Update app.py

app.py

@@ -54,7 +54,7 @@ def predict(message, history):
     messages.append({"role": "user", "content": prep})
     
     stream = client.chat.completions.create(
-        model="gpt-4.5",
+        model="gpt-4.5-preview-2025-02-27",
         messages=messages,
         temperature=1.0,
         stream=True