Update app.py

app.py

@@ -39,7 +39,7 @@ def generate_natural_language_description(tags, api_key=None):
         try:
             openai.api_key = api_key.strip()
             response = openai.ChatCompletion.create(
-                model="gpt-4",
+                model="gpt-4o",
                 messages=[
                     {"role": "system", "content": (
                         "You are a helpful assistant that generates creative painting/prompt descriptions. "