# GPT‑5-Codex and upgrades to Codex

<https://simonwillison.net/2025/Sep/15/gpt-5-codex/#atom-everything>

- Host: [simonwillison.net](https://links.thingelstad.xyz/hosts/simonwillison.net/)
- Saved: September 15, 2025 (2025-09-16T00:40:52Z)
- Record: https://links.thingelstad.xyz/links/1939e7701f87/
- JSON: https://links.thingelstad.xyz/links/1939e7701f87.json

## What Jamie wrote

OpenAI doesn't have the cachet that they would like to have in coding tools, but they certainly aren't going to give up. This space is [moving so fast](https://openai.com/index/introducing-upgrades-to-codex/).

## Facts

- Kind: [Page](https://links.thingelstad.xyz/kinds/page/)

## Appears in

- [WT327: Weekly Thing 327 / Prototypes, Tahoe, UTF-8](https://weekly.thingelstad.com/archive/327/), Briefly

## Same host

- [Beyond Vibe Coding](https://links.thingelstad.xyz/links/68fbf89f5969/) (simonwillison.net, September 4, 2025)
- [My review of Claude’s new Code Interpreter, released under a very confusing name](https://links.thingelstad.xyz/links/e9d278348b21/) (simonwillison.net, September 11, 2025)
- [Claude Sonnet 4.5 is probably the “best coding model in the world” (at least for now)](https://links.thingelstad.xyz/links/a91517639238/) (simonwillison.net, October 1, 2025)
- [Designing agentic loops](https://links.thingelstad.xyz/links/47276662c5a5/) (simonwillison.net, October 1, 2025)
- [Vibe engineering](https://links.thingelstad.xyz/links/532243c2bf87/) (simonwillison.net, October 16, 2025)

## Saved the same week

- [ChatGPT Memory and the Bitter Lesson | Shlok Khemani](https://links.thingelstad.xyz/links/3e8e5ac9081c/) (shloked.com, September 15, 2025)
- [UTF-8 is a Brilliant Design — Vishnu's Pages](https://links.thingelstad.xyz/links/05c3fc2ce838/) (iamvishnu.com, September 15, 2025)
- [iOS and iPadOS 26: The MacStories Review - MacStories](https://links.thingelstad.xyz/links/ffcdb5da35e9/) (macstories.net, September 15, 2025)
- [macOS 26 Tahoe: The MacStories Review - MacStories](https://links.thingelstad.xyz/links/037dae5f71e1/) (macstories.net, September 15, 2025)
- [All Omni Apps Ready; Liquid Glass and Apple Intelligence Journeys Begin - The Omni Group](https://links.thingelstad.xyz/links/c43ac8d4ffbe/) (omnigroup.com, September 15, 2025)

## Elsewhere

- Wayback Machine: https://web.archive.org/web/*/https://simonwillison.net/2025/Sep/15/gpt-5-codex/#atom-everything