheEntry.model?.trim()) {
+    return {
+      provider,
+      sessionId: normalizedSessionId,
+      supported: true,
+      changed: false,
+      model: null,
+    };
+  }
+
+  return {
+    provider,
+    sessionId: normalizedSessionId,
+    supported: true,
+    changed: true,
+    model: cacheEntry.model.trim(),
+  };
+}
+
+/**
+ * Persists a session model-change request for one provider.
+ *
+ * Provider adapters call this when the frontend explicitly selects a different
+ * model for an existing session. The stored `changed: true` flag is the single
+ * source of truth used later by resume paths to decide whether they should add
+ * a provider-native model override on the next invocation.
+ */
+export async function writeProviderSessionActiveModelChange(
+  provider: LLMProvider,
+  input: ProviderChangeActiveModelInput,
+  options: {
+    filePath?: string;
+    supported?: boolean;
+  } = {},
+): Promise<ProviderSessionActiveModelChange> {
+  const normalizedSessionId = input.sessionId.trim();
+  const normalizedModel = input.model.trim();
+  const supported = options.supported ?? true;
+
+  if (!supported) {
+    return buildUnsupportedProviderSessionActiveModelChange(provider, normalizedSessionId);
+  }
+
+  if (!normalizedSessionId || !normalizedModel) {
+    return {
+      provider,
+      sessionId: normalizedSessionId,
+      supported: true,
+      changed: false,
+      model: null,
+    };
+  }
+
+  const filePath = options.filePath ?? getProviderSessionActiveModelChangesPath();
+  const cacheFile = await readProviderSessionActiveModelChangeCacheFile(filePath);
+  cacheFile.entries[buildProviderSessionActiveModelChangeKey(provider, normalizedSessionId)] = {
+    provider,
+    sessionId: normalizedSessionId,
+    supported: true,
+    changed: true,
+    model: normalizedModel,
+    updatedAt: new Date().toISOString(),
+  };
+
+  await writeProviderSessionActiveModelChangeCacheFile(filePath, cacheFile);
+
+  return {
+    provider,
+    sessionId: normalizedSessionId,
+    supported: true,
+    changed: true,
+    model: normalizedModel,
+  };
+}
+
 // ---------------------------
 //----------------- WEBSOCKET PAYLOAD PARSING UTILITIES ------------
 /**
@@ -506,6 +737,67 @@ export const writeJsonConfig = async (filePath: string, data: Record<string, unk
 
 // ---------------------------
 //----------------- PROVIDER SKILL FILE UTILITIES ------------
+async function hasGitMarker(dirPath: string): Promise<boolean> {
+  try {
+    const gitMarkerStats = await stat(path.join(dirPath, '.git'));
+    return gitMarkerStats.isDirectory() || gitMarkerStats.isFile();
+  } catch {
+    return false;
+  }
+}
+
+/**
+ * Finds the highest git worktree root visible from a starting directory.
+ *
+ * Provider skill systems such as Codex and OpenCode walk upward through parent
+ * folders when resolving repository/project skills. Use this helper when a
+ * provider needs the topmost `.git` marker instead of only the nearest one, so
+ * monorepos and nested package folders discover shared root-level skills once.
+ */
+export async function findTopmostGitRoot(startPath: string): Promise<string | null> {
+  let currentPath = path.resolve(startPath);
+  let topmostGitRoot: string | null = null;
+
+  while (true) {
+    if (await hasGitMarker(currentPath)) {
+      topmostGitRoot = currentPath;
+    }
+
+    const parentPath = path.dirname(currentPath);
+    if (parentPath === currentPath) {
+      break;
+    }
+
+    currentPath = parentPath;
+  }
+
+  return topmostGitRoot;
+}
+
+/**
+ * Adds one provider skill source after normalizing and de-duplicating its root.
+ *
+ * Provider skill lookup rules often point at overlapping folders (for example a
+ * workspace folder can also be the git root). Use this helper while building a
+ * provider's `ProviderSkillSource[]` so the shared skills scanner reads each
+ * physical root once and still preserves provider-specific scope/command data.
+ */
+export function addUniqueProviderSkillSource(
+  sources: ProviderSkillSource[],
+  seenRootDirs: Set<string>,
+  source: ProviderSkillSource,
+): void {
+  const normalizedRootDir = path.resolve(source.rootDir);
+  if (seenRootDirs.has(normalizedRootDir)) {
+    return;
+  }
+
+  seenRootDirs.add(normalizedRootDir);
+  sources.push({ ...source, rootDir: normalizedRootDir });
+}
+
+// ---------------------------
+//----------------- PROVIDER SKILL MARKDOWN UTILITIES ------------
 /**
  * Finds direct child skill markdown files under a provider skill root.
  *
@@ -616,6 +908,98 @@ export function normalizeSessionName(rawValue: string | undefined, fallback: str
   return normalized.slice(0, 120);
 }
 
+// ---------------------------
+//----------------- PROVIDER SESSION VALUE NORMALIZATION UTILITIES ------------
+/**
+ * Converts provider-native timestamps into ISO strings.
+ *
+ * Provider CLIs commonly persist epoch timestamps as milliseconds, seconds, or
+ * already-formatted date strings. Use this helper when normalizing session
+ * metadata or transcript events so every provider writes the same ISO timestamp
+ * shape to API responses and database rows.
+ */
+export function normalizeProviderTimestamp(value: unknown): string {
+  if (typeof value === 'number' && Number.isFinite(value) && value > 0) {
+    const millis = value < 1_000_000_000_000 ? value * 1000 : value;
+    return new Date(millis).toISOString();
+  }
+
+  if (typeof value === 'string' && value.trim()) {
+    const parsed = Number(value);
+    if (Number.isFinite(parsed)) {
+      return normalizeProviderTimestamp(parsed);
+    }
+
+    const date = new Date(value);
+    if (!Number.isNaN(date.getTime())) {
+      return date.toISOString();
+    }
+  }
+
+  return new Date().toISOString();
+}
+
+/**
+ * Parses a JSON string or narrows an existing object into a plain record.
+ *
+ * Use this when provider databases store structured JSON inside text columns.
+ * Invalid JSON, arrays, and primitive values return `null` so callers can skip
+ * malformed optional metadata without hiding the rest of a session transcript.
+ */
+export function readJsonRecord(value: unknown): AnyRecord | null {
+  if (typeof value !== 'string') {
+    return readObjectRecord(value);
+  }
+
+  try {
+    return readObjectRecord(JSON.parse(value));
+  } catch {
+    return null;
+  }
+}
+
+// ---------------------------
+//----------------- OPENCODE SESSION STORAGE UTILITIES ------------
+/**
+ * Resolves the OpenCode SQLite session database path.
+ *
+ * OpenCode stores session, message, part, and project metadata in one shared
+ * `opencode.db` file under its XDG data directory. Provider readers and
+ * synchronizers should use this path for read-only access and should never store
+ * it as a deletable transcript path for an individual app session row.
+ */
+export function getOpenCodeDatabasePath(): string {
+  return path.join(os.homedir(), '.local', 'share', 'opencode', 'opencode.db');
+}
+
+// ---------------------------
+//----------------- SAFE DIRECTORY NAME UTILITIES ------------
+/**
+ * Validates that a user or provider supplied identifier can safely be treated
+ * as one leaf directory name under an existing root folder.
+ *
+ * Use this before composing paths like `<root>/<session-id>/file.db>` to block
+ * path traversal and accidental nested paths. The returned string is trimmed but
+ * otherwise unchanged so callers can still match the provider's on-disk naming.
+ */
+export function sanitizeLeafDirectoryName(inputName: string, label = 'directory name'): string {
+  const normalized = inputName.trim();
+  if (!normalized) {
+    throw new Error(`${label} is required.`);
+  }
+
+  if (
+    normalized.includes('..')
+    || normalized.includes(path.posix.sep)
+    || normalized.includes(path.win32.sep)
+    || normalized !== path.basename(normalized)
+  ) {
+    throw new Error(`Invalid ${label} "${inputName}".`);
+  }
+
+  return normalized;
+}
+
 // ---------------------------
 //----------------- SESSION SYNCHRONIZER FILESYSTEM HELPERS ------------
 /**
diff --git a/shared/modelConstants.js b/shared/modelConstants.js
deleted file mode 100644
index ae42ed27..00000000
--- a/shared/modelConstants.js
+++ /dev/null
@@ -1,107 +0,0 @@
-/**
- * Centralized Model Definitions
- * Single source of truth for all supported AI models
- */
-
-/**
- * Claude (Anthropic) Models
- *
- * Note: Claude uses two different formats:
- * - SDK format ('sonnet', 'opus') - used by the UI and claude-sdk.js
- * - API format ('claude-sonnet-4.5') - used by slash commands for display
- */
-export const CLAUDE_MODELS = {
-  // Models in SDK format (what the actual SDK accepts)
-  OPTIONS: [
-    { value: "opus", label: "Opus" },
-    { value: "sonnet", label: "Sonnet" },
-    { value: "haiku", label: "Haiku" },
-    { value: "claude-opus-4-6", label: "Opus 4.6" },
-    { value: "opusplan", label: "Opus Plan" },
-    { value: "sonnet[1m]", label: "Sonnet [1M]" },
-    { value: "opus[1m]", label: "Opus [1M]" },
-  ],
-
-  DEFAULT: "opus",
-};
-
-/**
- * Cursor Models
- */
-export const CURSOR_MODELS = {
-  OPTIONS: [
-    { value: "opus-4.6-thinking", label: "Claude 4.6 Opus (Thinking)" },
-    { value: "gpt-5.3-codex", label: "GPT-5.3" },
-    { value: "gpt-5.2-high", label: "GPT-5.2 High" },
-    { value: "gemini-3-pro", label: "Gemini 3 Pro" },
-    { value: "opus-4.5-thinking", label: "Claude 4.5 Opus (Thinking)" },
-    { value: "gpt-5.2", label: "GPT-5.2" },
-    { value: "gpt-5.1", label: "GPT-5.1" },
-    { value: "gpt-5.1-high", label: "GPT-5.1 High" },
-    { value: "composer-1", label: "Composer 1" },
-    { value: "auto", label: "Auto" },
-    { value: "sonnet-4.5", label: "Claude 4.5 Sonnet" },
-    { value: "sonnet-4.5-thinking", label: "Claude 4.5 Sonnet (Thinking)" },
-    { value: "opus-4.5", label: "Claude 4.5 Opus" },
-    { value: "gpt-5.1-codex", label: "GPT-5.1 Codex" },
-    { value: "gpt-5.1-codex-high", label: "GPT-5.1 Codex High" },
-    { value: "gpt-5.1-codex-max", label: "GPT-5.1 Codex Max" },
-    { value: "gpt-5.1-codex-max-high", label: "GPT-5.1 Codex Max High" },
-    { value: "opus-4.1", label: "Claude 4.1 Opus" },
-    { value: "grok", label: "Grok" },
-  ],
-
-  DEFAULT: "gpt-5.3-codex",
-};
-
-/**
- * Codex (OpenAI) Models
- */
-export const CODEX_MODELS = {
-  OPTIONS: [
-    { value: "gpt-5.5", label: "GPT-5.5" },
-    { value: "gpt-5.4", label: "GPT-5.4" },
-    { value: "gpt-5.4-mini", label: "GPT-5.4 mini" },
-    { value: "gpt-5.3-codex", label: "GPT-5.3 Codex" },
-    { value: "gpt-5.2-codex", label: "GPT-5.2 Codex" },
-    { value: "gpt-5.2", label: "GPT-5.2" },
-    { value: "gpt-5.1-codex-max", label: "GPT-5.1 Codex Max" },
-    { value: "o3", label: "O3" },
-    { value: "o4-mini", label: "O4-mini" },
-  ],
-
-  DEFAULT: "gpt-5.4",
-};
-
-/**
- * Gemini Models
- */
-export const GEMINI_MODELS = {
-  OPTIONS: [
-    { value: "gemini-3.1-pro-preview", label: "Gemini 3.1 Pro Preview" },
-    { value: "gemini-3-pro-preview", label: "Gemini 3 Pro Preview" },
-    { value: "gemini-3-flash-preview", label: "Gemini 3 Flash Preview" },
-    { value: "gemini-2.5-flash", label: "Gemini 2.5 Flash" },
-    { value: "gemini-2.5-pro", label: "Gemini 2.5 Pro" },
-    { value: "gemini-2.0-flash-lite", label: "Gemini 2.0 Flash Lite" },
-    { value: "gemini-2.5-flash-lite", label: "Gemini 2.5 Flash Lite" },
-    { value: "gemini-2.0-flash", label: "Gemini 2.0 Flash" },
-    { value: "gemini-2.0-pro-exp", label: "Gemini 2.0 Pro Experimental" },
-    {
-      value: "gemini-2.0-flash-thinking-exp",
-      label: "Gemini 2.0 Flash Thinking",
-    },
-  ],
-
-  DEFAULT: "gemini-3.1-pro-preview",
-};
-
-/**
- * Ordered provider registry. Display order in selection UIs.
- */
-export const PROVIDERS = [
-  { id: "claude", name: "Anthropic", models: CLAUDE_MODELS },
-  { id: "codex", name: "OpenAI", models: CODEX_MODELS },
-  { id: "gemini", name: "Google", models: GEMINI_MODELS },
-  { id: "cursor", name: "Cursor", models: CURSOR_MODELS },
-];
diff --git a/src/components/chat/hooks/useChatComposerState.ts b/src/components/chat/hooks/useChatComposerState.ts
index 883a12f5..49b610cc 100644
--- a/src/components/chat/hooks/useChatComposerState.ts
+++ b/src/components/chat/hooks/useChatComposerState.ts
@@ -20,14 +20,13 @@ import type {
   PendingPermissionRequest,
   PermissionMode,
 } from '../types/types';
-import type { Project, ProjectSession, LLMProvider } from '../../../types/app';
+import type { Project, ProjectSession, LLMProvider, ProviderModelsCacheInfo } from '../../../types/app';
 import { escapeRegExp } from '../utils/chatFormatting';
 
 import { useFileMentions } from './useFileMentions';
 import { type SlashCommand, useSlashCommands } from './useSlashCommands';
 
 type PendingViewSession = {
-  sessionId: string | null;
   startedAt: number;
 };
 
@@ -42,6 +41,7 @@ interface UseChatComposerStateArgs {
   claudeModel: string;
   codexModel: string;
   geminiModel: string;
+  opencodeModel: string;
   isLoading: boolean;
   canAbortSession: boolean;
   tokenBudget: Record<string, unknown> | null;
@@ -55,8 +55,6 @@ interface UseChatComposerStateArgs {
   pendingViewSessionRef: { current: PendingViewSession | null };
   scrollToBottom: () => void;
   addMessage: (msg: ChatMessage) => void;
-  clearMessages: () => void;
-  rewindMessages: (count: number) => void;
   setIsLoading: (loading: boolean) => void;
   setCanAbortSession: (canAbort: boolean) => void;
   setClaudeStatus: (status: { text: string; tokens: number; can_interrupt: boolean } | null) => void;
@@ -78,6 +76,76 @@ interface CommandExecutionResult {
   hasFileIncludes?: boolean;
 }
 
