diff --git a/src/components/settings/ProvidersSettings.tsx b/src/components/settings/ProvidersSettings.tsx
index 2ab18f3..b71c736 100644
--- a/src/components/settings/ProvidersSettings.tsx
+++ b/src/components/settings/ProvidersSettings.tsx
@@ -1018,6 +1018,7 @@ function AddProviderDialog({
     : providerDocsUrl;
   const isOAuth = typeInfo?.isOAuth ?? false;
   const supportsApiKey = typeInfo?.supportsApiKey ?? false;
+  const oauthUiHidden = typeInfo?.hideOAuthUi ?? false;
   const vendorMap = new Map(vendors.map((vendor) => [vendor.id, vendor]));
   const selectedVendor = selectedType ? vendorMap.get(selectedType) : undefined;
   const showUserAgentInAddDialog = shouldShowUserAgentFieldForNewProvider(selectedType);
@@ -1027,14 +1028,18 @@ function AddProviderDialog({
       ? 'oauth_device'
       : null);
   // Effective OAuth mode: pure OAuth providers, or dual-mode with oauth selected
-  const useOAuthFlow = isOAuth && (!supportsApiKey || authMode === 'oauth');
+  const useOAuthFlow = isOAuth && !oauthUiHidden && (!supportsApiKey || authMode === 'oauth');
 
   useEffect(() => {
     if (!selectedVendor || !isOAuth || !supportsApiKey) {
       return;
     }
+    if (oauthUiHidden) {
+      setAuthMode('apikey');
+      return;
+    }
     setAuthMode(selectedVendor.defaultAuthMode === 'api_key' ? 'apikey' : 'oauth');
-  }, [selectedVendor, isOAuth, supportsApiKey]);
+  }, [selectedVendor, isOAuth, supportsApiKey, oauthUiHidden]);
 
   useEffect(() => {
     if (selectedType !== 'ark') {
@@ -1369,7 +1374,7 @@ function AddProviderDialog({
                 </div>
 
                 {/* Auth mode toggle for providers supporting both */}
-                {isOAuth && supportsApiKey && (
+                {isOAuth && supportsApiKey && !oauthUiHidden && (
                   <div className="flex rounded-xl border border-black/10 dark:border-white/10 overflow-hidden text-meta font-medium shadow-sm bg-transparent p-1 gap-1">
                     <button
                       onClick={() => setAuthMode('oauth')}
diff --git a/src/lib/providers.ts b/src/lib/providers.ts
index 31b7835..b9da364 100644
--- a/src/lib/providers.ts
+++ b/src/lib/providers.ts
@@ -85,6 +85,8 @@ export interface ProviderTypeInfo {
   codePlanDocsUrl?: string;
   /** If true, this provider is not shown in the "Add Provider" dialog. */
   hidden?: boolean;
+  /** If true, hide OAuth sign-in controls in the add-provider UI (logic remains enabled). */
+  hideOAuthUi?: boolean;
 }
 
 export type ProviderAuthMode =
@@ -155,6 +157,7 @@ export const PROVIDER_TYPE_INFO: ProviderTypeInfo[] = [
     requiresApiKey: true,
     isOAuth: true,
     supportsApiKey: true,
+    hideOAuthUi: true,
     defaultModelId: 'gpt-5.5',
     showModelId: true,
     modelIdPlaceholder: 'gpt-5.5',