Update app.py

app.py

@@ -375,7 +375,7 @@ if openai_api_key:
             with st.spinner("Getting answer..."):
                 prompt = f"Answer the following physics question: {phys_query}"
                 response = openai.ChatCompletion.create(
-                    model="gpt-4o-mini",
+                    model="gpt-3.5-turbo",
                     messages=[{"role": "user", "content": prompt}]
                 )
                 answer = response['choices'][0]['message']['content']