<p>GPT-5.3-Codex is now available for all developers in the Responses API.

Start building with it today.
https://t.co/8ym3r1GTaT https://t.co/6R9youFf8G</p>

OpenAI Developers

GPT-5.3-Codex is here.

It advances both frontier coding performance and professional knowledge capabilities together in a single model.

https://t.co/mAyt3snLY9 https://t.co/NIcq8AWwee

GPT-5.3-Codex is now generally available to all developers through OpenAI's Responses API, opening access for building applications with the model.

GPT-5.3-Codex is now available for all developers in the Responses API. Start building with it today. https://t.co/8ym3r1GTaT https://t.co/6R9youFf8G