For the Windows version, OpenAI created a dedicated sandbox that operates at the operating system level with restricted tokens, limited file-system access permissions, and separate sandbox user accounts. This setup allows AI agents to run directly in Windows environments such as PowerShell without requiring developers to rely on WSL or virtual machines.

OpenAI has also published the sandbox code as open source on GitHub.

The Windows app arrives just a few weeks after the release of the Mac version, which, according to OpenAI, surpassed one million downloads during its first week. Ahead of the Windows launch, more than 500,000 developers had already joined the waiting list.

Overall, Codex now has more than 1.6 million weekly active users, according to OpenAI. The application is available across all ChatGPT subscription tiers.