OpenAI’s Codex agentic coding app is now available on Windows.To say Codex has been a hit for OpenAI would be an understatement. The Codex App for Mac, which launched in early February, was downloaded more than 1 million times in the first week alone, and weekly active users now stand at 1.6 million.There will likely be quite a bit of demand for the Windows version, too: OpenAI says more than 500,000 developers were on the waitlist.As OpenAI stresses, the Windows version wasn’t just built to be compatible with Microsoft’s operating system but “for real Windows developer environments,” as an OpenAI spokesperson put it in an email to The New Stack.The app was built to offer native sandboxing and workflows, so that developers on Windows can use the tools they are already familiar with. By default, the app uses its own native Windows sandbox, but there is an option to use the Windows Subsystem for Linux and its tools as well.If you opt to go Windows-native, Codex for Windows uses OS-level controls such as restricted tokens and filesystem access control, ensuring that the agents can run in environments like PowerShell, Microsoft’s default shell for Windows.OpenAI’s Codex app for Windows (credit: OpenAI).For the most part, the Windows version looks and feels almost exactly like the Mac version. The same skills, automations, and support for worktrees are available on Windows. There are also some Windows-specific skills, including a WinUI skill for developers who write Windows apps.There are also some Windows-specific skills, including a WinUI skill for developers who write Windows apps.One thing that always sets Codex apart is that it focuses more on managing the agent than on the code itself. You can always see the diffs as needed and switch to your favorite IDE, but the default view focuses on your interactions with the agent. OpenAI describes this as “a new form factor designed as a command center for agents,” and that feels about right.The default model used for Codex is OpenAI’s recently launched coding-specific GPT-5.3-Codex models, with the ability to switch to GPT-5.2-Codex, GPT-5.1-Codex-Max, GPT-5.2, and, for tasks that need to run quickly, GPT-5.1-Codex-Mini. Users can also set the reasoning level for each model.Codex for Windows is now available for all ChatGPT Free, Go, Plus, Pro, Business, Enterprise, and Edu users.The post OpenAI’s Codex is now on Windows appeared first on The New Stack.