- GPT-5.3-Codex can now both operate a computer and write code
- It’s also faster, uses fewer tokens, and can be justified mid-flow
- Codex 5.3 was even used to build itself and the team was “blown away”
OpenAI has launched a new and upgraded version of Codex, which the company says is about much more than just performance updates.
With GPT-5.3-Codex, the platform moves from being a code writer and reviewer to a computing agent capable of handling many tasks that developers are likely to perform on their machines. Of course, stronger reasoning and knowledge are also part of the package.
For example, GPT-5.3 Codex is 25% faster than version 5.2 and uses fewer tokens, supporting longer and more complex tasks.
GPT-5.3 Codex is a huge upgrade over 5.2
In addition to scoring well across the SWE-Bench Pro and Terminal-Bench benchmarks, the GPT-5.3-Codex also posted strong scores across OSWorld (computer use tasks) and GDPval (knowledge work across 44 occupations).
Some of Codex 5.3’s use cases include building complex games and web apps from scratch, self-iterating over millions of tokens with little or no additional human input. But when it comes to human collaboration, users can question and redirect the Codex midway through rather than waiting for it to finish.
In another big first, the GPT-5.3 Codex has become the first OpenAI model to help build itself. “The Codex team used early versions to debug its own training, manage its own implementation, and diagnose test results and evaluations,” the announcement reads. “Our team was blown away by how much Codex was able to accelerate its own development.”
All paid ChatGPT subscriptions can now access the GPT-5.3 Codex on the app, CLI, IDE extension and web. And it comes just days after the ChatGPT maker launched a dedicated Codex app on macOS.
With this tool, Codex “moves beyond writing code to use it as a tool to operate a computer and complete work end-to-end,” OpenAI wrote.
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