---
title: "I've been previewing this in Codex for a few weeks - it's very good!\n\nHad some great results from it..."
source_name: "Simon Willison(@simonw)"
original_url: "https://x.com/simonw/status/2047386345245725008"
canonical_url: "https://www.traeai.com/articles/b7235ce8-0acc-4841-ad7a-2ee3cdcc9f13"
content_type: "tweet"
language: "中文"
score: 5
tags: []
published_at: "2026-04-23T18:45:17+00:00"
created_at: "2026-04-24T01:33:26.539767+00:00"
---

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

Had some great results from it...

Canonical URL: https://www.traeai.com/articles/b7235ce8-0acc-4841-ad7a-2ee3cdcc9f13
Original source: https://x.com/simonw/status/2047386345245725008

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Title: 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

URL Source: http://x.com/simonw/status/2047386345245725008

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# 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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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

Quote

![Image 3: Square profile picture](https://pbs.twimg.com/profile_images/1885410181409820672/ztsaR0JW_mini.jpg)

OpenAI

@OpenAI

·

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.

![Image 4](https://pbs.twimg.com/amplify_video_thumb/2047374439407620096/img/hr_j95BZ5LxS1EJT.jpg)

[6:45 PM · Apr 23, 2026](http://x.com/simonw/status/2047386345245725008)

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