Update app.py

app.py

@@ -48,7 +48,7 @@ st.markdown("""
 @st.cache_resource
 def get_openai_model():
     """Load OpenAI GPT-3.5-Turbo model once (cached) for efficiency."""
-    return ChatOpenAI(model_name="gpt-3.5-turbo", temperature=0.7)
+    return ChatOpenAI(model_name="gpt-4o-mini-2024-07-18", temperature=0.7)
 
 @st.cache_resource
 def get_vectorstore():