codex - 💡(How to fix) Fix GPT-5.5 model context length is unstable

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What version of the Codex App are you using (From “About Codex” dialog)?

latest

What subscription do you have?

gpt-plus

What platform is your computer?

win11

What issue are you seeing?

上下文长度为1M时候显示为950K,但是切换聊天后就变成了258k,Codex 重启后会把 models_cache.json 自动刷新回 272000,会导致上下文直接异常,从大于258被迫变为了258以下的,上下文被打断非常影响使用!

What steps can reproduce the bug?

不写步骤了,很明显的问题,Codex 当前版本不是单纯读取 models_cache.json,还可能有客户端内部限制、服务端下发限制,或者前端显示的是有效压缩窗口而不是最大模型窗口。

What is the expected behavior?

No response

Additional information

No response

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codex - 💡(How to fix) Fix GPT-5.5 model context length is unstable