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ValentineC | on: Claude Fable 5
GPT 5.5 Pro is only in chat/API, not Codex.
Supermancho | parent
From https://openai.com/index/introducing-gpt-5-5/

In Codex, GPT‑5.5 is available for Plus, Pro, Business, Enterprise, Edu, and Go plans with a 400K context window.