OpenAI's GPT-Codex-5.3 is here
Today, OpenAI launched the new GPT-Codex-5.3 model, and it's already available in the Codex CLI and in the newly launched Codex macOS app. You can see my post on X about the same, I have included screenshots there.
OpenAI claims for the new GPT-Codex-5.3 model to be a lot better than the previous 5.2 model. As you can see in the above screenshot and can also read what they have to explain here:
GPT‑5.3-Codex also better understands your intent when you ask it to make day-to-day websites, compared to GPT‑5.2-Codex.
At the time of writing this, there's no mention of the new model on their models page.
I'm still trying this out, and will keep this page updated with new info.
Also, Anthropic's Claude Opus 4.6 was also launched today.
Update
Matt Shumer had early access to the new GPT-Codex-5.3 and he has written a detailed review of the model. He claims:
Runs can go 8+ hours... and I come back to working code + live deployments.
Very interesting.
Unable to see the new model in the Codex CLI?
I see some people complaining about not seeing the GPT-Codex-5.3 model in the Codex CLI, so first, you need to update the CLI tool by running the following command:
npm i -g @openai/codexAnd then the new model will automatically start showing when you run /model in Codex CLI.
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