Update app.py

app.py

@@ -434,7 +434,7 @@ Provide specific, technical guidance focused on Gradio implementation details an
                 "Content-Type": "application/json"
             },
             json={
-                "model": "google/gemma3:27b",
+                "model": "google/gemma-3-27b-it",
                 "messages": messages,
                 "temperature": 0.7,
                 "max_tokens": 500