+export type ModelCommandData = {
+  current?: {
+    provider?: string;
+    providerLabel?: string;
+    model?: string;
+  };
+  available?: Partial<Record<LLMProvider, string[]>>;
+  availableModels?: string[];
+  availableOptions?: Array<{
+    value: string;
+    label?: string;
+    description?: string;
+  }>;
+  defaultModel?: string;
+  cache?: ProviderModelsCacheInfo;
+};
+
+export type CostCommandData = {
+  tokenUsage?: {
+    used?: number;
+    total?: number;
+    percentage?: number;
+  };
+  cost?: {
+    input?: string;
+    output?: string;
+    total?: string;
+  };
+  tokenBreakdown?: {
+    input?: number;
+    output?: number;
+    cache?: number;
+  };
+  provider?: string;
+  model?: string;
+};
+
+export type StatusCommandData = {
+  version?: string;
+  packageName?: string;
+  uptime?: string;
+  model?: string;
+  provider?: string;
+  nodeVersion?: string;
+  platform?: string;
+  pid?: number;
+  memoryUsage?: {
+    rssMb?: number;
+    heapUsedMb?: number;
+    heapTotalMb?: number;
+  };
+};
+
+export type HelpCommandData = {
+  content?: string;
+  format?: string;
+  commands?: Array<{
+    name: string;
+    description?: string;
+    namespace?: string;
+  }>;
+};
+
+export type CommandModalKind = 'help' | 'models' | 'cost' | 'status';
+
+export type CommandModalPayload = {
+  kind: CommandModalKind;
+  data: HelpCommandData | ModelCommandData | CostCommandData | StatusCommandData;
+};
+
 const createFakeSubmitEvent = () => {
   return { preventDefault: () => undefined } as unknown as FormEvent<HTMLFormElement>;
 };
@@ -111,6 +179,7 @@ export function useChatComposerState({
   claudeModel,
   codexModel,
   geminiModel,
+  opencodeModel,
   isLoading,
   canAbortSession,
   tokenBudget,
@@ -124,8 +193,6 @@ export function useChatComposerState({
   pendingViewSessionRef,
   scrollToBottom,
   addMessage,
-  clearMessages,
-  rewindMessages,
   setIsLoading,
   setCanAbortSession,
   setClaudeStatus,
@@ -145,6 +212,7 @@ export function useChatComposerState({
   const [imageErrors, setImageErrors] = useState<Map<string, string>>(new Map());
   const [isTextareaExpanded, setIsTextareaExpanded] = useState(false);
   const [thinkingMode, setThinkingMode] = useState('none');
+  const [commandModalPayload, setCommandModalPayload] = useState<CommandModalPayload | null>(null);
 
   const textareaRef = useRef<HTMLTextAreaElement>(null);
   const inputHighlightRef = useRef<HTMLDivElement>(null);
@@ -158,35 +226,33 @@ export function useChatComposerState({
     (result: CommandExecutionResult) => {
       const { action, data } = result;
       switch (action) {
-        case 'clear':
-          clearMessages();
-          break;
-
         case 'help':
-          addMessage({
-            type: 'assistant',
-            content: data.content,
-            timestamp: Date.now(),
+          setCommandModalPayload({
+            kind: 'help',
+            data: (data || {}) as HelpCommandData,
           });
           break;
 
-        case 'model':
-          addMessage({
-            type: 'assistant',
-            content: `**Current Model**: ${data.current.model}\n\n**Available Models**:\n\nClaude: ${data.available.claude.join(', ')}\n\nCursor: ${data.available.cursor.join(', ')}`,
-            timestamp: Date.now(),
+        case 'models':
+          setCommandModalPayload({
+            kind: 'models',
+            data: (data || {}) as ModelCommandData,
           });
           break;
 
         case 'cost': {
-          const costMessage = `**Token Usage**: ${data.tokenUsage.used.toLocaleString()} / ${data.tokenUsage.total.toLocaleString()} (${data.tokenUsage.percentage}%)\n\n**Estimated Cost**:\n- Input: $${data.cost.input}\n- Output: $${data.cost.output}\n- **Total**: $${data.cost.total}\n\n**Model**: ${data.model}`;
-          addMessage({ type: 'assistant', content: costMessage, timestamp: Date.now() });
+          setCommandModalPayload({
+            kind: 'cost',
+            data: (data || {}) as CostCommandData,
+          });
           break;
         }
 
         case 'status': {
-          const statusMessage = `**System Status**\n\n- Version: ${data.version}\n- Uptime: ${data.uptime}\n- Model: ${data.model}\n- Provider: ${data.provider}\n- Node.js: ${data.nodeVersion}\n- Platform: ${data.platform}`;
-          addMessage({ type: 'assistant', content: statusMessage, timestamp: Date.now() });
+          setCommandModalPayload({
+            kind: 'status',
+            data: (data || {}) as StatusCommandData,
+          });
           break;
         }
 
@@ -213,30 +279,17 @@ export function useChatComposerState({
           onShowSettings?.();
           break;
 
-        case 'rewind':
-          if (data.error) {
-            addMessage({
-              type: 'assistant',
-              content: `Warning: ${data.message}`,
-              timestamp: Date.now(),
-            });
-          } else {
-            rewindMessages(data.steps * 2);
-            addMessage({
-              type: 'assistant',
-              content: `Rewound ${data.steps} step(s). ${data.message}`,
-              timestamp: Date.now(),
-            });
-          }
-          break;
-
         default:
           console.warn('Unknown built-in command action:', action);
       }
     },
-    [onFileOpen, onShowSettings, addMessage, clearMessages, rewindMessages],
+    [onFileOpen, onShowSettings, addMessage],
   );
 
+  const closeCommandModal = useCallback(() => {
+    setCommandModalPayload(null);
+  }, []);
+
   const handleCustomCommand = useCallback(async (result: CommandExecutionResult) => {
     const { content, hasBashCommands } = result;
 
@@ -285,7 +338,15 @@ export function useChatComposerState({
           projectId: selectedProject.projectId,
           sessionId: currentSessionId,
           provider,
-          model: provider === 'cursor' ? cursorModel : provider === 'codex' ? codexModel : provider === 'gemini' ? geminiModel : claudeModel,
+          model: provider === 'cursor'
+            ? cursorModel
+            : provider === 'codex'
+              ? codexModel
+              : provider === 'gemini'
+                ? geminiModel
+                : provider === 'opencode'
+                  ? opencodeModel
+                  : claudeModel,
           tokenUsage: tokenBudget,
         };
 
@@ -337,6 +398,7 @@ export function useChatComposerState({
       currentSessionId,
       cursorModel,
       geminiModel,
+      opencodeModel,
       handleBuiltInCommand,
       handleCustomCommand,
       input,
@@ -473,13 +535,26 @@ export function useChatComposerState({
       }
 
       // Intercept slash commands only when "/" is the first input character.
+      // Also accept exact "help" as a convenience alias for users who expect CLI-style help.
       const commandInput = currentInput.trimEnd();
-      if (commandInput.startsWith('/')) {
+      const isHelpAlias = commandInput.trim().toLowerCase() === 'help';
+      if (commandInput.startsWith('/') || isHelpAlias) {
         const firstSpace = commandInput.indexOf(' ');
-        const commandName = firstSpace > 0 ? commandInput.slice(0, firstSpace) : commandInput;
-        const matchedCommand = slashCommands.find((cmd: SlashCommand) => cmd.name === commandName);
+        const commandName = isHelpAlias
+          ? '/help'
+          : firstSpace > 0 ? commandInput.slice(0, firstSpace) : commandInput;
+        const matchedCommand =
+          slashCommands.find((cmd: SlashCommand) => cmd.name === commandName) ||
+          (commandName === '/help'
+            ? ({
+                name: '/help',
+                description: 'Show help documentation for Claude Code',
+                namespace: 'builtin',
+                metadata: { type: 'builtin' },
+              } as SlashCommand)
+            : undefined);
         if (matchedCommand && matchedCommand.type !== 'skill') {
-          executeCommand(matchedCommand, commandInput);
+          executeCommand(matchedCommand, isHelpAlias ? '/help' : commandInput);
           setInput('');
           inputValueRef.current = '';
           setAttachedImages([]);
@@ -555,13 +630,9 @@ export function useChatComposerState({
       setTimeout(() => scrollToBottom(), 100);
 
       if (!effectiveSessionId && !selectedSession?.id) {
-        if (typeof window !== 'undefined') {
-          // Reset stale pending IDs from previous interrupted runs before creating a new one.
-          sessionStorage.removeItem('pendingSessionId');
-        }
-        // For new sessions we intentionally keep this as `null` until the backend
-        // emits `session_created` with the canonical provider session id.
-        pendingViewSessionRef.current = { sessionId: null, startedAt: Date.now() };
+        // This tracks only that a request is in flight before the provider has
+        // emitted its real session id; routing still waits for session_created.
+        pendingViewSessionRef.current = { startedAt: Date.now() };
       }
       if (effectiveSessionId) {
         onSessionActive?.(effectiveSessionId);
@@ -577,6 +648,8 @@ export function useChatComposerState({
                 ? 'codex-settings'
                 : provider === 'gemini'
                   ? 'gemini-settings'
+                  : provider === 'opencode'
+                    ? 'opencode-settings'
                   : 'claude-settings';
           const savedSettings = safeLocalStorage.getItem(settingsKey);
           if (savedSettings) {
@@ -644,6 +717,20 @@ export function useChatComposerState({
             toolsSettings,
           },
         });
+      } else if (provider === 'opencode') {
+        sendMessage({
+          type: 'opencode-command',
+          command: messageContent,
+          sessionId: effectiveSessionId,
+          options: {
+            cwd: resolvedProjectPath,
+            projectPath: resolvedProjectPath,
+            sessionId: effectiveSessionId,
+            resume: Boolean(effectiveSessionId),
+            model: opencodeModel,
+            sessionSummary,
+          },
+        });
       } else {
         sendMessage({
           type: 'claude-command',
@@ -686,6 +773,7 @@ export function useChatComposerState({
       cursorModel,
       executeCommand,
       geminiModel,
+      opencodeModel,
       isLoading,
       onSessionActive,
       onSessionProcessing,
@@ -856,15 +944,11 @@ export function useChatComposerState({
       return;
     }
 
-    const pendingSessionId =
-      typeof window !== 'undefined' ? sessionStorage.getItem('pendingSessionId') : null;
     const cursorSessionId =
       typeof window !== 'undefined' ? sessionStorage.getItem('cursorSessionId') : null;
 
     const candidateSessionIds = [
       currentSessionId,
-      pendingViewSessionRef.current?.sessionId || null,
-      pendingSessionId,
       provider === 'cursor' ? cursorSessionId : null,
       selectedSession?.id || null,
     ];
@@ -882,7 +966,7 @@ export function useChatComposerState({
       sessionId: targetSessionId,
       provider,
     });
-  }, [canAbortSession, currentSessionId, pendingViewSessionRef, provider, selectedSession?.id, sendMessage]);
+  }, [canAbortSession, currentSessionId, provider, selectedSession?.id, sendMessage]);
 
   const handleGrantToolPermission = useCallback(
     (suggestion: { entry: string; toolName: string }) => {
@@ -980,5 +1064,7 @@ export function useChatComposerState({
     handleGrantToolPermission,
     handleInputFocusChange,
     isInputFocused,
+    commandModalPayload,
+    closeCommandModal,
   };
 }
diff --git a/src/components/chat/hooks/useChatProviderState.ts b/src/components/chat/hooks/useChatProviderState.ts
index 7842ecb7..33c54d4b 100644
--- a/src/components/chat/hooks/useChatProviderState.ts
+++ b/src/components/chat/hooks/useChatProviderState.ts
@@ -1,8 +1,21 @@
 import { useCallback, useEffect, useRef, useState } from 'react';
 import { authenticatedFetch } from '../../../utils/api';
-import { CLAUDE_MODELS, CODEX_MODELS, CURSOR_MODELS, GEMINI_MODELS } from '../../../../shared/modelConstants';
 import type { PendingPermissionRequest, PermissionMode } from '../types/types';
-import type { ProjectSession, LLMProvider } from '../../../types/app';
+import type {
+  ProjectSession,
+  LLMProvider,
+  Project,
+  ProviderModelsCacheInfo,
+  ProviderModelsDefinition,
+} from '../../../types/app';
+
+const FALLBACK_DEFAULT_MODEL: Record<LLMProvider, string> = {
+  claude: 'opus',
+  cursor: 'gpt-5.3-codex',
+  codex: 'gpt-5.4',
+  gemini: 'gemini-3.1-pro-preview',
+  opencode: 'anthropic/claude-sonnet-4-5',
+};
 
 const getPermissionModesForProvider = (provider: LLMProvider): PermissionMode[] => {
   if (provider === 'codex') {
@@ -11,33 +24,242 @@ const getPermissionModesForProvider = (provider: LLMProvider): PermissionMode[]
   if (provider === 'claude') {
     return ['default', 'auto', 'acceptEdits', 'bypassPermissions', 'plan'];
   }
+  if (provider === 'opencode') {
+    return ['default'];
+  }
   return ['default', 'acceptEdits', 'bypassPermissions', 'plan'];
 };
 
 interface UseChatProviderStateArgs {
   selectedSession: ProjectSession | null;
+  selectedProject: Project | null;
 }
 
-export function useChatProviderState({ selectedSession }: UseChatProviderStateArgs) {
+type ProviderModelsApiResponse = {
+  success?: boolean;
+  data?: {
+    models?: ProviderModelsDefinition;
+    cache?: ProviderModelsCacheInfo;
+  };
+};
+
+type ChangeActiveModelApiResponse = {
+  success?: boolean;
+  data?: {
+    provider?: LLMProvider;
+    sessionId?: string;
+    supported?: boolean;
+    changed?: boolean;
+    model?: string | null;
+  };
+};
+
+export function useChatProviderState({ selectedSession, selectedProject }: UseChatProviderStateArgs) {
   const [permissionMode, setPermissionMode] = useState<PermissionMode>('default');
   const [pendingPermissionRequests, setPendingPermissionRequests] = useState<PendingPermissionRequest[]>([]);
   const [provider, setProvider] = useState<LLMProvider>(() => {
     return (localStorage.getItem('selected-provider') as LLMProvider) || 'claude';
   });
   const [cursorModel, setCursorModel] = useState<string>(() => {
-    return localStorage.getItem('cursor-model') || CURSOR_MODELS.DEFAULT;
+    return localStorage.getItem('cursor-model') || FALLBACK_DEFAULT_MODEL.cursor;
   });
   const [claudeModel, setClaudeModel] = useState<string>(() => {
-    return localStorage.getItem('claude-model') || CLAUDE_MODELS.DEFAULT;
+    return localStorage.getItem('claude-model') || FALLBACK_DEFAULT_MODEL.claude;
   });
   const [codexModel, setCodexModel] = useState<string>(() => {
-    return localStorage.getItem('codex-model') || CODEX_MODELS.DEFAULT;
+    return localStorage.getItem('codex-model') || FALLBACK_DEFAULT_MODEL.codex;
   });
   const [geminiModel, setGeminiModel] = useState<string>(() => {
-    return localStorage.getItem('gemini-model') || GEMINI_MODELS.DEFAULT;
+    return localStorage.getItem('gemini-model') || FALLBACK_DEFAULT_MODEL.gemini;
+  });
+  const [opencodeModel, setOpenCodeModel] = useState<string>(() => {
+    return localStorage.getItem('opencode-model') || FALLBACK_DEFAULT_MODEL.opencode;
   });
 
