Update app.py

app.py

@@ -38,8 +38,9 @@ def app_login(intro_video):
    user_password = st.text_input(label="Password", type="password", placeholder="Please enter your password",label_visibility="collapsed",icon=":material/key:")
 
    speak_easy = os.environ["SPEAK_EASY"]                                         #    
+   users      = os.environ["USERS"]                                              #    
 
-   if st.button("Log in") and (user_password.lower()==speak_easy):               # 
+   if st.button("Log in") and (user_password.lower()==speak_easy) and user_name in users:               # 
       st.session_state.logged_in = True
       st.session_state.user_name = user_name
       print("User Name is: ",st.session_state.user_name)                         # log user name 
@@ -58,7 +59,7 @@ if "start_dir" not in st.session_state:
    st.session_state["start_dir"] = os.getcwd()                                   # start directory for file hierarchy 
 
 if "openai_model" not in st.session_state:
-   st.session_state["openai_model"] = "gpt-4.1-mini"                             # o4 is another option but this works best with markdown / latex etc.
+   st.session_state["openai_model"] = "gpt-5.2-pro"                              # advanced reasoning model with webtool support
 
 if "openai_client" not in st.session_state:
    API_KEY  = os.environ["API_KEY"]                                              # api key from environ / secrets