§ feed · storyline

GPT-5.5 launches outside OpenAI API as competitive pressure mounts

OpenAI releases GPT-5.5 outside its public API, currently accessible only via the Codex tool's backend, while competition with Anthropic intensifies.

Apr 23 · 22:06:12 · primary fetch1 sourceupdated Apr 23 · 22:06:12

GPT-5.5 is out but not yet in the OpenAI API - but in the ongoing battle with Anthropic over OpenClaw OpenAI made their Codex tool's private backend API a semi-approved mechanism...

and that one has GPT-5.5... So I used it to draw some pelicans simonwillison.net/2026/Apr/23/...

read full article on bsky.app ↗

§ sources1 publication · timeline below

bsky.appGPT-5.5 is out but not yet in the OpenAI API - but in the ongoing battle with Anthropic over OpenClaw OpenAI made their Codex tool's private backend API a semi-approved mechanism... and that one has …primary22:06:12