+  const [providerModelCatalog, setProviderModelCatalog] = useState<
+    Partial<Record<LLMProvider, ProviderModelsDefinition>>
+  >({});
+  const [providerModelCacheCatalog, setProviderModelCacheCatalog] = useState<
+    Partial<Record<LLMProvider, ProviderModelsCacheInfo>>
+  >({});
+  const [providerModelsLoading, setProviderModelsLoading] = useState(true);
+  const [providerModelsRefreshing, setProviderModelsRefreshing] = useState(false);
+
   const lastProviderRef = useRef(provider);
+  const providerModelsRequestIdRef = useRef(0);
+
+  const setStoredProviderModel = useCallback((targetProvider: LLMProvider, model: string) => {
+    if (targetProvider === 'claude') {
+      setClaudeModel(model);
+      localStorage.setItem('claude-model', model);
+      return;
+    }
+
+    if (targetProvider === 'cursor') {
+      setCursorModel(model);
+      localStorage.setItem('cursor-model', model);
+      return;
+    }
+
+    if (targetProvider === 'codex') {
+      setCodexModel(model);
+      localStorage.setItem('codex-model', model);
+      return;
+    }
+
+    if (targetProvider === 'gemini') {
+      setGeminiModel(model);
+      localStorage.setItem('gemini-model', model);
+      return;
+    }
+
+    setOpenCodeModel(model);
+    localStorage.setItem('opencode-model', model);
+  }, []);
+
+  const loadProviderModels = useCallback(async (options: { bypassCache?: boolean } = {}) => {
+    const providers: LLMProvider[] = ['claude', 'cursor', 'codex', 'gemini', 'opencode'];
+    const requestId = providerModelsRequestIdRef.current + 1;
+    providerModelsRequestIdRef.current = requestId;
+    const isHardRefresh = options.bypassCache === true;
+
+    if (isHardRefresh) {
+      setProviderModelsRefreshing(true);
+    } else {
+      setProviderModelsLoading(true);
+    }
+
+    try {
+      const results = await Promise.all(
+        providers.map(async (p) => {
+          const params = new URLSearchParams();
+          if (options.bypassCache) {
+            params.set('bypassCache', 'true');
+          }
+
+          const queryString = params.toString();
+          const response = await authenticatedFetch(`/api/providers/${p}/models${queryString ? `?${queryString}` : ''}`);
+          const body = (await response.json()) as ProviderModelsApiResponse;
+          if (!body.success || !body.data?.models || !body.data?.cache) {
+            return null;
+          }
+
+          return body.data;
+        }),
+      );
+
+      if (providerModelsRequestIdRef.current !== requestId) {
+        return;
+      }
+
+      const nextCatalog: Partial<Record<LLMProvider, ProviderModelsDefinition>> = {};
+      const nextCacheCatalog: Partial<Record<LLMProvider, ProviderModelsCacheInfo>> = {};
+
+      providers.forEach((p, i) => {
+        const entry = results[i];
+        if (!entry) {
+          return;
+        }
+
+        nextCatalog[p] = entry.models;
+        nextCacheCatalog[p] = entry.cache;
+      });
+
+      setProviderModelCatalog(nextCatalog);
+      setProviderModelCacheCatalog(nextCacheCatalog);
+    } catch (error) {
+      console.error('Error loading provider models:', error);
+    } finally {
+      if (providerModelsRequestIdRef.current === requestId) {
+        setProviderModelsLoading(false);
+        setProviderModelsRefreshing(false);
+      }
+    }
+  }, []);
+
+  useEffect(() => {
+    void loadProviderModels();
+  }, [loadProviderModels]);
+
+  const pickStoredOrCurrent = (
+    storageKey: string,
+    current: string,
+    def: ProviderModelsDefinition,
+  ): string => {
+    const stored = localStorage.getItem(storageKey);
+    if (stored && def.OPTIONS.some((o) => o.value === stored)) {
+      return stored;
+    }
+    if (current && def.OPTIONS.some((o) => o.value === current)) {
+      return current;
+    }
+    return def.DEFAULT;
+  };
+
+  useEffect(() => {
+    const claude = providerModelCatalog.claude;
+    if (claude) {
+      const next = pickStoredOrCurrent('claude-model', claudeModel, claude);
+      if (next !== claudeModel) {
+        setClaudeModel(next);
+      }
+      if (localStorage.getItem('claude-model') !== next) {
+        localStorage.setItem('claude-model', next);
+      }
+    }
+  }, [providerModelCatalog.claude, claudeModel]);
+
+  useEffect(() => {
+    const cursor = providerModelCatalog.cursor;
+    if (cursor) {
+      const next = pickStoredOrCurrent('cursor-model', cursorModel, cursor);
+      if (next !== cursorModel) {
+        setCursorModel(next);
+      }
+      if (localStorage.getItem('cursor-model') !== next) {
+        localStorage.setItem('cursor-model', next);
+      }
+    }
+  }, [providerModelCatalog.cursor, cursorModel]);
+
+  useEffect(() => {
+    const codex = providerModelCatalog.codex;
+    if (codex) {
+      const next = pickStoredOrCurrent('codex-model', codexModel, codex);
+      if (next !== codexModel) {
+        setCodexModel(next);
+      }
+      if (localStorage.getItem('codex-model') !== next) {
+        localStorage.setItem('codex-model', next);
+      }
+    }
+  }, [providerModelCatalog.codex, codexModel]);
+
+  useEffect(() => {
+    const gemini = providerModelCatalog.gemini;
+    if (gemini) {
+      const next = pickStoredOrCurrent('gemini-model', geminiModel, gemini);
+      if (next !== geminiModel) {
+        setGeminiModel(next);
+      }
+      if (localStorage.getItem('gemini-model') !== next) {
+        localStorage.setItem('gemini-model', next);
+      }
+    }
+  }, [providerModelCatalog.gemini, geminiModel]);
+
+  useEffect(() => {
+    const opencode = providerModelCatalog.opencode;
+    if (opencode) {
+      const next = pickStoredOrCurrent('opencode-model', opencodeModel, opencode);
+      if (next !== opencodeModel) {
+        setOpenCodeModel(next);
+      }
+      if (localStorage.getItem('opencode-model') !== next) {
+        localStorage.setItem('opencode-model', next);
+      }
+    }
+  }, [providerModelCatalog.opencode, opencodeModel]);
 
   useEffect(() => {
     if (!selectedSession?.id) {
@@ -107,6 +329,41 @@ export function useChatProviderState({ selectedSession }: UseChatProviderStateAr
     }
   }, [permissionMode, provider, selectedSession?.id]);
 
+  const selectProviderModel = useCallback(async (
+    targetProvider: LLMProvider,
+    model: string,
+    sessionId?: string | null,
+  ) => {
+    const normalizedSessionId = typeof sessionId === 'string' ? sessionId.trim() : '';
+    if (!normalizedSessionId) {
+      setStoredProviderModel(targetProvider, model);
+      return {
+        scope: 'default' as const,
+        changed: false,
+        model,
+      };
+    }
+
+    const response = await authenticatedFetch(
+      `/api/providers/${targetProvider}/sessions/${encodeURIComponent(normalizedSessionId)}/active-model`,
+      {
+        method: 'POST',
+        body: JSON.stringify({ model }),
+      },
+    );
+
+    const body = (await response.json()) as ChangeActiveModelApiResponse;
+    if (!response.ok || !body.success || !body.data?.supported) {
+      throw new Error('Unable to change the active model for this session.');
+    }
+
+    return {
+      scope: 'session' as const,
+      changed: body.data.changed === true,
+      model: body.data.model || model,
+    };
+  }, [setStoredProviderModel]);
+
   return {
     provider,
     setProvider,
@@ -118,10 +375,18 @@ export function useChatProviderState({ selectedSession }: UseChatProviderStateAr
     setCodexModel,
     geminiModel,
     setGeminiModel,
+    opencodeModel,
+    setOpenCodeModel,
     permissionMode,
     setPermissionMode,
     pendingPermissionRequests,
     setPendingPermissionRequests,
     cyclePermissionMode,
+    providerModelCatalog,
+    providerModelCacheCatalog,
+    providerModelsLoading,
+    providerModelsRefreshing,
+    hardRefreshProviderModels: () => loadProviderModels({ bypassCache: true }),
+    selectProviderModel,
   };
 }
diff --git a/src/components/chat/hooks/useChatRealtimeHandlers.ts b/src/components/chat/hooks/useChatRealtimeHandlers.ts
index 86c85469..6a5a1b81 100644
--- a/src/components/chat/hooks/useChatRealtimeHandlers.ts
+++ b/src/components/chat/hooks/useChatRealtimeHandlers.ts
@@ -7,7 +7,6 @@ import type { ProjectSession, LLMProvider } from '../../../types/app';
 import type { SessionStore, NormalizedMessage } from '../../../stores/useSessionStore';
 
 type PendingViewSession = {
-  sessionId: string | null;
   startedAt: number;
 };
 
@@ -63,6 +62,7 @@ interface UseChatRealtimeHandlersArgs {
   streamTimerRef: MutableRefObject<number | null>;
   accumulatedStreamRef: MutableRefObject<string>;
   onSessionInactive?: (sessionId?: string | null) => void;
+  onSessionActive?: (sessionId?: string | null) => void;
   onSessionProcessing?: (sessionId?: string | null) => void;
   onSessionNotProcessing?: (sessionId?: string | null) => void;
   onNavigateToSession?: (sessionId: string, options?: SessionNavigationOptions) => void;
@@ -89,6 +89,7 @@ export function useChatRealtimeHandlers({
   streamTimerRef,
   accumulatedStreamRef,
   onSessionInactive,
+  onSessionActive,
   onSessionProcessing,
   onSessionNotProcessing,
   onNavigateToSession,
@@ -104,7 +105,7 @@ export function useChatRealtimeHandlers({
     lastProcessedMessageRef.current = latestMessage;
 
     const activeViewSessionId =
-      selectedSession?.id || currentSessionId || pendingViewSessionRef.current?.sessionId || null;
+      selectedSession?.id || currentSessionId || null;
 
     /* ---------------------------------------------------------------- */
     /*  Legacy messages (no `kind` field) — handle and return           */
@@ -151,10 +152,12 @@ export function useChatRealtimeHandlers({
             statusSessionId === currentSessionId || (selectedSession && statusSessionId === selectedSession.id);
 
           if (msg.isProcessing) {
+            onSessionActive?.(statusSessionId);
             onSessionProcessing?.(statusSessionId);
             if (isCurrentSession) { setIsLoading(true); setCanAbortSession(true); }
             return;
           }
+
           onSessionInactive?.(statusSessionId);
           onSessionNotProcessing?.(statusSessionId);
           if (isCurrentSession) {
@@ -235,15 +238,21 @@ export function useChatRealtimeHandlers({
         if (!currentSessionId) {
           console.log('Session created with ID:', newSessionId);
           console.log('Existing session ID:', currentSessionId);
-          sessionStorage.setItem('pendingSessionId', newSessionId);
-          if (pendingViewSessionRef.current && !pendingViewSessionRef.current.sessionId) {
-            pendingViewSessionRef.current.sessionId = newSessionId;
-          }
           setCurrentSessionId(newSessionId);
           setPendingPermissionRequests((prev) =>
             prev.map((r) => (r.sessionId ? r : { ...r, sessionId: newSessionId })),
           );
         }
+        pendingViewSessionRef.current = null;
+        onSessionActive?.(newSessionId);
+        onSessionProcessing?.(newSessionId);
+        setIsLoading(true);
+        setCanAbortSession(true);
+        setClaudeStatus({
+          text: 'Processing',
+          tokens: 0,
+          can_interrupt: true,
+        });
         onNavigateToSession?.(newSessionId);
         break;
       }
@@ -266,6 +275,7 @@ export function useChatRealtimeHandlers({
         setPendingPermissionRequests([]);
         onSessionInactive?.(sid);
         onSessionNotProcessing?.(sid);
+        pendingViewSessionRef.current = null;
 
         // Handle aborted case
         if (msg.aborted) {
@@ -279,16 +289,10 @@ export function useChatRealtimeHandlers({
           typeof msg.actualSessionId === 'string' && msg.actualSessionId.trim().length > 0
             ? msg.actualSessionId
             : null;
-        const pendingSessionId = sessionStorage.getItem('pendingSessionId');
-        const completedSuccessfully = msg.exitCode === undefined || msg.exitCode === 0;
         const isVisibleSession =
           Boolean(
             sid
-            && (
-              sid === activeViewSessionId
-              || sid === pendingSessionId
-              || pendingViewSessionRef.current?.sessionId === sid
-            ),
+            && sid === activeViewSessionId,
           );
 
         if (actualSessionId && sid && actualSessionId !== sid) {
@@ -296,17 +300,6 @@ export function useChatRealtimeHandlers({
 
           if (isVisibleSession) {
             setCurrentSessionId(actualSessionId);
-
-            if (pendingViewSessionRef.current) {
-              const pendingSession = pendingViewSessionRef.current.sessionId;
-              if (!pendingSession || pendingSession === sid) {
-                pendingViewSessionRef.current.sessionId = actualSessionId;
-              }
-            }
-          }
-
-          if (completedSuccessfully && pendingSessionId === sid) {
-            sessionStorage.removeItem('pendingSessionId');
           }
 
           if (isVisibleSession) {
@@ -316,16 +309,6 @@ export function useChatRealtimeHandlers({
           break;
         }
 
-        // Clear pending session
-        if (pendingSessionId && !currentSessionId && completedSuccessfully) {
-          const resolvedSessionId = actualSessionId || pendingSessionId;
-          setCurrentSessionId(resolvedSessionId);
-          if (actualSessionId) {
-            onNavigateToSession?.(resolvedSessionId, { replace: true });
-          }
-          sessionStorage.removeItem('pendingSessionId');
-          setTimeout(() => { void paletteOps.refreshProjects(); }, 500);
-        }
         break;
       }
 
@@ -335,6 +318,7 @@ export function useChatRealtimeHandlers({
         setClaudeStatus(null);
         onSessionInactive?.(sid);
         onSessionNotProcessing?.(sid);
+        pendingViewSessionRef.current = null;
         break;
       }
 
@@ -399,6 +383,7 @@ export function useChatRealtimeHandlers({
     streamTimerRef,
     accumulatedStreamRef,
     onSessionInactive,
+    onSessionActive,
     onSessionProcessing,
     onSessionNotProcessing,
     onNavigateToSession,
diff --git a/src/components/chat/hooks/useChatSessionState.ts b/src/components/chat/hooks/useChatSessionState.ts
index 95278ffd..b96e6646 100644
--- a/src/components/chat/hooks/useChatSessionState.ts
+++ b/src/components/chat/hooks/useChatSessionState.ts
@@ -13,7 +13,6 @@ const MESSAGES_PER_PAGE = 20;
 const INITIAL_VISIBLE_MESSAGES = 100;
 
 type PendingViewSession = {
-  sessionId: string | null;
   startedAt: number;
 };
 
@@ -160,7 +159,7 @@ export function useChatSessionState({
      * Why this is essential:
      * - Chat keeps local state that is not fully derived from `selectedSession`:
      *   `currentSessionId`, `pendingUserMessage`, streaming/status flags, message
-     *   pagination/scroll bookkeeping, and pending session IDs in sessionStorage.
+     *   pagination/scroll bookkeeping, and provider-specific sessionStorage keys.
      * - If the user clicks New Session while already on the same route with no
      *   selected session, parent state updates can be idempotent and this local
      *   state would otherwise persist, making the click appear to "do nothing".
@@ -177,7 +176,6 @@ export function useChatSessionState({
     setIsLoading(false);
     setCurrentSessionId(null);
     setPendingUserMessage(null);
-    sessionStorage.removeItem('pendingSessionId');
     sessionStorage.removeItem('cursorSessionId');
     messagesOffsetRef.current = 0;
     setHasMoreMessages(false);
@@ -396,6 +394,12 @@ export function useChatSessionState({
   // Main session loading effect — store-based
   useEffect(() => {
     if (!selectedSession || !selectedProject) {
+      // A new provider run can be in flight before the router has a canonical
+      // selectedSession. Keep the processing banner alive until complete/error.
+      if (pendingViewSessionRef.current) {
+        return;
+      }
+
       resetStreamingState();
       pendingViewSessionRef.current = null;
       setClaudeStatus(null);
@@ -537,10 +541,6 @@ export function useChatSessionState({
     }
   }, [selectedSession]);
 
