Update app.py

app.py

@@ -9,7 +9,7 @@ openai.api_key = os.getenv("OPENAI_API_KEY")
 def chat_with_openai(input_text):
     try:
         response = openai.Completion.create(
-            engine="gpt-4o",  # Use the model you want (e.g., 'gpt-3.5-turbo', 'gpt-4')
+            engine="gpt-4o-mini",  # Use the model you want (e.g., 'gpt-3.5-turbo', 'gpt-4')
             prompt=input_text,
             max_tokens=150,
             n=1,