GPT-5.5 may not be in the official OpenAI API... but it's available via the apparently approved-of C...

So I used that to make these pelicans (default and xhigh)! https://t.co/kIx2wnhpqD https://t.co/PP1JXhtEiM" / X
GPT-5.5 may not be in the official OpenAI API... but it's available via the apparently approved-of Codex API backdoor So I used that to make these pelicans (default and xhigh)! simonwillison.net/2026/Apr/23/gp

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Romain Huet
@romainhuet
Mar 30
Replying to @bygregorr
We want people to be able to use Codex, and their ChatGPT subscription, wherever they like! That means in the app, in the terminal, but also in JetBrains, Xcode, OpenCode, Pi, and now Claude Code. That’s why Codex CLI and Codex app server are open source too! !Image 3: 🙂