diff --git a/backend/app/services/gemini_service.py b/backend/app/services/gemini_service.py
index 49f12c2..3e705c4 100755
--- a/backend/app/services/gemini_service.py
+++ b/backend/app/services/gemini_service.py
@@ -39,7 +39,7 @@ class GeminiService:
             http_options={"timeout": _FALLBACK_TIMEOUT_MS},
         )
         self.model = "gemini-3.1-pro-preview"
-        self.fallback_model = "gemini-3-flash-preview"
+        self.fallback_model = "gemini-3.1-flash-lite"
 
     async def _generate_content(
         self,