OpenAI's Codex app lands on Windows after topping a million Mac downloads in its first week

2026-03-04 · Source: The Decoder · Field: Technology & Digital — Artificial Intelligence & Machine Learning, Software Development & Engineering · Depth: Intermediate, quick

Summary

OpenAI has launched its Codex app for Windows, an AI-powered coding tool designed to assist developers by running multiple agents asynchronously, delegating repeatable tasks through "Automations", and connecting agents to tools via "Skills" without losing context. For the Windows version, OpenAI developed an OS-level sandbox with restricted tokens and file system access, enabling AI agents to operate directly in Windows environments like PowerShell, bypassing the need for WSL or virtual machines, and has open-sourced this sandbox code on GitHub. This release follows the Mac version's success, which achieved over a million downloads in its first week, with more than 500,000 developers on the Windows waiting list. OpenAI reports that Codex now serves over 1.6 million weekly active users and is accessible across all ChatGPT plans.

Key takeaway

OpenAI's AI-powered Codex app, which orchestrates multiple agents for coding tasks, is now available for Windows. It features a custom, open-source OS-level sandbox enabling direct agent execution in Windows environments like PowerShell, bypassing WSL/VMs. This broadens access for 1.6M+ weekly active users and simplifies AI agent integration for Windows developers across all ChatGPT plans.

Topics

• OpenAI Codex
• AI Coding Tools
• Developer Tools
• Windows Sandbox
• AI Agents

Code references

• openai/codex

Best for: NLP Engineer, Software Engineer, AI Engineer, Machine Learning Engineer

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Editorial summary, takeaway, and curation by AIssential. Original article published by The Decoder.