-  useEffect(() => {
-    if (selectedSession?.id) pendingViewSessionRef.current = null;
-  }, [pendingViewSessionRef, selectedSession?.id]);
-
   // Scroll to search target
   useEffect(() => {
     if (!searchTarget || chatMessages.length === 0 || isLoadingSessionMessages) return;
diff --git a/src/components/chat/view/ChatInterface.tsx b/src/components/chat/view/ChatInterface.tsx
index 2bff948d..2f677bbb 100644
--- a/src/components/chat/view/ChatInterface.tsx
+++ b/src/components/chat/view/ChatInterface.tsx
@@ -14,10 +14,10 @@ import { useSessionStore } from '../../../stores/useSessionStore';
 
 import ChatMessagesPane from './subcomponents/ChatMessagesPane';
 import ChatComposer from './subcomponents/ChatComposer';
+import CommandResultModal from './subcomponents/CommandResultModal';
 
 
 type PendingViewSession = {
-  sessionId: string | null;
   startedAt: number;
 };
 
@@ -72,19 +72,26 @@ function ChatInterface({
     setCodexModel,
     geminiModel,
     setGeminiModel,
+    opencodeModel,
+    setOpenCodeModel,
     permissionMode,
     pendingPermissionRequests,
     setPendingPermissionRequests,
     cyclePermissionMode,
+    providerModelCatalog,
+    providerModelCacheCatalog,
+    providerModelsLoading,
+    providerModelsRefreshing,
+    hardRefreshProviderModels,
+    selectProviderModel,
   } = useChatProviderState({
     selectedSession,
+    selectedProject,
   });
 
   const {
     chatMessages,
     addMessage,
-    clearMessages,
-    rewindMessages,
     isLoading,
     setIsLoading,
     currentSessionId,
@@ -170,7 +177,9 @@ function ChatInterface({
     handlePermissionDecision,
     handleGrantToolPermission,
     handleInputFocusChange,
-    isInputFocused,
+    isInputFocused: _isInputFocused,
+    commandModalPayload,
+    closeCommandModal,
   } = useChatComposerState({
     selectedProject,
     selectedSession,
@@ -182,6 +191,7 @@ function ChatInterface({
     claudeModel,
     codexModel,
     geminiModel,
+    opencodeModel,
     isLoading,
     canAbortSession,
     tokenBudget,
@@ -195,8 +205,6 @@ function ChatInterface({
     pendingViewSessionRef,
     scrollToBottom,
     addMessage,
-    clearMessages,
-    rewindMessages,
     setIsLoading,
     setCanAbortSession,
     setClaudeStatus,
@@ -234,6 +242,7 @@ function ChatInterface({
     streamTimerRef,
     accumulatedStreamRef,
     onSessionInactive,
+    onSessionActive,
     onSessionProcessing,
     onSessionNotProcessing,
     onNavigateToSession,
@@ -280,6 +289,8 @@ function ChatInterface({
           ? t('messageTypes.codex')
           : provider === 'gemini'
             ? t('messageTypes.gemini')
+            : provider === 'opencode'
+              ? t('messageTypes.opencode', { defaultValue: 'OpenCode' })
             : t('messageTypes.claude');
 
     return (
@@ -318,6 +329,10 @@ function ChatInterface({
           setCodexModel={setCodexModel}
           geminiModel={geminiModel}
           setGeminiModel={setGeminiModel}
+          opencodeModel={opencodeModel}
+          setOpenCodeModel={setOpenCodeModel}
+          providerModelCatalog={providerModelCatalog}
+          providerModelsLoading={providerModelsLoading}
           tasksEnabled={tasksEnabled}
           isTaskMasterInstalled={isTaskMasterInstalled}
           onShowAllTasks={onShowAllTasks}
@@ -406,6 +421,8 @@ function ChatInterface({
                   ? t('messageTypes.codex')
                   : provider === 'gemini'
                     ? t('messageTypes.gemini')
+                    : provider === 'opencode'
+                      ? t('messageTypes.opencode', { defaultValue: 'OpenCode' })
                     : t('messageTypes.claude'),
           })}
           isTextareaExpanded={isTextareaExpanded}
@@ -414,6 +431,17 @@ function ChatInterface({
       </div>
 
       <QuickSettingsPanel />
+
+      <CommandResultModal
+        payload={commandModalPayload}
+        onClose={closeCommandModal}
+        providerModelCatalog={providerModelCatalog}
+        providerModelCacheCatalog={providerModelCacheCatalog}
+        providerModelsRefreshing={providerModelsRefreshing}
+        onHardRefreshProviderModels={hardRefreshProviderModels}
+        currentSessionId={currentSessionId || selectedSession?.id || null}
+        onSelectProviderModel={selectProviderModel}
+      />
     </PermissionContext.Provider>
   );
 }
diff --git a/src/components/chat/view/subcomponents/ChatMessagesPane.tsx b/src/components/chat/view/subcomponents/ChatMessagesPane.tsx
index 0129195a..f4ba1161 100644
--- a/src/components/chat/view/subcomponents/ChatMessagesPane.tsx
+++ b/src/components/chat/view/subcomponents/ChatMessagesPane.tsx
@@ -1,9 +1,16 @@
 import { useTranslation } from 'react-i18next';
 import { useCallback, useRef } from 'react';
 import type { Dispatch, RefObject, SetStateAction } from 'react';
+
 import type { ChatMessage } from '../../types/types';
-import type { Project, ProjectSession, LLMProvider } from '../../../../types/app';
+import type {
+  Project,
+  ProjectSession,
+  LLMProvider,
+  ProviderModelsDefinition,
+} from '../../../../types/app';
 import { getIntrinsicMessageKey } from '../../utils/messageKeys';
+
 import MessageComponent from './MessageComponent';
 import ProviderSelectionEmptyState from './ProviderSelectionEmptyState';
 
@@ -26,6 +33,10 @@ interface ChatMessagesPaneProps {
   setCodexModel: (model: string) => void;
   geminiModel: string;
   setGeminiModel: (model: string) => void;
+  opencodeModel: string;
+  setOpenCodeModel: (model: string) => void;
+  providerModelCatalog: Partial<Record<LLMProvider, ProviderModelsDefinition>>;
+  providerModelsLoading: boolean;
   tasksEnabled: boolean;
   isTaskMasterInstalled: boolean | null;
   onShowAllTasks?: (() => void) | null;
@@ -71,6 +82,10 @@ export default function ChatMessagesPane({
   setCodexModel,
   geminiModel,
   setGeminiModel,
+  opencodeModel,
+  setOpenCodeModel,
+  providerModelCatalog,
+  providerModelsLoading,
   tasksEnabled,
   isTaskMasterInstalled,
   onShowAllTasks,
@@ -154,6 +169,10 @@ export default function ChatMessagesPane({
           setCodexModel={setCodexModel}
           geminiModel={geminiModel}
           setGeminiModel={setGeminiModel}
+          opencodeModel={opencodeModel}
+          setOpenCodeModel={setOpenCodeModel}
+          providerModelCatalog={providerModelCatalog}
+          providerModelsLoading={providerModelsLoading}
           tasksEnabled={tasksEnabled}
           isTaskMasterInstalled={isTaskMasterInstalled}
           onShowAllTasks={onShowAllTasks}
diff --git a/src/components/chat/view/subcomponents/ClaudeStatus.tsx b/src/components/chat/view/subcomponents/ClaudeStatus.tsx
index f42e29cf..4640ffbc 100644
--- a/src/components/chat/view/subcomponents/ClaudeStatus.tsx
+++ b/src/components/chat/view/subcomponents/ClaudeStatus.tsx
@@ -29,6 +29,7 @@ const PROVIDER_LABEL_KEYS: Record<string, string> = {
   codex: 'messageTypes.codex',
   cursor: 'messageTypes.cursor',
   gemini: 'messageTypes.gemini',
+  opencode: 'messageTypes.opencode',
 };
 
