Update app.py

app.py

@@ -2,10 +2,11 @@ import openai
 import streamlit as st
 
 st.title("ChatGPT-Clone")
-
+    
 if "openai_model" not in st.session_state:
     st.session_state["openai_model"] = "gpt-3.5-turbo-16k"
 
+
 if "messages" not in st.session_state:
     st.session_state.messages = []
 
@@ -14,6 +15,10 @@ for message in st.session_state.messages:
         st.markdown(message["content"])
 
 openai_api_key = st.sidebar.text_input("OpenAI API Key", type="password")
+
+if "openai_api_key" not in st.session_state:
+    st.session_state["openai_api_key"] = openai_api_key
+    
 if not openai_api_key:
     st.info("Please add your OpenAI API key to continue.")
     st.stop()