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A flurry of new releases from OpenAI today under the Codex brand, including a new GPT-5-Codex speciality coding model simonwillison.net/2025/Sep/15/...

simonwillison.netGPT‑5-Codex and upgrades to CodexOpenAI half-released a new model today: GPT‑5-Codex, a fine-tuned GPT-5 variant explicitly designed for their various AI-assisted programming tools. I say half-released because it's not yet available ...

Tom Resing

@tomresing.com

I don’t know if I’ve tried the app entry point yet. Just asked it to retry a previous request with the new model. Its first attempt on that one was unusable. However, I think I’m trying to make it act more life Claude artifacts and it’s not.

15/9/25, 9:48 pm0 reposts0 likes

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