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writing/news/2026/05
● NewsMay 31, 2026·6 min read

OpenAI Expands Codex Computer Use to Windows with Mobile Remote Control

OpenAI launched Codex computer use for Windows on May 29, letting the AI coding agent take direct control of desktop applications while developers steer, monitor, and approve tasks remotely from their iOS or Android phone.

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OpenAI extended its Codex computer-use capability to Windows on May 29, 2026, marking a significant escalation in agentic AI tooling for developers. The update lets the Codex coding agent see, click, type, and navigate Windows desktop applications autonomously — while users manage, monitor, and redirect tasks remotely from the ChatGPT mobile app on iOS or Android.

Key Highlights

  • Codex can now control Windows desktop applications directly, not just generate code
  • Mobile remote control via ChatGPT app: start threads, approve actions, review diffs and screenshots
  • Activate with @computer or a specific app name (e.g. @Paint) in Codex prompts
  • Computer use was macOS-only since April 2026; Windows support now brings parity
  • App-specific permission approvals keep the user in control of what Codex can access
  • Not yet available in the European Economic Area, United Kingdom, or Switzerland

How It Works

Once enabled in Codex settings, users can reference @computer or any specific application in their prompt — for example, "Open @Chrome, navigate to our staging URL, and verify the checkout flow works end-to-end." Codex then takes over the foreground window on Windows, viewing the screen, sending keyboard input, clicking interface elements, and reporting back with screenshots and terminal output.

On macOS, Codex supports an additional locked mode that lets it operate while the machine is sleeping with short-lived authorization windows and auto-relocking if local input is detected. Windows currently runs in foreground mode only, meaning the machine remains active while Codex works.

Mobile Remote Control

The most striking addition is the ability to steer an ongoing Codex session from a smartphone. With the ChatGPT mobile app connected to a Windows host, developers can:

  • Launch new Codex tasks from anywhere
  • Monitor live progress through screenshots and terminal output
  • Send follow-up instructions mid-task
  • Approve or reject proposed actions before they execute
  • Review diffs and test results from the phone

This closes the loop that opened in mid-May when OpenAI added Codex to the ChatGPT mobile app but with Mac-only desktop support. Windows developers now have the same capability.

Designed for Developer Workflows

OpenAI positioned computer use for scenarios where command-line tools fall short. Documented use cases include:

  • Testing desktop applications during development, navigating GUIs that lack CLI interfaces
  • Browser-based verification workflows, such as end-to-end checkout or form testing
  • Bug reproduction in graphical interfaces that are hard to script
  • UI settings configuration across multiple applications
  • Cross-application workflows that require switching between tools

The official documentation describes it as filling the gap "where your project context lives" — on the Windows desktop — rather than only in terminal sessions.

Security Model

OpenAI built a tiered permission system to limit blast radius. Each application Codex can access requires explicit user approval; approvals can be revoked at any time from settings. Terminal automation and administrator authentication are blocked by default, preventing privilege escalation. Users can build an "always allow" list for trusted applications to reduce friction on repeated workflows.

Impact on the AI Agent Landscape

The expansion signals a clear direction: AI coding agents are moving from generating code snippets inside editors to controlling the full development environment. Rather than being a smart autocomplete, Codex now positions itself as a background worker that keeps running while the developer steps away — checking progress, approving decisions, and redirecting effort from a mobile screen.

This follows a broader competitive pattern. Anthropic's Claude Code, GitHub Copilot, and Google's Project Mariner are all adding computer-use and agentic execution features. Windows support for Codex closes a notable gap given that the majority of enterprise development environments run on Windows machines.

Availability and Pricing

Computer use is included at no extra cost for existing ChatGPT Plus, Team, and Enterprise subscribers. New subscribers receive a 14-day free trial. The feature is currently unavailable in the European Economic Area, United Kingdom, and Switzerland.

Source: OpenAI Developers — Computer Use