diff --git a/extensions/google/provider-catalog.ts b/extensions/google/provider-catalog.ts
index 284ddeb0cc2..cf087418ec9 100644
--- a/extensions/google/provider-catalog.ts
+++ b/extensions/google/provider-catalog.ts
@@ -35,6 +35,15 @@ const GOOGLE_GEMINI_TEXT_MODELS: ModelDefinitionConfig[] = [
     contextWindow: 1_048_576,
     maxTokens: 65_536,
   },
+  {
+    id: "gemini-3.5-flash",
+    name: "Gemini 3.5 Flash",
+    reasoning: true,
+    input: ["text", "image"],
+    cost: GOOGLE_GEMINI_COST,
+    contextWindow: 1_048_576,
+    maxTokens: 65_536,
+  },
   {
     id: "gemini-3.1-pro-preview",
     name: "Gemini 3.1 Pro Preview",
diff --git a/extensions/google/provider-models.ts b/extensions/google/provider-models.ts
index b381d543779..2690ca9a513 100644
--- a/extensions/google/provider-models.ts
+++ b/extensions/google/provider-models.ts
@@ -17,6 +17,7 @@ const GEMINI_3_1_FLASH_LITE_PREFIX = "gemini-3.1-flash-lite";
 const GEMINI_3_1_FLASH_PREFIX = "gemini-3.1-flash";
 const GEMINI_3_FLASH_LITE_PREFIX = "gemini-3-flash-lite";
 const GEMINI_3_FLASH_PREFIX = "gemini-3-flash";
+const GEMINI_3_5_FLASH_PREFIX = "gemini-3.5-flash";
 const GEMINI_PRO_LATEST_ID = "gemini-pro-latest";
 const GEMINI_FLASH_LATEST_ID = "gemini-flash-latest";
 const GEMINI_FLASH_LITE_LATEST_ID = "gemini-flash-lite-latest";
@@ -188,6 +189,7 @@ export function resolveGoogleGeminiForwardCompatModel(params: {
     };
   } else if (
     lower.startsWith(GEMINI_3_1_FLASH_PREFIX) ||
+    lower.startsWith(GEMINI_3_5_FLASH_PREFIX) ||
     lower.startsWith(GEMINI_3_FLASH_PREFIX) ||
     lower === GEMINI_FLASH_LATEST_ID
   ) {