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codex - 💡(How to fix) Fix Context window is still 258k [2 comments, 3 participants]

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openai/codex#19306•Fetched 2026-04-24 10:38:52
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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

extent analysis

TL;DR

The issue might be resolved by verifying the rollout status of the 400K context window feature for GPT-5.5 in the Codex app.

Guidance

  • Check the official Codex app release notes or announcements to confirm if the 400K context window feature for GPT-5.5 has been fully rolled out.
  • Verify that the GPT-5.5 model is correctly selected and configured in the Codex app.
  • Try resetting the app settings to their default values to ensure no custom settings are interfering with the feature.
  • Reach out to the Codex support team to inquire about the feature's availability for the user's specific account or workspace.

Notes

The issue may be related to a gradual rollout of the feature or account-specific configurations, and further investigation is needed to determine the cause.

Recommendation

Apply workaround: Reach out to the Codex support team to confirm the feature's availability and rollout status, as the issue might be related to a partial or account-specific rollout.

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codex - 💡(How to fix) Fix Context window is still 258k [2 comments, 3 participants]