Update app.py

app.py

@@ -176,10 +176,13 @@ custom_css = """
     min-height: 300px;
 }
 """
-selected_model = model_names[0]
+
 with gr.Blocks(analytics_enabled=False, css=custom_css) as demo:
     gr.HTML(title)
 
+    with gr.Row():
+        selected_model = gr.Radio(choices=model_names, value=model_names[0], label="Select a model")
+
     with gr.Accordion(label="System Prompt", open=False, elem_id="parameters-accordion"):
         system_message = gr.Textbox(
             elem_id="system-message",