OpenAI brought Codex Computer Use to Windows 11 — until now it was Mac-only. With Codex app v26.527, the agent can operate graphical interfaces directly: move the mouse, type, click, test apps, reproduce bugs. It’s exactly the kind of feature that makes you perk up as a Claude user — because this is where the race for the desktop gets real.
What Codex Can Do on Windows
Computer Use is meant for tasks where the command line or structured integrations aren’t enough: checking a desktop app, driving a browser, changing app settings, or reproducing a bug that only shows up in the GUI. Codex sees the screen and acts on it.
The catch on Windows: the agent runs on the active desktop and can’t work in the background while you keep using the same Windows session. So Codex takes over the mouse and the foreground while the task runs. On the Mac, multiple agents can run in parallel — on Windows that’s not the case (yet).
Keep Steering From Your Phone
Handy touch: you can connect to a Windows machine and keep directing it from your phone. Start a task, walk away, check in via the ChatGPT app, and send follow-up instructions. If you want the machine to work unattended, keep it unlocked and online — or just run Codex inside a Windows VM.
Sandbox Instead of Blind Trust
OpenAI leans on containment: Codex only sees and acts in the apps you allow, and it asks for permission before using an app during a task. When Codex runs natively on Windows, a Windows sandbox blocks filesystem writes outside the working folder and prevents network access without your explicit approval.
That sounds familiar — and that’s the interesting part. Anthropic just described the same core idea in detail: don’t cap an agent’s blast radius through constant prompting, but through hard environment boundaries. Sandbox, restricted file access, no network without approval. Two labs, the same lesson.
My Take
Computer Use on the desktop isn’t a gimmick anymore — it’s becoming a standard feature that any serious coding tool needs. Claude has driven Mac and Windows for a while, and now Codex follows on Windows. For us as users, that’s good: more choice, more speed. One small limitation, though — Codex Computer Use isn’t available at launch in the EU, the UK, and Switzerland. A shame, but by now we kind of know the drill.
Sources: OpenAI: Building a safe, effective sandbox to enable Codex on Windows, OpenAI Developers: Computer Use – Codex app