 function formatElapsedTime(totalSeconds: number) {
@@ -126,4 +127,4 @@ export default function ClaudeStatus({
       </div>
     </div>
   );
-}
\ No newline at end of file
+}
diff --git a/src/components/chat/view/subcomponents/CommandResultModal.tsx b/src/components/chat/view/subcomponents/CommandResultModal.tsx
new file mode 100644
index 00000000..9ee66224
--- /dev/null
+++ b/src/components/chat/view/subcomponents/CommandResultModal.tsx
@@ -0,0 +1,731 @@
+import { useMemo, useState } from 'react';
+import {
+  Activity,
+  BadgeCheck,
+  Check,
+  CircleHelp,
+  Clipboard,
+  Coins,
+  Command as CommandIcon,
+  Cpu,
+  Gauge,
+  Package,
+  Search,
+  Server,
+  Sparkles,
+  TerminalSquare,
+  Timer,
+  RefreshCw,
+  X,
+  Zap,
+} from 'lucide-react';
+
+import { Badge, Button, Dialog, DialogContent, DialogTitle, Input } from '../../../../shared/view/ui';
+import type { LLMProvider, ProviderModelsCacheInfo, ProviderModelsDefinition } from '../../../../types/app';
+import type {
+  CommandModalPayload,
+  CostCommandData,
+  HelpCommandData,
+  ModelCommandData,
+  StatusCommandData,
+} from '../../hooks/useChatComposerState';
+
+type CommandResultModalProps = {
+  payload: CommandModalPayload | null;
+  onClose: () => void;
+  providerModelCatalog: Partial<Record<LLMProvider, ProviderModelsDefinition>>;
+  providerModelCacheCatalog: Partial<Record<LLMProvider, ProviderModelsCacheInfo>>;
+  providerModelsRefreshing: boolean;
+  onHardRefreshProviderModels: () => void;
+  currentSessionId: string | null;
+  onSelectProviderModel: (
+    provider: LLMProvider,
+    model: string,
+    sessionId?: string | null,
+  ) => Promise<{
+    scope: 'default' | 'session';
+    changed: boolean;
+    model: string;
+  }>;
+};
+
+type CommandEntry = {
+  name: string;
+  description?: string;
+  namespace?: string;
+};
+
+type ModelOption = {
+  value: string;
+  label?: string;
+  description?: string;
+};
+
+const formatUpdatedAt = (value?: string) => {
+  if (!value) {
+    return 'Not cached yet';
+  }
+
+  const parsed = new Date(value);
+  if (Number.isNaN(parsed.getTime())) {
+    return 'Not cached yet';
+  }
+
+  return parsed.toLocaleString();
+};
+
+const PROVIDER_LABELS: Record<string, string> = {
+  claude: 'Claude',
+  cursor: 'Cursor',
+  codex: 'Codex',
+  gemini: 'Gemini',
+  opencode: 'OpenCode',
+};
+
+const FALLBACK_COMMANDS: CommandEntry[] = [
+  { name: '/models', description: 'Browse available models for the active provider.' },
+  { name: '/cost', description: 'Review context usage and estimated token spend.' },
+  { name: '/status', description: 'Inspect runtime, version, provider, and environment status.' },
+  { name: '/memory', description: 'Open the project CLAUDE.md memory file.' },
+  { name: '/config', description: 'Open settings and configuration.' },
+  { name: '/help', description: 'Show command documentation and syntax.' },
+];
+
+const getProviderLabel = (provider: string | undefined, fallback = 'Unknown') => {
+  if (!provider) {
+    return fallback;
+  }
+
+  return PROVIDER_LABELS[provider] || provider;
+};
+
+const clampPercentage = (value: number) => {
+  if (!Number.isFinite(value)) {
+    return 0;
+  }
+  return Math.max(0, Math.min(100, value));
+};
+
+const formatNumber = (value: number) => {
+  if (!Number.isFinite(value)) {
+    return '0';
+  }
+  return value.toLocaleString();
+};
+
+const formatCurrency = (value: number | string | undefined) => {
+  const numeric = Number(value ?? 0);
+  return `$${Number.isFinite(numeric) ? numeric.toFixed(4) : '0.0000'}`;
+};
+
+function MetricCard({
+  label,
+  value,
+  icon: Icon,
+  tone = 'neutral',
+  compact = false,
+}: {
+  label: string;
+  value: string;
+  icon: typeof Activity;
+  tone?: 'neutral' | 'primary' | 'success';
+  compact?: boolean;
+}) {
+  const toneClass =
+    tone === 'primary'
+      ? 'border-primary/35 bg-primary/10 text-primary'
+      : tone === 'success'
+        ? 'border-emerald-500/30 bg-emerald-500/10 text-emerald-600 dark:text-emerald-300'
+        : 'border-border/70 bg-background/75 text-muted-foreground';
+
+  return (
+    <div
+      className={`group rounded-2xl border border-border/70 bg-background/75 shadow-sm transition-all duration-200 hover:-translate-y-0.5 hover:border-primary/25 hover:shadow-md ${
+        compact ? 'p-3' : 'p-4'
+      }`}
+    >
+      <div className={`inline-flex rounded-xl border ${compact ? 'mb-2 p-1.5' : 'mb-3 p-2'} ${toneClass}`}>
+        <Icon className={compact ? 'h-3.5 w-3.5' : 'h-4 w-4'} />
+      </div>
+      <p className="text-[11px] font-semibold uppercase tracking-[0.18em] text-muted-foreground">{label}</p>
+      <p className={`${compact ? 'mt-0.5 text-[13px]' : 'mt-1 text-sm'} break-all font-semibold text-foreground`}>{value}</p>
+    </div>
+  );
+}
+
+function SearchField({
+  value,
+  onChange,
+  placeholder,
+}: {
+  value: string;
+  onChange: (value: string) => void;
+  placeholder: string;
+}) {
+  return (
+    <div className="relative">
+      <Search className="pointer-events-none absolute left-3 top-1/2 h-4 w-4 -translate-y-1/2 text-muted-foreground" />
+      <Input
+        value={value}
+        onChange={(event) => onChange(event.target.value)}
+        placeholder={placeholder}
+        className="h-10 rounded-xl border-border/70 bg-background/75 pl-9 pr-3 shadow-none focus-visible:ring-primary/40"
+      />
+    </div>
+  );
+}
+
+function HelpContent({ data }: { data: HelpCommandData }) {
+  const [query, setQuery] = useState('');
+  const commands = (Array.isArray(data.commands) && data.commands.length > 0
+    ? data.commands
+    : FALLBACK_COMMANDS) as CommandEntry[];
+
+  const filteredCommands = useMemo(() => {
+    const normalized = query.trim().toLowerCase();
+    if (!normalized) {
+      return commands;
+    }
+
+    return commands.filter((command) => {
+      const haystack = `${command.name} ${command.description || ''} ${command.namespace || ''}`.toLowerCase();
+      return haystack.includes(normalized);
+    });
+  }, [commands, query]);
+
+  return (
+    <div className="grid h-full min-h-0 gap-4 lg:grid-cols-[minmax(0,1fr)_18rem]">
+      <div className="flex min-h-0 flex-col gap-3">
+        <SearchField value={query} onChange={setQuery} placeholder="Filter commands..." />
+
+        <div className="scrollbar-thin min-h-0 flex-1 overflow-y-auto pr-1">
+          <div className="grid gap-2 sm:grid-cols-2">
+            {filteredCommands.map((command, index) => (
+              <div
+                key={`${command.namespace || 'builtin'}-${command.name}`}
+                className="settings-content-enter rounded-2xl border border-border/70 bg-background/75 p-3 shadow-sm transition-all duration-200 hover:-translate-y-0.5 hover:border-primary/30 hover:bg-muted/25"
+                style={{ animationDelay: `${Math.min(index * 18, 160)}ms` }}
+              >
+                <div className="flex items-start justify-between gap-3">
+                  <code className="rounded-lg border border-primary/20 bg-primary/10 px-2 py-1 text-xs font-semibold text-primary">
+                    {command.name}
+                  </code>
+                  <Badge variant="secondary" className="shrink-0 text-[10px] capitalize">
+                    {command.namespace || 'builtin'}
+                  </Badge>
+                </div>
+                <p className="mt-3 text-sm leading-5 text-muted-foreground">
+                  {command.description || 'No description available.'}
+                </p>
+              </div>
+            ))}
+          </div>
+
+          {filteredCommands.length === 0 && (
+            <div className="rounded-2xl border border-dashed border-border bg-muted/20 px-4 py-10 text-center text-sm text-muted-foreground">
+              No commands match that filter.
+            </div>
+          )}
+        </div>
+      </div>
+
+      <aside className="space-y-3">
+        <div className="rounded-2xl border border-border/70 bg-muted/20 p-4">
+          <div className="mb-3 flex items-center gap-2 text-sm font-semibold text-foreground">
+            <TerminalSquare className="h-4 w-4 text-primary" />
+            Syntax
+          </div>
+          <div className="space-y-2 text-sm text-muted-foreground">
+            <p><code className="text-foreground">/command arg1 arg2</code></p>
+            <p><code className="text-foreground">$ARGUMENTS</code> passes all args.</p>
+            <p><code className="text-foreground">$1</code>, <code className="text-foreground">$2</code> pass positional args.</p>
+            <p><code className="text-foreground">@file</code> includes file contents.</p>
+          </div>
+        </div>
+
+        <div className="rounded-2xl border border-primary/25 bg-primary/10 p-4">
+          <div className="mb-2 flex items-center gap-2 text-sm font-semibold text-foreground">
+            <Sparkles className="h-4 w-4 text-primary" />
+            Quick tip
+          </div>
+          <p className="text-sm leading-5 text-muted-foreground">
+            Type <code className="text-foreground">/</code> in the composer to open the command palette, then use arrows and Enter to run a command.
+          </p>
+        </div>
+      </aside>
+    </div>
+  );
+}
+
+function ModelsContent({
+  data,
+  providerModelCatalog,
+  providerModelCacheCatalog,
+  providerModelsRefreshing,
+  onHardRefreshProviderModels,
+  currentSessionId,
+  onSelectProviderModel,
+}: {
+  data: ModelCommandData;
+  providerModelCatalog: Partial<Record<LLMProvider, ProviderModelsDefinition>>;
+  providerModelCacheCatalog: Partial<Record<LLMProvider, ProviderModelsCacheInfo>>;
+  providerModelsRefreshing: boolean;
+  onHardRefreshProviderModels: () => void;
+  currentSessionId: string | null;
+  onSelectProviderModel: CommandResultModalProps['onSelectProviderModel'];
+}) {
+  const [query, setQuery] = useState('');
+  const [copiedModel, setCopiedModel] = useState<string | null>(null);
+  const [changingModel, setChangingModel] = useState<string | null>(null);
+  const [pendingSessionModel, setPendingSessionModel] = useState<string | null>(null);
+  const [selectionNotice, setSelectionNotice] = useState<string | null>(null);
+  const currentProvider = (data?.current?.provider || 'claude') as LLMProvider;
+  const currentModel = data?.current?.model || 'Unknown';
+  const providerLabel = data?.current?.providerLabel || getProviderLabel(currentProvider);
+  const liveDefinition = providerModelCatalog[currentProvider];
+  const currentCache = providerModelCacheCatalog[currentProvider] ?? data?.cache;
+  const availableOptions = useMemo<ModelOption[]>(() => {
+    if (liveDefinition?.OPTIONS && liveDefinition.OPTIONS.length > 0) {
+      return liveDefinition.OPTIONS;
+    }
+
+    if (Array.isArray(data?.availableOptions) && data.availableOptions.length > 0) {
+      return data.availableOptions;
+    }
+
+    const availableModels = Array.isArray(data?.availableModels) ? data.availableModels : [];
+    return availableModels.map((model) => ({ value: model, label: model }));
+  }, [data, liveDefinition]);
+  const defaultModel = liveDefinition?.DEFAULT || data?.defaultModel || currentModel;
+
+  const filteredOptions = useMemo(() => {
+    const normalized = query.trim().toLowerCase();
+    if (!normalized) {
+      return availableOptions;
+    }
+
+    return availableOptions.filter((option) => {
+      const haystack = `${option.value} ${option.label || ''} ${option.description || ''}`.toLowerCase();
+      return haystack.includes(normalized);
+    });
+  }, [availableOptions, query]);
+
+  const activeOption = availableOptions.find((option) => option.value === currentModel);
+  const hasConcreteSessionId = typeof currentSessionId === 'string' && currentSessionId.trim().length > 0;
+
+  const copyModel = (model: string) => {
+    if (typeof navigator !== 'undefined' && navigator.clipboard) {
+      void navigator.clipboard.writeText(model).catch(() => undefined);
+    }
+    setCopiedModel(model);
+    window.setTimeout(() => {
+      setCopiedModel((current) => (current === model ? null : current));
+    }, 1300);
+  };
+
+  const handleSelectModel = async (model: string) => {
+    setChangingModel(model);
+    try {
+      const result = await onSelectProviderModel(currentProvider, model, currentSessionId);
+      if (result.scope === 'session') {
+        setPendingSessionModel(result.model);
+        setSelectionNotice(`Next response will resume with ${result.model}.`);
+        return;
+      }
+
+      setPendingSessionModel(null);
+      setSelectionNotice(`Default ${providerLabel} model set to ${result.model}.`);
+    } catch (error) {
+      const message = error instanceof Error ? error.message : 'Unable to change the model right now.';
+      setSelectionNotice(message);
+    } finally {
+      setChangingModel(null);
+    }
+  };
+
+  return (
+    <div className="flex h-full min-h-0 flex-col gap-2.5">
+      <div className="rounded-2xl border border-border/70 bg-muted/20 p-2.5">
+        <div className="grid gap-2.5 lg:grid-cols-[minmax(0,1.55fr)_minmax(12rem,0.7fr)_minmax(15rem,0.9fr)] lg:items-start">
+          <div className="min-w-0">
+            <div className="flex flex-wrap items-center gap-2">
+              <Badge variant="secondary" className="rounded-lg border border-primary/20 bg-primary/10 px-2.5 py-1 text-[10px] font-semibold uppercase tracking-[0.18em] text-primary">
+                {providerLabel}
+              </Badge>
+              <Badge variant="secondary" className="rounded-lg px-2.5 py-1 text-[10px] font-semibold uppercase tracking-[0.18em] text-foreground">
+                {availableOptions.length} models
+              </Badge>
+            </div>
+
+            <div className="mt-2 rounded-xl border border-primary/15 bg-primary/[0.06] px-3 py-2">
+              <p className="text-[11px] font-bold uppercase tracking-[0.2em] text-primary">Active Model</p>
+              <p className="mt-1 break-all font-mono text-[0.98rem] font-semibold leading-5 text-foreground sm:text-[1.05rem]">
+                {currentModel}
+              </p>
+              {activeOption?.label && activeOption.label !== currentModel && (
+                <p className="mt-1 text-[11px] font-medium text-foreground/85">{activeOption.label}</p>
+              )}
+              {activeOption?.description && (
+                <p className="mt-0.5 line-clamp-1 text-[11px] text-muted-foreground">{activeOption.description}</p>
+              )}
+              {pendingSessionModel && pendingSessionModel !== currentModel && (
+                <p className="mt-1 text-[10px] font-semibold uppercase tracking-[0.16em] text-primary">
+                  Next response: {pendingSessionModel}
+                </p>
+              )}
+            </div>
+          </div>
+
+          <div className="grid gap-2 sm:grid-cols-2 lg:grid-cols-1">
+            <div className="rounded-xl border border-border/60 bg-background/55 px-2.5 py-1.5">
+              <p className="text-[10px] font-bold uppercase tracking-[0.18em] text-foreground/80">Default</p>
+              <p className="mt-1 break-all font-mono text-[11px] font-medium text-foreground">{defaultModel}</p>
+            </div>
+            <div className="rounded-xl border border-border/60 bg-background/55 px-2.5 py-1.5">
+              <p className="text-[10px] font-bold uppercase tracking-[0.18em] text-foreground/80">Updated</p>
+              <p className="mt-1 text-[11px] font-medium text-foreground">{formatUpdatedAt(currentCache?.updatedAt)}</p>
+            </div>
+          </div>
+
+          <div className="rounded-xl border border-border/60 bg-background/55 p-2.5">
+            <div className="flex flex-wrap items-center gap-1.5">
+              <p className="text-[10px] font-bold uppercase tracking-[0.18em] text-foreground/80">
+                Catalog Refresh
+              </p>
+              <Badge variant="secondary" className="rounded-md px-1.5 py-0 text-[9px] uppercase tracking-[0.14em]">
+                All providers
+              </Badge>
+            </div>
+            <p className="mt-1.5 text-[11px] leading-4 text-muted-foreground">
+              Model lists are cached for 3 days. Refresh after CLI, auth, or config changes,
+              or when a new model is missing.
+            </p>
+            <Button
+              type="button"
+              variant="outline"
+              size="sm"
+              onClick={onHardRefreshProviderModels}
+              disabled={providerModelsRefreshing}
+              className="mt-2 h-8 w-full rounded-xl px-3"
+            >
+              <RefreshCw className={providerModelsRefreshing ? 'animate-spin' : ''} />
+              {providerModelsRefreshing ? 'Refreshing catalogs...' : 'Refresh from providers'}
+            </Button>
+          </div>
+        </div>
+
+        <div className="mt-2 border-t border-border/50 pt-1.5 text-[11px] text-muted-foreground">
+          {hasConcreteSessionId
+            ? 'Selecting a model stores a session override and applies it on the next response for this session.'
+            : 'Selecting a model updates the default model used for new turns in this provider.'}
+          {selectionNotice && <span className="ml-2 text-foreground">{selectionNotice}</span>}
+        </div>
+      </div>
+
+      <div className="flex min-h-0 flex-1 flex-col rounded-3xl border border-border/70 bg-muted/15 p-3 sm:p-4">
+        <div className="mb-2.5 grid gap-2 sm:grid-cols-[1fr_auto] sm:items-center">
+          <div className="min-w-0">
+            <SearchField value={query} onChange={setQuery} placeholder={`Search ${providerLabel} models...`} />
+          </div>
+          <Badge variant="secondary" className="h-9 justify-center rounded-xl px-3 font-mono text-xs">
+            {filteredOptions.length} shown
+          </Badge>
+        </div>
+
+        {filteredOptions.length > 0 ? (
+          <div className="scrollbar-thin min-h-0 flex-1 overflow-y-auto pr-1">
+            <div className="grid gap-2 md:grid-cols-2">
+              {filteredOptions.map((option, index) => {
+                const isCurrent = option.value === currentModel;
+                const wasCopied = copiedModel === option.value;
+                const isPendingSelection = option.value === pendingSessionModel;
+                const isChanging = option.value === changingModel;
+                return (
+                  <div
+                    key={option.value}
+                    className={`settings-content-enter group flex min-h-[4.5rem] items-start gap-3 rounded-2xl border p-3 shadow-sm transition-all duration-200 hover:-translate-y-0.5 hover:shadow-md ${
+                      isCurrent
+                        ? 'border-primary/45 bg-primary/10'
+                        : isPendingSelection
+                          ? 'border-emerald-500/35 bg-emerald-500/10'
+                          : 'border-border/70 bg-background/80 hover:border-primary/30 hover:bg-background'
+                    }`}
+                    style={{ animationDelay: `${Math.min(index * 14, 180)}ms` }}
+                  >
+                    <button
+                      type="button"
+                      onClick={() => handleSelectModel(option.value)}
+                      disabled={Boolean(changingModel)}
+                      className="min-w-0 flex-1 text-left focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring"
+                      aria-label={`Use model ${option.value}`}
+                    >
+                      <span className="flex items-center gap-2">
+                        <span className="break-all font-mono text-sm font-semibold text-foreground">{option.value}</span>
+                        {isCurrent && <BadgeCheck className="h-4 w-4 shrink-0 text-primary" />}
+                      </span>
+                      {option.label && option.label !== option.value && (
+                        <span className="mt-1 block text-xs text-muted-foreground">{option.label}</span>
+                      )}
+                      {option.description && (
+                        <span className="mt-1 block text-xs leading-5 text-muted-foreground">{option.description}</span>
+                      )}
+                      {isCurrent && <span className="mt-2 block text-[11px] font-semibold uppercase tracking-[0.16em] text-primary">Current selection</span>}
+                      {isPendingSelection && !isCurrent && (
+                        <span className="mt-2 block text-[11px] font-semibold uppercase tracking-[0.16em] text-emerald-400">
+                          Next response selection
+                        </span>
+                      )}
+                      {isChanging && (
+                        <span className="mt-2 block text-[11px] font-semibold uppercase tracking-[0.16em] text-primary">
+                          Applying...
+                        </span>
+                      )}
+                    </button>
+                    <button
+                      type="button"
+                      onClick={() => copyModel(option.value)}
+                      className="rounded-lg border border-border/70 bg-muted/30 p-2 text-muted-foreground transition-colors group-hover:text-primary"
+                      aria-label={`Copy model id ${option.value}`}
+                    >
+                      {wasCopied ? <Check className="h-4 w-4" /> : <Clipboard className="h-4 w-4" />}
+                    </button>
+                  </div>
+                );
+              })}
+            </div>
+          </div>
+        ) : (
+          <div className="rounded-2xl border border-dashed border-border bg-background/60 px-4 py-10 text-center text-sm text-muted-foreground">
+            No models match that search.
+          </div>
+        )}
+      </div>
+    </div>
+  );
+}
+
+function CostContent({ data }: { data: CostCommandData }) {
+  const used = Number(data.tokenUsage?.used ?? 0);
+  const total = Number(data.tokenUsage?.total ?? 0);
+  const percentage = clampPercentage(Number(data.tokenUsage?.percentage ?? 0));
+  const model = data.model || 'Unknown';
+  const provider = getProviderLabel(data.provider, data.provider || 'Unknown');
+  const inputTokens = Number(data.tokenBreakdown?.input ?? 0);
+  const outputTokens = Number(data.tokenBreakdown?.output ?? 0);
+  const cacheTokens = Number(data.tokenBreakdown?.cache ?? 0);
+  const totalCost = Number(data.cost?.total ?? 0);
+
+  return (
+    <div className="grid gap-4 lg:grid-cols-[18rem_1fr]">
+      <div className="rounded-3xl border border-primary/25 bg-primary/10 p-5 text-center">
+        <div
+          className="mx-auto grid h-40 w-40 place-items-center rounded-full p-2 shadow-inner"
+          style={{
+            background: `conic-gradient(hsl(var(--primary)) ${percentage * 3.6}deg, hsl(var(--muted)) 0deg)`,
+          }}
+        >
+          <div className="grid h-full w-full place-items-center rounded-full border border-border/70 bg-popover">
+            <div>
+              <p className="font-mono text-3xl font-semibold text-foreground">{percentage.toFixed(1)}%</p>
+              <p className="mt-1 text-xs uppercase tracking-[0.18em] text-muted-foreground">context</p>
+            </div>
+          </div>
+        </div>
+        <p className="mt-4 text-sm text-muted-foreground">
+          {formatNumber(used)} of {formatNumber(total)} tokens used
+        </p>
+      </div>
+
+      <div className="space-y-3">
+        <div className="grid gap-3 sm:grid-cols-3">
+          <MetricCard label="Input" value={formatCurrency(data.cost?.input)} icon={Zap} />
+          <MetricCard label="Output" value={formatCurrency(data.cost?.output)} icon={Activity} />
+          <MetricCard label="Total" value={formatCurrency(totalCost)} icon={Coins} tone="primary" />
+        </div>
+
+        <div className="grid gap-3 sm:grid-cols-3">
+          <MetricCard label="Input tokens" value={formatNumber(inputTokens)} icon={CommandIcon} />
+          <MetricCard label="Output tokens" value={formatNumber(outputTokens)} icon={TerminalSquare} />
+          <MetricCard label="Cache tokens" value={formatNumber(cacheTokens)} icon={Package} />
+        </div>
+
+        <div className="rounded-2xl border border-border/70 bg-muted/20 p-4">
+          <div className="grid gap-3 sm:grid-cols-2">
+            <div>
+              <p className="text-[11px] font-semibold uppercase tracking-[0.18em] text-muted-foreground">Provider</p>
+              <p className="mt-1 text-sm font-semibold text-foreground">{provider}</p>
+            </div>
+            <div>
+              <p className="text-[11px] font-semibold uppercase tracking-[0.18em] text-muted-foreground">Model</p>
+              <p className="mt-1 break-all font-mono text-sm text-foreground">{model}</p>
+            </div>
+          </div>
+          <p className="mt-3 text-xs leading-5 text-muted-foreground">
+            Cost is an estimate based on the available token counters and default provider rates.
+          </p>
+        </div>
+      </div>
+    </div>
+  );
+}
+
+function StatusContent({ data }: { data: StatusCommandData }) {
+  const memoryRssMb = data.memoryUsage?.rssMb;
+  const rows = [
+    { label: 'Package', value: data.packageName || 'claude-code-ui', icon: Package },
+    { label: 'Version', value: data.version || 'Unknown', icon: BadgeCheck, tone: 'success' as const },
+    { label: 'Uptime', value: data.uptime || 'Unknown', icon: Timer },
+    { label: 'Provider', value: getProviderLabel(data.provider, data.provider || 'Unknown'), icon: Server, tone: 'primary' as const },
+    { label: 'Model', value: data.model || 'Unknown', icon: Cpu },
+    { label: 'Node.js', value: data.nodeVersion || 'Unknown', icon: TerminalSquare },
+    { label: 'Platform', value: data.platform || 'Unknown', icon: Activity },
+    { label: 'Memory', value: typeof memoryRssMb === 'number' ? `${memoryRssMb} MB RSS` : 'Unknown', icon: Gauge },
+  ];
+
+  return (
+    <div className="space-y-4">
+      <div className="flex items-center justify-between rounded-3xl border border-emerald-500/25 bg-emerald-500/10 p-4">
+        <div className="flex items-center gap-3">
+          <span className="relative flex h-3 w-3">
+            <span className="absolute inline-flex h-full w-full animate-ping rounded-full bg-emerald-400 opacity-75" />
+            <span className="relative inline-flex h-3 w-3 rounded-full bg-emerald-500" />
+          </span>
+          <div>
+            <p className="text-sm font-semibold text-foreground">Runtime online</p>
+            <p className="text-xs text-muted-foreground">Process {data.pid ? `#${data.pid}` : 'status'} is responding.</p>
+          </div>
+        </div>
+        <Badge className="rounded-full bg-emerald-500 text-white hover:bg-emerald-500">Healthy</Badge>
+      </div>
+
+      <div className="grid gap-3 sm:grid-cols-2 lg:grid-cols-4">
+        {rows.map((row) => (
+          <MetricCard key={row.label} label={row.label} value={String(row.value)} icon={row.icon} tone={row.tone} />
+        ))}
+      </div>
+    </div>
+  );
+}
+
+export default function CommandResultModal({
+  payload,
+  onClose,
+  providerModelCatalog,
+  providerModelCacheCatalog,
+  providerModelsRefreshing,
+  onHardRefreshProviderModels,
+  currentSessionId,
+  onSelectProviderModel,
+}: CommandResultModalProps) {
+  const isOpen = Boolean(payload);
+  const kind = payload?.kind;
+  const isModelsModal = kind === 'models';
+
+  const modalMeta = {
+    help: {
+      eyebrow: 'Command center',
+      title: 'Help & Shortcuts',
+      subtitle: 'Search built-ins, syntax patterns, and command usage without leaving the chat.',
+      icon: CircleHelp,
+    },
+    models: {
+      eyebrow: 'Model inventory',
+      title: 'Available Models',
+      subtitle: 'Browse, search, and copy model IDs for the active provider.',
+      icon: Cpu,
+    },
+    cost: {
+      eyebrow: 'Session telemetry',
+      title: 'Usage & Cost',
+      subtitle: 'Token budget, context pressure, and estimated spend for this session.',
+      icon: Coins,
+    },
+    status: {
+      eyebrow: 'Runtime health',
+      title: 'System Status',
+      subtitle: 'Version, provider, runtime, and environment details in one place.',
+      icon: Activity,
+    },
+  } as const;
+
+  const activeMeta = kind ? modalMeta[kind] : null;
+  const HeaderIcon = activeMeta?.icon || Sparkles;
+
+  return (
+    <Dialog open={isOpen} onOpenChange={(open) => !open && onClose()}>
+      <DialogContent className="flex h-[min(92dvh,48rem)] w-[calc(100vw-1rem)] max-w-5xl flex-col overflow-hidden rounded-3xl border-border/80 bg-popover/95 p-0 shadow-2xl backdrop-blur-xl sm:w-[min(94vw,64rem)]">
+        <DialogTitle>{activeMeta?.title || 'Command Result'}</DialogTitle>
+
+        <div
+          className={`relative shrink-0 overflow-hidden border-b border-border/70 bg-gradient-to-br from-primary/15 via-background to-muted/40 ${
+            isModelsModal ? 'px-4 pb-3 pt-3 sm:px-5 sm:pb-4 sm:pt-4' : 'px-4 pb-4 pt-4 sm:px-6 sm:pb-5 sm:pt-5'
+          }`}
+        >
+          <div className="pointer-events-none absolute -left-20 -top-24 h-56 w-56 rounded-full bg-primary/20 blur-3xl" />
+          <div className="pointer-events-none absolute right-0 top-0 h-full w-1/2 bg-[radial-gradient(circle_at_top_right,hsl(var(--primary)/0.16),transparent_58%)]" />
+
+          <div className="relative flex items-start justify-between gap-3">
+            <div className="flex min-w-0 items-start gap-3 sm:items-center">
+              <div
+                className={`rounded-2xl border border-primary/30 bg-primary/10 text-primary shadow-sm ${
+                  isModelsModal ? 'p-2.5' : 'p-3'
+                }`}
+              >
+                <HeaderIcon className={isModelsModal ? 'h-4 w-4' : 'h-5 w-5'} />
+              </div>
+              <div className="min-w-0">
+                <p className="text-[12px] font-bold uppercase tracking-[0.22em] text-primary">
+                  {activeMeta?.eyebrow}
+                </p>
+                <p className={`mt-1 font-semibold tracking-tight text-foreground ${isModelsModal ? 'text-xl sm:text-2xl' : 'text-xl sm:text-2xl'}`}>
+                  {activeMeta?.title}
+                </p>
+                <p className={`mt-1 max-w-2xl ${isModelsModal ? 'text-sm leading-5 text-foreground/75' : 'text-sm leading-5 text-muted-foreground'}`}>
+                  {activeMeta?.subtitle}
+                </p>
+              </div>
+            </div>
+
+            <Button
+              type="button"
+              variant="ghost"
+              size="icon"
+              onClick={onClose}
+              className="h-9 w-9 shrink-0 rounded-xl text-muted-foreground hover:bg-background/70 hover:text-foreground"
+              aria-label="Close command result modal"
+            >
+              <X className="h-4 w-4" />
+            </Button>
+          </div>
+        </div>
+
+        <div className="settings-content-enter min-h-0 flex-1 overflow-hidden px-4 py-4 sm:px-6 sm:py-5">
+          {payload?.kind === 'help' && <HelpContent data={payload.data as HelpCommandData} />}
+          {payload?.kind === 'models' && (
+            <ModelsContent
+              data={payload.data as ModelCommandData}
+              providerModelCatalog={providerModelCatalog}
+              providerModelCacheCatalog={providerModelCacheCatalog}
+              providerModelsRefreshing={providerModelsRefreshing}
+              onHardRefreshProviderModels={onHardRefreshProviderModels}
+              currentSessionId={currentSessionId}
+              onSelectProviderModel={onSelectProviderModel}
+            />
+          )}
+          {payload?.kind === 'cost' && <CostContent data={payload.data as CostCommandData} />}
+          {payload?.kind === 'status' && <StatusContent data={payload.data as StatusCommandData} />}
+        </div>
+
+        <div className="flex shrink-0 flex-col gap-3 border-t border-border/70 bg-muted/20 px-4 py-3 text-xs text-muted-foreground sm:flex-row sm:items-center sm:justify-between sm:px-6">
+          <div className="flex items-center gap-2">
+            <Gauge className="h-3.5 w-3.5" />
+            <span>Esc closes the modal.</span>
+          </div>
+          <Button type="button" variant="outline" size="sm" onClick={onClose} className="rounded-xl">
+            Close
+          </Button>
+        </div>
+      </DialogContent>
+    </Dialog>
+  );
+}
diff --git a/src/components/chat/view/subcomponents/MessageComponent.tsx b/src/components/chat/view/subcomponents/MessageComponent.tsx
index 1b678a57..fa013783 100644
--- a/src/components/chat/view/subcomponents/MessageComponent.tsx
+++ b/src/components/chat/view/subcomponents/MessageComponent.tsx
@@ -176,7 +176,19 @@ const MessageComponent = memo(({ message, prevMessage, createDiff, onFileOpen, o
                 </div>
               )}
               <div className="text-sm font-medium text-gray-900 dark:text-white">
-                {message.type === 'error' ? t('messageTypes.error') : message.type === 'tool' ? t('messageTypes.tool') : (provider === 'cursor' ? t('messageTypes.cursor') : provider === 'codex' ? t('messageTypes.codex') : provider === 'gemini' ? t('messageTypes.gemini') : t('messageTypes.claude'))}
+                {message.type === 'error'
+                  ? t('messageTypes.error')
+                  : message.type === 'tool'
+                    ? t('messageTypes.tool')
+                    : (provider === 'cursor'
+                        ? t('messageTypes.cursor')
+                        : provider === 'codex'
+                          ? t('messageTypes.codex')
+                          : provider === 'gemini'
+                            ? t('messageTypes.gemini')
+                            : provider === 'opencode'
+                              ? t('messageTypes.opencode', { defaultValue: 'OpenCode' })
+                              : t('messageTypes.claude'))}
               </div>
             </div>
           )}
diff --git a/src/components/chat/view/subcomponents/ProviderSelectionEmptyState.tsx b/src/components/chat/view/subcomponents/ProviderSelectionEmptyState.tsx
index 3f82438f..ef9a103e 100644
--- a/src/components/chat/view/subcomponents/ProviderSelectionEmptyState.tsx
+++ b/src/components/chat/view/subcomponents/ProviderSelectionEmptyState.tsx
@@ -3,15 +3,12 @@ import { Check, ChevronDown } from "lucide-react";
 import { Trans, useTranslation } from "react-i18next";
 
