Update app.py

app.py

@@ -39,7 +39,7 @@ def explain_expression(input_text, source_lang, target_lang):
 
     # OpenAI API 호출
     response = openai.ChatCompletion.create(
-        model="gpt-4",
+        model="gpt-4o-mini",
         messages=[{"role": "user", "content": prompt}],
         temperature=0.7
     )