OpenAI has brought its Codex coding agent to the ChatGPT mobile app, providing iPhone and Android users with remote access to Codex sessions running on a Mac.

"Codex is now in the ChatGPT mobile app so you can stay in the loop from anywhere while Codex gets work done across your laptops, devboxes, or remote environments," said OpenAI, announcing the feature.

Codex remains a standalone app on Mac, but the mobile integration lives inside the existing ChatGPT app on iPhone and Android. Setup is pretty simple. First, update the Codex Mac app and ChatGPT mobile app, then select the new "Codex mobile" section in the Mac app interface. Scan the QR code it shows with your phone, and you're done.

Once connected, the mobile app loads the live state from the Mac where Codex is running, and you can pick up active chats or projects from the desktop, get notifications when Codex finishes a task or needs input, and begin new tasks by sending a message from your phone.

From the ChatGPT app, users can also review outputs, approve commands, switch between models, and add new prompts across active threads. Files, credentials, and permissions stay on the machine where Codex is operating, while screenshots, terminal output, diffs, test results, and approval requests flow back to the phone in real time.

OpenAI notes that Codex will access the desktop's files, apps, and browser to complete tasks sent from a phone, and warns users to only pair devices they own and trust.

The feature follows OpenAI's recent launch of a Codex Chrome extension, which lets the agent work directly in the browser to test web apps and pull context across tabs.

OpenAI says support for remotely accessing Codex for Windows will follow soon.