A coding agent that helps you build and ship with AI—powered by ChatGPT.
Available on macOS and Windows
From routine pull requests to your hardest problems, Codex reliably completes tasks end to end, like building features, complex refactors, migrations, and more, powered by OpenAI’s frontier coding models.
Task
Add exponential backoff to the notifications APIThe Codex app is a command center for agentic coding. With built-in worktrees and cloud environments, agents work in parallel across projects, completing weeks of work in days.
Active agents
With Skills, Codex goes beyond writing code to directly contribute to the work that turns pull requests into products, like code understanding, prototyping, and documentation, aligned with your team’s standards.
Loaded skills
With Automations, Codex works unprompted, picking up routine but important work like issue triage, alert monitoring, CI/CD, and more, so you can stay focused on building.
Today
Codex raises baseline quality with more thorough designs, comprehensive testing, and high-signal code review—so issues are caught early and your team ships with confidence.
Use Codex across multiple surfaces, all connected by your ChatGPT account.
“At Wonderful, Codex CLI has completely replaced every other agentic harness for our core technology and architecture work requiring deep reasoning and understanding.”
“At Harvey, Codex transformed how we build by cutting early iteration time by 30–50%, freeing engineers to focus on system design and high-leverage decisions.”
“With Codex, we ship in a weekend what previously took a quarter. It’s become our go-to for projects we wouldn’t have otherwise been able to take on.”
“Codex PR reviews catch bugs our team would have missed, and we ship with more confidence because of it.”
“Codex performed best in our backend Python code-review benchmark and consistently found the hard bugs that other bots missed.”
“Codex handled the refactor and test generation, delivering fully tested code I handed back fast.”
A coding agent that helps you build and ship with AI—powered by ChatGPT.
Download for macOS