---
title: "GPT-5.5 may not be in the official OpenAI API... but it's available via the apparently approved-of C..."
source_name: "Simon Willison(@simonw)"
original_url: "https://x.com/simonw/status/2047406457302524397"
canonical_url: "https://www.traeai.com/articles/5f345f7f-40cc-417b-ad59-8a51324d483f"
content_type: "tweet"
language: "中文"
score: 5
tags: []
published_at: "2026-04-23T20:05:13+00:00"
created_at: "2026-04-24T01:33:26.270022+00:00"
---

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

Canonical URL: https://www.traeai.com/articles/5f345f7f-40cc-417b-ad59-8a51324d483f
Original source: https://x.com/simonw/status/2047406457302524397

## Summary

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## Key Takeaways

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## Content

Title: Simon Willison on 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)! https://t.co/kIx2wnhpqD https://t.co/PP1JXhtEiM" / X

URL Source: http://x.com/simonw/status/2047406457302524397

Markdown Content:
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](https://t.co/kIx2wnhpqD)

[![Image 1: It is a bit mangled to be honest - good beak, pelican body shapes are slightly weird, legs do at least extend to the pedals, bicycle frame is not quite right. (default reasoning level)](https://pbs.twimg.com/media/HGnZJfoasAAwtqq?format=png&name=small)](https://x.com/simonw/status/2047406457302524397/photo/1)

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[![Image 2: Pelican has gradients now, body is much better put together, bicycle is nearly the right shape albeit with one extra bar between pedals and front wheel, clearly a better image overall.](https://pbs.twimg.com/media/HGnZP5-bsAA7SKJ?format=png&name=small)](https://x.com/simonw/status/2047406457302524397/photo/2)

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Quote

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: 🙂](https://abs.twimg.com/emoji/v2/svg/1f642.svg)