 import { useServerPlatform } from "../../../../hooks/useServerPlatform";
+import type {
+  ProjectSession,
+  LLMProvider,
+  ProviderModelsDefinition,
+} from "../../../../types/app";
 import SessionProviderLogo from "../../../llm-logo-provider/SessionProviderLogo";
-import {
-  CLAUDE_MODELS,
-  CURSOR_MODELS,
-  CODEX_MODELS,
-  GEMINI_MODELS,
-  PROVIDERS,
-} from "../../../../../shared/modelConstants";
-import type { ProjectSession, LLMProvider } from "../../../../types/app";
 import { NextTaskBanner } from "../../../task-master";
 import {
   Dialog,
@@ -27,6 +24,14 @@ import {
   Card,
 } from "../../../../shared/view/ui";
 
+const PROVIDER_META: { id: LLMProvider; name: string }[] = [
+  { id: "claude", name: "Anthropic" },
+  { id: "codex", name: "OpenAI" },
+  { id: "gemini", name: "Google" },
+  { id: "cursor", name: "Cursor" },
+  { id: "opencode", name: "OpenCode" },
+];
+
 const MOD_KEY =
   typeof navigator !== "undefined" && /Mac|iPhone|iPad/.test(navigator.platform) ? "⌘" : "Ctrl";
 
@@ -44,6 +49,10 @@ type ProviderSelectionEmptyStateProps = {
   setCodexModel: (model: string) => void;
   geminiModel: string;
   setGeminiModel: (model: string) => void;
+  opencodeModel: string;
+  setOpenCodeModel: (model: string) => void;
+  providerModelCatalog: Partial<Record<LLMProvider, ProviderModelsDefinition>>;
+  providerModelsLoading: boolean;
   tasksEnabled: boolean;
   isTaskMasterInstalled: boolean | null;
   onShowAllTasks?: (() => void) | null;
@@ -53,20 +62,15 @@ type ProviderSelectionEmptyStateProps = {
 type ProviderGroup = {
   id: LLMProvider;
   name: string;
-  models: { value: string; label: string }[];
+  models: { value: string; label: string; description?: string }[];
 };
 
-const PROVIDER_GROUPS: ProviderGroup[] = PROVIDERS.map((p) => ({
-  id: p.id as LLMProvider,
-  name: p.name,
-  models: p.models.OPTIONS,
-}));
-
-function getModelConfig(p: LLMProvider) {
-  if (p === "claude") return CLAUDE_MODELS;
-  if (p === "codex") return CODEX_MODELS;
-  if (p === "gemini") return GEMINI_MODELS;
-  return CURSOR_MODELS;
+function getModelConfig(
+  p: LLMProvider,
+  catalog: Partial<Record<LLMProvider, ProviderModelsDefinition>>,
+): ProviderModelsDefinition {
+  const entry = catalog[p];
+  return entry ?? { OPTIONS: [], DEFAULT: "" };
 }
 
 function getCurrentModel(
@@ -75,10 +79,12 @@ function getCurrentModel(
   cu: string,
   co: string,
   g: string,
+  o: string,
 ) {
   if (p === "claude") return c;
   if (p === "codex") return co;
   if (p === "gemini") return g;
+  if (p === "opencode") return o;
   return cu;
 }
 
@@ -86,6 +92,7 @@ function getProviderDisplayName(p: LLMProvider) {
   if (p === "claude") return "Claude";
   if (p === "cursor") return "Cursor";
   if (p === "codex") return "Codex";
+  if (p === "opencode") return "OpenCode";
   return "Gemini";
 }
 
@@ -103,6 +110,10 @@ export default function ProviderSelectionEmptyState({
   setCodexModel,
   geminiModel,
   setGeminiModel,
+  opencodeModel,
+  setOpenCodeModel,
+  providerModelCatalog,
+  providerModelsLoading,
   tasksEnabled,
   isTaskMasterInstalled,
   onShowAllTasks,
@@ -112,10 +123,14 @@ export default function ProviderSelectionEmptyState({
   const { isWindowsServer } = useServerPlatform();
   const [dialogOpen, setDialogOpen] = useState(false);
 
