Update app.py

app.py

@@ -65,7 +65,7 @@ def generate_ablation_design(
     client = OpenAI(api_key=api_key)
     try:
         response = client.chat.completions.create(
-            model="gpt-4o-mini",
+            model="gpt-4.1",
             messages=messages,
             max_tokens=2048,
             temperature=1,