Update app.py

app.py

@@ -5,15 +5,18 @@ import os
 client = OpenAI(api_key=os.getenv("OPENAI_API_KEY"))
 
 def chat(message):
-    response = client.chat.completions.create(
-        model="gpt-5-nano",
-        messages=[
-            {"role": "system", "content": "You are a helpful assistant."},
-            {"role": "user", "content": message}
-        ]
-    )
-    return response.choices[0].message.content
+    try:
+        response = client.chat.completions.create(
+            model="gpt-4o-mini",
+            messages=[
+                {"role": "system", "content": "You are a helpful assistant."},
+                {"role": "user", "content": message}
+            ]
+        )
+        return response.choices[0].message.content
 
+    except Exception as e:
+        return f"API error: {str(e)}"
 
 iface = gr.Interface(
     fn=chat,