diff --git a/.github/FUNDING.yml b/.github/FUNDING.yml
new file mode 100644
index 0000000..60c2522
--- /dev/null
+++ b/.github/FUNDING.yml
@@ -0,0 +1,3 @@
+# These are supported funding model platforms
+
+github: andrepimenta
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 31a3da8..771ddf1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,18 @@ All notable changes to the "claude-code-chat" extension will be documented in th
 
 Check [Keep a Changelog](http://keepachangelog.com/) for recommendations on how to structure this file.
 
+## [2.1.0] - 2026-06-07
+
+### 🚀 Features Added
+- **Sponsor button**: Added a Sponsor button on both the GitHub repository (`.github/FUNDING.yml`) and the VS Code Marketplace listing (`sponsor` field in `package.json`), linking to GitHub Sponsors.
+- **GPT 5.5 as the default GPT model**: The "GPT" quick-select now targets OpenAI's mainline GPT 5.5, replacing the previous GPT 5.3 Codex entry, with a faster `gpt-5.4-mini` tier.
+
+### 🐛 Bug Fixes
+- **Valid fast-tier GPT fallback**: The bundled model fallback no longer points the GPT fast (haiku) tier at a non-existent `openai/gpt-5.5-mini`. It now uses `openai/gpt-5.4-mini`, matching what the live resolver selects, so the offline/fallback path can no longer hand out an invalid model id.
+
+### 🔧 Technical Improvements
+- **OpenAI model resolver retargeted**: `model-updater.ts` now resolves the OpenAI quick-model against mainline `openai/gpt-<version>` and `openai/gpt-<version>-mini` slugs instead of the `-codex` / `-codex-mini` variants, so auto-update tracks the latest general GPT release.
+
 ## [2.0.7] - 2026-04-24
 
 ### 🚀 Features Added
diff --git a/build/open-vsix/build.sh b/build/open-vsix/build.sh
index 7eabc09..31214ec 100755
--- a/build/open-vsix/build.sh
+++ b/build/open-vsix/build.sh
@@ -6,7 +6,7 @@
 set -e
 
 SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
-VERSION="2.0.9"
+VERSION="2.1.0"
 OUTPUT_NAME="vsix-claude-code-chat-${VERSION}.vsix"
 
 echo "Building Open VSIX version ${VERSION}..."
diff --git a/package.json b/package.json
index 983aca9..f3a9532 100644
--- a/package.json
+++ b/package.json
@@ -2,7 +2,7 @@
   "name": "claude-code-chat",
   "displayName": "Chat for Claude Code",
   "description": "Beautiful Claude Code Chat Interface for VS Code",
-  "version": "2.0.9",
+  "version": "2.1.0",
   "publisher": "AndrePimenta",
   "author": "Andre Pimenta",
   "repository": {
@@ -10,6 +10,9 @@
     "url": "https://github.com/andrepimenta/claude-code-chat"
   },
   "license": "SEE LICENSE IN LICENSE",
+  "sponsor": {
+    "url": "https://github.com/sponsors/andrepimenta"
+  },
   "engines": {
     "vscode": "^1.94.0"
   },
diff --git a/src/model-updater.ts b/src/model-updater.ts
index bbcddef..33d08de 100644
--- a/src/model-updater.ts
+++ b/src/model-updater.ts
@@ -63,8 +63,8 @@ const providerResolvers: Record<string, ProviderResolver> = {
 		haiku: /^zai\/GLM-([\d.]+)-(?:Air|Flash)$/i
 	},
 	'openai/gpt-': {
-		main: /^openai\/gpt-([\d.]+)-codex$/,
-		haiku: /^openai\/gpt-([\d.]+)-codex-mini$/
+		main: /^openai\/gpt-([\d.]+)$/,
+		haiku: /^openai\/gpt-([\d.]+)-mini$/
 	},
 	'gemini-': {
 		main: /^(?:google\/)?gemini-([\d.]+)-pro-preview$/,
diff --git a/src/recommended-models.json b/src/recommended-models.json
index 716280a..a5dc80e 100644
--- a/src/recommended-models.json
+++ b/src/recommended-models.json
@@ -1,14 +1,14 @@
 [
     {
-        "id": "openai/gpt-5.3-codex",
-        "name": "GPT 5.3 Codex",
-        "description": "Coding-focused GPT-5.3 variant with optimized routing.",
+        "id": "openai/gpt-5.5",
+        "name": "GPT 5.5",
+        "description": "OpenAI's GPT-5.5 with strong reasoning and agentic tool use.",
         "context_length": 400000,
         "max_output_tokens": 128000,
         "credits_per_request": 4.921875,
         "provider": "OpenAI",
         "quickLabel": "GPT",
-        "tierModels": { "sonnet": "openai/gpt-5.3-codex", "opus": "openai/gpt-5.3-codex", "haiku": "openai/gpt-5.1-codex-mini" }
+        "tierModels": { "sonnet": "openai/gpt-5.5", "opus": "openai/gpt-5.5", "haiku": "openai/gpt-5.4-mini" }
     },
     {
         "id": "google/gemini-3.1-pro-preview",