Update app.py

app.py

@@ -25,7 +25,7 @@ with st.sidebar:
 
 # Initialize session state
 if "openai_model" not in st.session_state:
-    st.session_state['openai_model'] = "invidia/nemotron_4"
+    st.session_state['openai_model'] = "nvidia/nemotron-4-340b-instruct"
 
 if "messages" not in st.session_state:
     st.session_state.messages = [{"role": "system", "content": "You are a helpful assistant."}]