-  const visibleProviderGroups = useMemo(
-    () => (isWindowsServer ? PROVIDER_GROUPS.filter((p) => p.id !== "cursor") : PROVIDER_GROUPS),
-    [isWindowsServer],
-  );
+  const visibleProviderGroups = useMemo(() => {
+    const groups: ProviderGroup[] = PROVIDER_META.map((p) => ({
+      id: p.id,
+      name: p.name,
+      models: providerModelCatalog[p.id]?.OPTIONS ?? [],
+    }));
+    return isWindowsServer ? groups.filter((p) => p.id !== "cursor") : groups;
+  }, [isWindowsServer, providerModelCatalog]);
 
   useEffect(() => {
     if (isWindowsServer && provider === "cursor") {
@@ -134,15 +149,16 @@ export default function ProviderSelectionEmptyState({
     cursorModel,
     codexModel,
     geminiModel,
+    opencodeModel,
   );
 
   const currentModelLabel = useMemo(() => {
-    const config = getModelConfig(provider);
+    const config = getModelConfig(provider, providerModelCatalog);
     const found = config.OPTIONS.find(
       (o: { value: string; label: string }) => o.value === currentModel,
     );
     return found?.label || currentModel;
-  }, [provider, currentModel]);
+  }, [provider, currentModel, providerModelCatalog]);
 
   const setModelForProvider = useCallback(
     (providerId: LLMProvider, modelValue: string) => {
@@ -155,12 +171,15 @@ export default function ProviderSelectionEmptyState({
       } else if (providerId === "gemini") {
         setGeminiModel(modelValue);
         localStorage.setItem("gemini-model", modelValue);
+      } else if (providerId === "opencode") {
+        setOpenCodeModel(modelValue);
+        localStorage.setItem("opencode-model", modelValue);
       } else {
         setCursorModel(modelValue);
         localStorage.setItem("cursor-model", modelValue);
       }
     },
-    [setClaudeModel, setCursorModel, setCodexModel, setGeminiModel],
+    [setClaudeModel, setCursorModel, setCodexModel, setGeminiModel, setOpenCodeModel],
   );
 
   const handleModelSelect = useCallback(
@@ -222,6 +241,9 @@ export default function ProviderSelectionEmptyState({
 
             <DialogContent className="max-w-md overflow-hidden p-0">
               <DialogTitle>Model Selector</DialogTitle>
+              <div className="border-b border-border/60 bg-muted/20 px-4 py-3">
+                <p className="text-sm font-semibold text-foreground">Choose a model</p>
+              </div>
               <Command>
                 <CommandInput
                   placeholder={t("providerSelection.searchModels", {
@@ -249,16 +271,28 @@ export default function ProviderSelectionEmptyState({
                         </span>
                       }
                     >
+                      {group.models.length === 0 && providerModelsLoading ? (
+                        <CommandItem disabled className="ml-4 border-l border-border/40 pl-4 text-muted-foreground">
+                          {t("providerSelection.loadingModels", { defaultValue: "Loading models…" })}
+                        </CommandItem>
+                      ) : null}
                       {group.models.map((model) => {
                         const isSelected = provider === group.id && currentModel === model.value;
                         return (
                           <CommandItem
                             key={`${group.id}-${model.value}`}
-                            value={`${group.name} ${model.label}`}
+                            value={`${group.name} ${model.label} ${model.description || ''}`}
                             onSelect={() => handleModelSelect(group.id, model.value)}
                             className="ml-4 border-l border-border/40 pl-4"
                           >
-                            <span className="flex-1 truncate">{model.label}</span>
+                            <div className="min-w-0 flex-1">
+                              <div className="truncate">{model.label}</div>
+                              {model.description && (
+                                <div className="truncate text-xs text-muted-foreground">
+                                  {model.description}
+                                </div>
+                              )}
+                            </div>
                             {isSelected && (
                               <Check className="ml-auto h-4 w-4 shrink-0 text-primary" />
                             )}
@@ -287,6 +321,10 @@ export default function ProviderSelectionEmptyState({
                 gemini: t("providerSelection.readyPrompt.gemini", {
                   model: geminiModel,
                 }),
+                opencode: t("providerSelection.readyPrompt.opencode", {
+                  model: opencodeModel,
+                  defaultValue: "Ready with OpenCode {{model}}",
+                }),
               }[provider]
             }
           </p>
diff --git a/src/components/command-palette/sources/useSessionsSource.ts b/src/components/command-palette/sources/useSessionsSource.ts
index 9f20df58..3623c798 100644
--- a/src/components/command-palette/sources/useSessionsSource.ts
+++ b/src/components/command-palette/sources/useSessionsSource.ts
@@ -14,6 +14,7 @@ interface SessionsResponse {
   cursorSessions?: ProjectSession[];
   codexSessions?: ProjectSession[];
   geminiSessions?: ProjectSession[];
+  opencodeSessions?: ProjectSession[];
 }
 
 export function useSessionsSource(projectId: string | undefined, enabled: boolean) {
@@ -33,6 +34,7 @@ export function useSessionsSource(projectId: string | undefined, enabled: boolea
         ...(data.cursorSessions ?? []),
         ...(data.codexSessions ?? []),
         ...(data.geminiSessions ?? []),
+        ...(data.opencodeSessions ?? []),
       ];
       return all.map<SessionResult>((s) => ({
         id: s.id,
diff --git a/src/components/llm-logo-provider/OpenCodeLogo.tsx b/src/components/llm-logo-provider/OpenCodeLogo.tsx
new file mode 100644
index 00000000..8e44a289
--- /dev/null
+++ b/src/components/llm-logo-provider/OpenCodeLogo.tsx
@@ -0,0 +1,25 @@
+type OpenCodeLogoProps = {
+  className?: string;
+};
+
+const OpenCodeLogo = ({ className = 'w-5 h-5' }: OpenCodeLogoProps) => (
+  <svg
+    viewBox="0 0 24 24"
+    role="img"
+    aria-label="OpenCode"
+    className={className}
+    fill="none"
+    xmlns="http://www.w3.org/2000/svg"
+  >
+    <rect x="2.5" y="2.5" width="19" height="19" rx="4" className="fill-foreground" />
+    <path
+      d="M8.1 8.1 4.9 12l3.2 3.9M15.9 8.1l3.2 3.9-3.2 3.9M13.2 6.9l-2.4 10.2"
+      className="stroke-background"
+      strokeWidth="1.9"
+      strokeLinecap="round"
+      strokeLinejoin="round"
+    />
+  </svg>
+);
+
+export default OpenCodeLogo;
diff --git a/src/components/llm-logo-provider/SessionProviderLogo.tsx b/src/components/llm-logo-provider/SessionProviderLogo.tsx
index 53c02291..e29ecd6d 100644
--- a/src/components/llm-logo-provider/SessionProviderLogo.tsx
+++ b/src/components/llm-logo-provider/SessionProviderLogo.tsx
@@ -3,6 +3,7 @@ import ClaudeLogo from './ClaudeLogo';
 import CodexLogo from './CodexLogo';
 import CursorLogo from './CursorLogo';
 import GeminiLogo from './GeminiLogo';
+import OpenCodeLogo from './OpenCodeLogo';
 
 type SessionProviderLogoProps = {
   provider?: LLMProvider | string | null;
@@ -25,5 +26,9 @@ export default function SessionProviderLogo({
     return <GeminiLogo className={className} />;
   }
 
+  if (provider === 'opencode') {
+    return <OpenCodeLogo className={className} />;
+  }
+
   return <ClaudeLogo className={className} />;
 }
diff --git a/src/components/mcp/constants.ts b/src/components/mcp/constants.ts
index 4b1a949c..ab6396ff 100644
--- a/src/components/mcp/constants.ts
+++ b/src/components/mcp/constants.ts
@@ -5,6 +5,7 @@ export const MCP_PROVIDER_NAMES: Record<McpProvider, string> = {
   cursor: 'Cursor',
   codex: 'Codex',
   gemini: 'Gemini',
+  opencode: 'OpenCode',
 };
 
 export const MCP_SUPPORTED_SCOPES: Record<McpProvider, McpScope[]> = {
@@ -12,6 +13,7 @@ export const MCP_SUPPORTED_SCOPES: Record<McpProvider, McpScope[]> = {
   cursor: ['user', 'project'],
   codex: ['user', 'project'],
   gemini: ['user', 'project'],
+  opencode: ['user', 'project'],
 };
 
 export const MCP_SUPPORTED_TRANSPORTS: Record<McpProvider, McpTransport[]> = {
@@ -19,6 +21,7 @@ export const MCP_SUPPORTED_TRANSPORTS: Record<McpProvider, McpTransport[]> = {
   cursor: ['stdio', 'http'],
   codex: ['stdio', 'http'],
   gemini: ['stdio', 'http', 'sse'],
+  opencode: ['stdio', 'http'],
 };
 
 export const MCP_GLOBAL_SUPPORTED_SCOPES: McpScope[] = ['user', 'project'];
@@ -30,6 +33,7 @@ export const MCP_PROVIDER_BUTTON_CLASSES: Record<McpProvider, string> = {
   cursor: 'bg-purple-600 text-white hover:bg-purple-700',
   codex: 'bg-gray-800 text-white hover:bg-gray-900 dark:bg-gray-700 dark:hover:bg-gray-600',
   gemini: 'bg-blue-600 text-white hover:bg-blue-700',
+  opencode: 'bg-zinc-900 text-white hover:bg-zinc-800 dark:bg-zinc-700 dark:hover:bg-zinc-600',
 };
 
 export const MCP_SUPPORTS_WORKING_DIRECTORY: Record<McpProvider, boolean> = {
@@ -37,6 +41,7 @@ export const MCP_SUPPORTS_WORKING_DIRECTORY: Record<McpProvider, boolean> = {
   cursor: false,
   codex: true,
   gemini: true,
+  opencode: false,
 };
 
 export const DEFAULT_MCP_FORM: McpFormState = {
diff --git a/src/components/onboarding/view/subcomponents/AgentConnectionsStep.tsx b/src/components/onboarding/view/subcomponents/AgentConnectionsStep.tsx
index 3dfb25a9..5c66997a 100644
--- a/src/components/onboarding/view/subcomponents/AgentConnectionsStep.tsx
+++ b/src/components/onboarding/view/subcomponents/AgentConnectionsStep.tsx
@@ -1,5 +1,6 @@
 import type { LLMProvider } from '../../../../types/app';
 import type { ProviderAuthStatusMap } from '../../../provider-auth/types';
+
 import AgentConnectionCard from './AgentConnectionCard';
 
 type AgentConnectionsStepProps = {
@@ -36,6 +37,13 @@ const providerCards = [
     iconContainerClassName: 'bg-teal-100 dark:bg-teal-900/30',
     loginButtonClassName: 'bg-teal-600 hover:bg-teal-700',
   },
+  {
+    provider: 'opencode' as const,
+    title: 'OpenCode',
+    connectedClassName: 'bg-zinc-100 dark:bg-zinc-800/50 border-zinc-300 dark:border-zinc-600',
+    iconContainerClassName: 'bg-zinc-100 dark:bg-zinc-800',
+    loginButtonClassName: 'bg-zinc-800 hover:bg-zinc-900 dark:bg-zinc-700 dark:hover:bg-zinc-600',
+  },
 ];
 
 export default function AgentConnectionsStep({
diff --git a/src/components/provider-auth/types.ts b/src/components/provider-auth/types.ts
index d79ab1c8..afa08094 100644
--- a/src/components/provider-auth/types.ts
+++ b/src/components/provider-auth/types.ts
@@ -10,13 +10,14 @@ export type ProviderAuthStatus = {
 
 export type ProviderAuthStatusMap = Record<LLMProvider, ProviderAuthStatus>;
 
-export const CLI_PROVIDERS: LLMProvider[] = ['claude', 'cursor', 'codex', 'gemini'];
+export const CLI_PROVIDERS: LLMProvider[] = ['claude', 'cursor', 'codex', 'gemini', 'opencode'];
 
 export const PROVIDER_AUTH_STATUS_ENDPOINTS: Record<LLMProvider, string> = {
   claude: '/api/providers/claude/auth/status',
   cursor: '/api/providers/cursor/auth/status',
   codex: '/api/providers/codex/auth/status',
   gemini: '/api/providers/gemini/auth/status',
+  opencode: '/api/providers/opencode/auth/status',
 };
 
 export const createInitialProviderAuthStatusMap = (loading = true): ProviderAuthStatusMap => ({
@@ -24,4 +25,5 @@ export const createInitialProviderAuthStatusMap = (loading = true): ProviderAuth
   cursor: { authenticated: false, email: null, method: null, error: null, loading },
   codex: { authenticated: false, email: null, method: null, error: null, loading },
   gemini: { authenticated: false, email: null, method: null, error: null, loading },
+  opencode: { authenticated: false, email: null, method: null, error: null, loading },
 });
diff --git a/src/components/provider-auth/view/ProviderLoginModal.tsx b/src/components/provider-auth/view/ProviderLoginModal.tsx
index fa1d4407..9de1d227 100644
--- a/src/components/provider-auth/view/ProviderLoginModal.tsx
+++ b/src/components/provider-auth/view/ProviderLoginModal.tsx
@@ -37,6 +37,10 @@ const getProviderCommand = ({
     return IS_PLATFORM ? 'codex login --device-auth' : 'codex login';
   }
 
+  if (provider === 'opencode') {
+    return 'opencode auth login';
+  }
+
   return 'gemini status';
 };
 
@@ -44,6 +48,7 @@ const getProviderTitle = (provider: LLMProvider) => {
   if (provider === 'claude') return 'Claude CLI Login';
   if (provider === 'cursor') return 'Cursor CLI Login';
   if (provider === 'codex') return 'Codex CLI Login';
+  if (provider === 'opencode') return 'OpenCode CLI Login';
   return 'Gemini CLI Configuration';
 };
 
diff --git a/src/components/settings/constants/constants.ts b/src/components/settings/constants/constants.ts
index e41da392..7d4c353d 100644
--- a/src/components/settings/constants/constants.ts
+++ b/src/components/settings/constants/constants.ts
@@ -37,7 +37,7 @@ export const SETTINGS_MAIN_TABS: SettingsMainTabMeta[] = [
   { id: 'about', label: 'About', keywords: 'about version info', icon: Info },
 ];
 
