GPT 5.5 258k context window despite 400k advertised for gpt subs.
Resolved 💬 1 comment Opened Apr 24, 2026 by cyruszad Closed Apr 24, 2026
What version of the Codex App are you using (From “About Codex” dialog)?
Version 26.422.30944 (2080)
What subscription do you have?
The 20x Pro Sub ($200)
What platform is your computer?
Darwin 25.2.0 arm64 arm
What issue are you seeing?
258k window for gpt 5.5 vs 400k as shown.
What steps can reproduce the bug?
Start a new conversation with gpt 5.5 medium on vs code extension or codex app (already tried manually setting context in config file to 400k).
What is the expected behavior?
To subtract from 400k when starting new conversation.
Additional information
_No response_
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