chat4us gpt-5: ChatGPT 中文版：国内免费使用 GPT-5 指南（支持 GPT-5 & GPT-4o，无需翻墙）【2025 10月最新更新】 The model was trained to use a python tool to perform calculations and other actions as part of its chain-of-thought. To improve performance the tool caches requests so that the model