feat: add Gemini 3 Flash model support (#260)

Co-authored-by: Letta <noreply@letta.com>

.github/workflows/ci.yml

@@ -119,7 +119,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        model: [gpt-5-minimal, gpt-4.1, sonnet-4.5, gemini-pro, glm-4.6, haiku]
+        model: [gpt-5-minimal, gpt-4.1, sonnet-4.5, gemini-pro, gemini-3-flash, glm-4.6, haiku]
     steps:
       - name: Checkout
         uses: actions/checkout@v4

src/models.json

@@ -372,6 +372,14 @@
     "isFeatured": true,
     "updateArgs": { "context_window": 180000, "temperature": 1.0 }
   },
+  {
+    "id": "gemini-3-flash",
+    "handle": "google_ai/gemini-3-flash-preview",
+    "label": "Gemini 3 Flash",
+    "description": "Google's fastest Gemini 3 model",
+    "isFeatured": true,
+    "updateArgs": { "context_window": 180000, "temperature": 1.0 }
+  },
   {
     "id": "gemini-flash",
     "handle": "google_ai/gemini-2.5-flash",