Update README.md

README.md

@@ -109,7 +109,7 @@ Here is an example of a multi-turn conversation:
 ```python
 from mlx_lm import load, generate
 class QwenChatbot:
-    def __init__(self, model_name="Qwen/Qwen3-4B-MLX-4bit"):
+    def __init__(self, model_name="Qwen/Qwen3-1.7B-MLX-4bit"):
         self.model, self.tokenizer = load(model_name)
         self.history = []