Context window is still 258k

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

26.422.21637 (2056)

What subscription do you have?

Pro

What platform is your computer?

_No response_

What issue are you seeing?

I’m on ChatGPT Pro and using the latest Codex app version 26.422.21637.
GPT-5.5 is available in Codex, but the context window still shows ~258K tokens instead of the announced 400K context window.
I’ve tried updating the app and starting a new thread. Could you check whether 400K context for GPT-5.5 in Codex has rolled out to my account/workspace?

What steps can reproduce the bug?

1. update app to latest version : 26.422.21637
2. create a new thread and chat with agent

What is the expected behavior?

_No response_

Additional information

_No response_