-export const AGENT_PROVIDERS: AgentProvider[] = ['claude', 'cursor', 'codex', 'gemini'];
+export const AGENT_PROVIDERS: AgentProvider[] = ['claude', 'cursor', 'codex', 'gemini', 'opencode'];
 export const AGENT_CATEGORIES: AgentCategory[] = ['account', 'permissions', 'mcp'];
 
 export const DEFAULT_PROJECT_SORT_ORDER: ProjectSortOrder = 'name';
diff --git a/src/components/settings/view/tabs/agents-settings/AgentListItem.tsx b/src/components/settings/view/tabs/agents-settings/AgentListItem.tsx
index 47135939..b23784ee 100644
--- a/src/components/settings/view/tabs/agents-settings/AgentListItem.tsx
+++ b/src/components/settings/view/tabs/agents-settings/AgentListItem.tsx
@@ -12,7 +12,7 @@ type AgentListItemProps = {
 
 type AgentConfig = {
   name: string;
-  color: 'blue' | 'purple' | 'gray' | 'indigo';
+  color: 'blue' | 'purple' | 'gray' | 'indigo' | 'zinc';
 };
 
 const agentConfig: Record<AgentProvider, AgentConfig> = {
@@ -31,7 +31,11 @@ const agentConfig: Record<AgentProvider, AgentConfig> = {
   gemini: {
     name: 'Gemini',
     color: 'indigo',
-  }
+  },
+  opencode: {
+    name: 'OpenCode',
+    color: 'zinc',
+  },
 };
 
 const colorClasses = {
@@ -47,6 +51,9 @@ const colorClasses = {
   indigo: {
     dot: 'bg-indigo-500',
   },
+  zinc: {
+    dot: 'bg-zinc-500',
+  },
 } as const;
 
 export default function AgentListItem({
diff --git a/src/components/settings/view/tabs/agents-settings/AgentsSettingsTab.tsx b/src/components/settings/view/tabs/agents-settings/AgentsSettingsTab.tsx
index 47087676..8b305ca5 100644
--- a/src/components/settings/view/tabs/agents-settings/AgentsSettingsTab.tsx
+++ b/src/components/settings/view/tabs/agents-settings/AgentsSettingsTab.tsx
@@ -26,7 +26,7 @@ export default function AgentsSettingsTab({
   const { isWindowsServer } = useServerPlatform();
 
   const visibleAgents = useMemo<AgentProvider[]>(() => {
-    const all: AgentProvider[] = ['claude', 'cursor', 'codex', 'gemini'];
+    const all: AgentProvider[] = ['claude', 'cursor', 'codex', 'gemini', 'opencode'];
     if (isWindowsServer) {
       return all.filter((id) => id !== 'cursor');
     }
@@ -57,12 +57,17 @@ export default function AgentsSettingsTab({
       authStatus: providerAuthStatus.gemini,
       onLogin: () => onProviderLogin('gemini'),
     },
+    opencode: {
+      authStatus: providerAuthStatus.opencode,
+      onLogin: () => onProviderLogin('opencode'),
+    },
   }), [
     onProviderLogin,
     providerAuthStatus.claude,
     providerAuthStatus.codex,
     providerAuthStatus.cursor,
     providerAuthStatus.gemini,
+    providerAuthStatus.opencode,
   ]);
 
   return (
diff --git a/src/components/settings/view/tabs/agents-settings/sections/AgentSelectorSection.tsx b/src/components/settings/view/tabs/agents-settings/sections/AgentSelectorSection.tsx
index 92304c01..a6d017fa 100644
--- a/src/components/settings/view/tabs/agents-settings/sections/AgentSelectorSection.tsx
+++ b/src/components/settings/view/tabs/agents-settings/sections/AgentSelectorSection.tsx
@@ -8,6 +8,7 @@ const AGENT_NAMES: Record<AgentProvider, string> = {
   cursor: 'Cursor',
   codex: 'Codex',
   gemini: 'Gemini',
+  opencode: 'OpenCode',
 };
 
 export default function AgentSelectorSection({
@@ -23,7 +24,8 @@ export default function AgentSelectorSection({
           const dotColor =
             agent === 'claude' ? 'bg-blue-500' :
             agent === 'cursor' ? 'bg-purple-500' :
-            agent === 'gemini' ? 'bg-indigo-500' : 'bg-foreground/60';
+            agent === 'gemini' ? 'bg-indigo-500' :
+            agent === 'opencode' ? 'bg-zinc-500' : 'bg-foreground/60';
 
           return (
             <Pill
diff --git a/src/components/settings/view/tabs/agents-settings/sections/content/AccountContent.tsx b/src/components/settings/view/tabs/agents-settings/sections/content/AccountContent.tsx
index dcf4baf1..c0ed69d5 100644
--- a/src/components/settings/view/tabs/agents-settings/sections/content/AccountContent.tsx
+++ b/src/components/settings/view/tabs/agents-settings/sections/content/AccountContent.tsx
@@ -54,6 +54,15 @@ const agentConfig: Record<AgentProvider, AgentVisualConfig> = {
     subtextClass: 'text-indigo-700 dark:text-indigo-300',
     buttonClass: 'bg-indigo-600 hover:bg-indigo-700 active:bg-indigo-800',
   },
+  opencode: {
+    name: 'OpenCode',
+    description: 'OpenCode CLI assistant',
+    bgClass: 'bg-zinc-50 dark:bg-zinc-900/20',
+    borderClass: 'border-zinc-200 dark:border-zinc-700',
+    textClass: 'text-zinc-900 dark:text-zinc-100',
+    subtextClass: 'text-zinc-700 dark:text-zinc-300',
+    buttonClass: 'bg-zinc-900 hover:bg-zinc-800 active:bg-zinc-950 dark:bg-zinc-700 dark:hover:bg-zinc-600',
+  },
 };
 
 export default function AccountContent({ agent, authStatus, onLogin }: AccountContentProps) {
@@ -66,7 +75,11 @@ export default function AccountContent({ agent, authStatus, onLogin }: AccountCo
         <SessionProviderLogo provider={agent} className="h-6 w-6" />
         <div>
           <h3 className="text-lg font-medium text-foreground">{config.name}</h3>
-          <p className="text-sm text-muted-foreground">{t(`agents.account.${agent}.description`)}</p>
+          <p className="text-sm text-muted-foreground">
+            {t(`agents.account.${agent}.description`, {
+              defaultValue: config.description || `${config.name} CLI assistant`,
+            })}
+          </p>
         </div>
       </div>
 
diff --git a/src/components/sidebar/types/types.ts b/src/components/sidebar/types/types.ts
index 0f44cf29..f8c31be2 100644
--- a/src/components/sidebar/types/types.ts
+++ b/src/components/sidebar/types/types.ts
@@ -62,6 +62,7 @@ export type SessionViewModel = {
   isCursorSession: boolean;
   isCodexSession: boolean;
   isGeminiSession: boolean;
+  isOpenCodeSession: boolean;
   isActive: boolean;
   sessionName: string;
   sessionTime: string;
diff --git a/src/components/sidebar/utils/utils.ts b/src/components/sidebar/utils/utils.ts
index 048c7e21..57e28b1d 100644
--- a/src/components/sidebar/utils/utils.ts
+++ b/src/components/sidebar/utils/utils.ts
@@ -85,6 +85,7 @@ export const createSessionViewModel = (
     isCursorSession: session.__provider === 'cursor',
     isCodexSession: session.__provider === 'codex',
     isGeminiSession: session.__provider === 'gemini',
+    isOpenCodeSession: session.__provider === 'opencode',
     isActive: diffInMinutes < 10,
     sessionName: getSessionName(session, t),
     sessionTime: getSessionTime(session),
@@ -113,7 +114,12 @@ export const getAllSessions = (project: Project): SessionWithProvider[] => {
     __provider: 'gemini' as const,
   }));
 
-  return [...claudeSessions, ...cursorSessions, ...codexSessions, ...geminiSessions].sort(
+  const opencodeSessions = (project.opencodeSessions || []).map((session) => ({
+    ...session,
+    __provider: 'opencode' as const,
+  }));
+
+  return [...claudeSessions, ...cursorSessions, ...codexSessions, ...geminiSessions, ...opencodeSessions].sort(
     (a, b) => getSessionDate(b).getTime() - getSessionDate(a).getTime(),
   );
 };
diff --git a/src/hooks/useProjectsState.ts b/src/hooks/useProjectsState.ts
index a5397b6b..e6005693 100644
--- a/src/hooks/useProjectsState.ts
+++ b/src/hooks/useProjectsState.ts
@@ -61,7 +61,8 @@ const projectsHaveChanges = (
     return (
       serialize(nextProject.cursorSessions) !== serialize(prevProject.cursorSessions) ||
       serialize(nextProject.codexSessions) !== serialize(prevProject.codexSessions) ||
-      serialize(nextProject.geminiSessions) !== serialize(prevProject.geminiSessions)
+      serialize(nextProject.geminiSessions) !== serialize(prevProject.geminiSessions) ||
+      serialize(nextProject.opencodeSessions) !== serialize(prevProject.opencodeSessions)
     );
   });
 };
@@ -98,6 +99,7 @@ const getProjectSessions = (project: Project): ProjectSession[] => {
     ...(project.codexSessions ?? []),
     ...(project.cursorSessions ?? []),
     ...(project.geminiSessions ?? []),
+    ...(project.opencodeSessions ?? []),
   ];
 };
 
@@ -145,6 +147,7 @@ const mergeExpandedSessionPages = (previousProjects: Project[], incomingProjects
       cursorSessions: mergeSessionProviderLists(incomingProject.cursorSessions ?? [], previousProject.cursorSessions ?? []),
       codexSessions: mergeSessionProviderLists(incomingProject.codexSessions ?? [], previousProject.codexSessions ?? []),
       geminiSessions: mergeSessionProviderLists(incomingProject.geminiSessions ?? [], previousProject.geminiSessions ?? []),
+      opencodeSessions: mergeSessionProviderLists(incomingProject.opencodeSessions ?? [], previousProject.opencodeSessions ?? []),
     };
 
     const totalSessions = Number(incomingProject.sessionMeta?.total ?? previousLoadedCount);
@@ -160,7 +163,7 @@ const mergeExpandedSessionPages = (previousProjects: Project[], incomingProjects
 
 const mergeProjectSessionPage = (
   existingProject: Project,
-  sessionsPage: Pick<Project, 'sessions' | 'cursorSessions' | 'codexSessions' | 'geminiSessions' | 'sessionMeta'>,
+  sessionsPage: Pick<Project, 'sessions' | 'cursorSessions' | 'codexSessions' | 'geminiSessions' | 'opencodeSessions' | 'sessionMeta'>,
 ): Project => {
   const mergedProject: Project = {
     ...existingProject,
@@ -168,6 +171,7 @@ const mergeProjectSessionPage = (
     cursorSessions: mergeSessionProviderLists(existingProject.cursorSessions ?? [], sessionsPage.cursorSessions ?? []),
     codexSessions: mergeSessionProviderLists(existingProject.codexSessions ?? [], sessionsPage.codexSessions ?? []),
     geminiSessions: mergeSessionProviderLists(existingProject.geminiSessions ?? [], sessionsPage.geminiSessions ?? []),
+    opencodeSessions: mergeSessionProviderLists(existingProject.opencodeSessions ?? [], sessionsPage.opencodeSessions ?? []),
   };
 
   const totalSessions = Number(sessionsPage.sessionMeta?.total ?? existingProject.sessionMeta?.total ?? 0);
@@ -555,6 +559,21 @@ export function useProjectsState({
         }
         return;
       }
+
+      const opencodeSession = project.opencodeSessions?.find((session) => session.id === sessionId);
+      if (opencodeSession) {
+        const shouldUpdateProject = selectedProject?.projectId !== project.projectId;
+        const shouldUpdateSession =
+          selectedSession?.id !== sessionId || selectedSession.__provider !== 'opencode';
+
+        if (shouldUpdateProject) {
+          setSelectedProject(project);
+        }
+        if (shouldUpdateSession) {
+          setSelectedSession({ ...opencodeSession, __provider: 'opencode' });
+        }
+        return;
+      }
     }
 
     // Session id is in the URL but not yet present on any project payload (common
@@ -583,6 +602,8 @@ export function useProjectsState({
           ? 'codex'
           : providerFromStorage === 'gemini'
             ? 'gemini'
+            : providerFromStorage === 'opencode'
+              ? 'opencode'
             : 'claude';
 
     setSelectedSession({
@@ -665,12 +686,14 @@ export function useProjectsState({
           const cursorSessions = project.cursorSessions?.filter((session) => session.id !== sessionIdToDelete) ?? [];
           const codexSessions = project.codexSessions?.filter((session) => session.id !== sessionIdToDelete) ?? [];
           const geminiSessions = project.geminiSessions?.filter((session) => session.id !== sessionIdToDelete) ?? [];
+          const opencodeSessions = project.opencodeSessions?.filter((session) => session.id !== sessionIdToDelete) ?? [];
 
           const removedFromProject = (
             sessions.length !== (project.sessions?.length ?? 0)
             || cursorSessions.length !== (project.cursorSessions?.length ?? 0)
             || codexSessions.length !== (project.codexSessions?.length ?? 0)
             || geminiSessions.length !== (project.geminiSessions?.length ?? 0)
+            || opencodeSessions.length !== (project.opencodeSessions?.length ?? 0)
           );
 
           if (!removedFromProject) {
@@ -683,6 +706,7 @@ export function useProjectsState({
             cursorSessions,
             codexSessions,
             geminiSessions,
+            opencodeSessions,
           };
 
           const totalSessions = Math.max(0, Number(project.sessionMeta?.total ?? 0) - 1);
@@ -776,7 +800,7 @@ export function useProjectsState({
       throw new Error(message);
     }
 
-    const sessionsPage = (await response.json()) as Pick<Project, 'sessions' | 'cursorSessions' | 'codexSessions' | 'geminiSessions' | 'sessionMeta'>;
+    const sessionsPage = (await response.json()) as Pick<Project, 'sessions' | 'cursorSessions' | 'codexSessions' | 'geminiSessions' | 'opencodeSessions' | 'sessionMeta'>;
 
     let mergedProjectForSelection: Project | null = null;
     setProjects((previousProjects) =>
diff --git a/src/i18n/locales/en/chat.json b/src/i18n/locales/en/chat.json
index 6db4d751..2f5af581 100644
--- a/src/i18n/locales/en/chat.json
+++ b/src/i18n/locales/en/chat.json
@@ -18,7 +18,8 @@
     "claude": "Claude",
     "cursor": "Cursor",
     "codex": "Codex",
-    "gemini": "Gemini"
+    "gemini": "Gemini",
+    "opencode": "OpenCode"
   },
   "tools": {
     "settings": "Tool Settings",
@@ -189,6 +190,7 @@
       "cursor": "Ready to use Cursor with {{model}}. Start typing your message below.",
       "codex": "Ready to use Codex with {{model}}. Start typing your message below.",
       "gemini": "Ready to use Gemini with {{model}}. Start typing your message below.",
+      "opencode": "Ready to use OpenCode with {{model}}. Start typing your message below.",
       "default": "Select a provider above to begin"
     },
     "pressToSearch": "Press <kbd>{{shortcut}}</kbd> to search sessions, files, and commits"
diff --git a/src/i18n/locales/en/settings.json b/src/i18n/locales/en/settings.json
index 1285ac3f..2e91e027 100644
--- a/src/i18n/locales/en/settings.json
+++ b/src/i18n/locales/en/settings.json
@@ -322,6 +322,9 @@
       },
       "gemini": {
         "description": "Google Gemini AI assistant"
+      },
+      "opencode": {
+        "description": "OpenCode CLI assistant"
       }
     },
     "connectionStatus": "Connection Status",
@@ -416,7 +419,8 @@
     "description": {
       "claude": "Model Context Protocol servers provide additional tools and data sources to Claude",
       "cursor": "Model Context Protocol servers provide additional tools and data sources to Cursor",
-      "codex": "Model Context Protocol servers provide additional tools and data sources to Codex"
+      "codex": "Model Context Protocol servers provide additional tools and data sources to Codex",
+      "opencode": "Model Context Protocol servers provide additional tools and data sources to OpenCode"
     },
     "addButton": "Add MCP Server",
     "empty": "No MCP servers configured",
diff --git a/src/types/app.ts b/src/types/app.ts
index 364807f7..aed51fd4 100644
--- a/src/types/app.ts
+++ b/src/types/app.ts
@@ -1,4 +1,21 @@
-export type LLMProvider = 'claude' | 'cursor' | 'codex' | 'gemini';
+export type LLMProvider = 'claude' | 'cursor' | 'codex' | 'gemini' | 'opencode';
+
+export type ProviderModelOption = {
+  value: string;
+  label: string;
+  description?: string;
+};
+
+export type ProviderModelsDefinition = {
+  OPTIONS: ProviderModelOption[];
+  DEFAULT: string;
+};
+
+export type ProviderModelsCacheInfo = {
+  updatedAt: string;
+  expiresAt: string;
+  source: 'memory' | 'disk' | 'fresh';
+};
 
 export type AppTab = 'chat' | 'files' | 'shell' | 'git' | 'tasks' | 'preview' | `plugin:${string}`;
 
@@ -46,6 +63,7 @@ export interface Project {
   cursorSessions?: ProjectSession[];
   codexSessions?: ProjectSession[];
   geminiSessions?: ProjectSession[];
+  opencodeSessions?: ProjectSession[];
   sessionMeta?: ProjectSessionMeta;
   taskmaster?: ProjectTaskmasterInfo;
   [key: string]: unknown;