Test: Try gemma-3-27b-it model for chat

app.py

@@ -119,7 +119,7 @@ async def chat_with_gemini(request: ChatRequest):
         client = genai.Client()
         
         response = client.models.generate_content(
-            model="gemini-1.5-flash",
+            model="gemma-3-27b-it",
             contents=request.message
         )