Codex
A coding agent that builds with you. Describe what you want; Codex writes the files, shows you every change, previews it live, and hands you the finished project.
How a task goes
- You describe the taskA new app, a feature, a bug, or a question about the code. Start from a blank project, a website, Python or React.
- Codex reads your files and plansIt sees the whole project, so changes fit together. It can read documentation on the web when needed.
- It writes the changesYou see each file being written, then a summary with lines added and removed.
- You check and decideOpen the diff, preview the site, run the Python, or undo the whole task in one click.
Everything in one workspace
Live preview
Websites open right next to the code, with CSS and JavaScript files connected automatically.
Run Python and JavaScript
Scripts run safely inside your browser, and the output appears in the console.
Undo any task
Every task is a checkpoint. Look at the exact changes or roll them back.
Edit it yourself
A real code editor with highlighting. Save with Ctrl+S, and Codex sees your edits next time.
Bring your code
Upload files or a whole .zip project, and ask Codex to explain, fix or extend it.
Take it with you
Download the project as a zip whenever you like, ready for your hosting.
About Codex
Do I need to install anything?
No. Codex runs in your browser. Python runs in the browser too, so nothing touches your computer.
What can it build?
Websites, landing pages, small web apps and games, React apps without a build step, Python scripts and more. For big existing projects, upload the files you want help with.
Is my code private?
Your workspaces are visible only to your account. You can delete a workspace at any time.
Does it cost extra?
Codex is included in your Code GPT account. Each task counts towards your daily message limit.