Update app.py

app.py

@@ -500,7 +500,7 @@ Set the environment variable `model` to change the model:
 
     models = get_model_list()
     bits = int(os.getenv("bits", 16))
-    model = os.getenv("model", models[1])
+    model = os.getenv("model", models[0])
     available_devices = os.getenv("CUDA_VISIBLE_DEVICES", "0")
     model_path, model_name = model, model.split("/")[0]
     if api_key: