- GPT-5.3-Codex can now operate a computer in addition to writing code
- It’s also faster, uses fewer tokens, and can be reasoned mid-stream.
- Codex 5.3 was even used to build and the team was “impressed”
OpenAI has released a new and improved version of Codex that the company says is much more than just performance updates.
With GPT-5.3-Codex, the platform goes from being a code writer and reviewer to an agent using a computer 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 big update over 5.2
In addition to scoring well in the SWE-Bench Pro and Terminal-Bench benchmarks, GPT-5.3-Codex also earned strong scores in OSWorld (computer usage tasks) and GDPval (knowledge work in 44 occupations).
Some of the use cases for Codex 5.3 include building complex games and web applications from scratch, iterating over millions of tokens with little to no additional human intervention. But when it comes to human collaboration, users can question and redirect the Codex mid-flow instead of waiting for it to finish.
As for another important novelty, GPT-5.3-Codex has become the first OpenAI model that helps build itself. “The Codex team used early versions to debug their own training, manage their own implementation, and diagnose test results and evaluations,” the announcement reads. “Our team was impressed by how much Codex was able to accelerate its own development.”
All paid ChatGPT plans can now get access to GPT-5.3-Codex in the app, CLI, IDE extension and web. And it comes just days after the creator of ChatGPT launched a dedicated Codex app on macOS.
With this tool, “Codex is going beyond writing code to using it as a tool to operate a computer and complete the job from start to finish,” OpenAI wrote.
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