Update app.py

app.py

@@ -31,7 +31,7 @@ def create_newsletter(contents):
         prompt += f"Title: {title}\nURL: {url}\n\n{body}\n\n"
 
     response = openai.chat.completions.create(
-        model="gpt-3.5-turbo",
+        model="gpt-4o-mini",
         messages=[
             {"role": "system", "content": "You are a helpful assistant."},
             {"role": "user", "content": prompt}