Simon Willison(@simonw)

I've been previewing this in Codex for a few weeks - it's very good! Had some great results from it...

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I've been previewing this in Codex for a few weeks - it's very good!

Had some great results from it...

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Had some great results from it having it run security reviews against code written using other models" / X

Simon Willison on X: "I've been previewing this in Codex for a few weeks - it's very good! Had some great results from it having it run security reviews against code written using other models" / X

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Simon Willison

@simonw

I've been previewing this in Codex for a few weeks - it's very good! Had some great results from it having it run security reviews against code written using other models

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OpenAI

@OpenAI

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7h

Introducing GPT-5.5 A new class of intelligence for real work and powering agents, built to understand complex goals, use tools, check its work, and carry more tasks through to completion. It marks a new way of getting computer work done. Now available in ChatGPT and Codex.

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6:45 PM · Apr 23, 2026

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