Update app.py

app.py

@@ -66,7 +66,7 @@ if uploaded_file and question and openai_api_key:
         # 4) Erstelle Retrieval-Kette mit LLM
         llm = ChatOpenAI(
             temperature=0,
-            model_name="gpt-3.5-turbo",
+            model_name="gpt-4o-mini",
             openai_api_key=openai_api_key
         )