Clear API key input when a different LLM is selected

app.py

@@ -105,6 +105,14 @@ def handle_error(error_msg: str, should_log: bool):
     st.error(error_msg)
 
 
+def reset_api_key():
+    """
+    Clear API key input when a different LLM is selected from the dropdown list.
+    """
+
+    st.session_state.api_key_input = ''
+
+
 APP_TEXT = _load_strings()
 
 # Session variables
@@ -133,6 +141,7 @@ with st.sidebar:
         options=[f'{k} ({v["description"]})' for k, v in GlobalConfig.VALID_MODELS.items()],
         index=GlobalConfig.DEFAULT_MODEL_INDEX,
         help=GlobalConfig.LLM_PROVIDER_HELP,
+        on_change=reset_api_key
     ).split(' ')[0]
 
     # The API key/access token
@@ -143,6 +152,7 @@ with st.sidebar:
             ' *Optional* for HF Mistral LLMs but still encouraged.\n\n'
         ),
         type='password',
+        key='api_key_input'
     )