Codex in ChatGPT app: Mac control via iPhone Apfelpatient

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OpenAI is bringing its coding agent Codex to the iPhone – not as a standalone app, but directly into the existing ChatGPT mobile app. This allows users to monitor, control, and restart ongoing Codex sessions from their Mac using their smartphone. Users thus gain a tool that seamlessly connects programming work between desktop and mobile devices.

Codex remains a standalone application on Mac, but mobile access now runs through the ChatGPT app on iPhone and Android. OpenAI describes the update as a preview feature and emphasizes that the actual computing work remains where Codex is installed—on a MacBook, Mac mini, or a remote development machine. The announcement aligns with the company's recent roadmap, which increasingly places Codex at the heart of its product strategy and has halved the price of ChatGPT Pro specifically for Codex users.

Here's how to pair a Mac and iPhone

The setup is intentionally streamlined. Current versions of the Codex Mac app and the ChatGPT Mobile app are required. A new "Codex mobile" section now appears in the Mac interface, displaying a QR code. Scanning this code with an iPhone establishes the connection.

Once paired, the mobile app loads the current status of the Mac session and imports active chats and ongoing projects from the desktop. Existing workflows can be continued from the iPhone, and new tasks can be initiated via message.

Which actions are possible from the iPhone

The ChatGPT app acts as a remote control for the coding agent. Users can check output, release commands, switch between different models, and insert new prompts into active threads from their iPhone.

Codex itself continues working on the Mac, accessing files, apps, and the browser to complete tasks. Screenshots, terminal output, diffs, test results, and approval requests are mirrored to the smartphone in real time. Push notifications are also provided as soon as Codex completes a task or requires input from the developer.

Data remains on the Mac

Sensitive information such as files, login credentials, and permissions never leaves the machine running Codex. Only the status information and results necessary for control are sent to the iPhone. OpenAI explicitly states that pairing should only occur between devices under the user's control – a logical point, since a paired smartphone effectively gains access to all operations of the coding agent.

Positioning in the competition for AI coding tools

The mobile expansion coincides with a market where several vendors are more closely integrating their AI-powered developer tools with Apple's platform. Anthropic fundamentally redesigned its Claude Code Mac app a few weeks ago to improve the user experience for developers on macOS. OpenAI, in turn, had previously enhanced Codex with the ability to control the Mac, generate images, and remember workflows.

With mobile access, the asymmetry between the two providers continues to grow: While Anthropic focuses on a full desktop experience, OpenAI shifts the control element to the smartphone and positions ChatGPT as a central hub from which coding agents are directed regardless of location.

Codex as a bridge between Mac and iPhone

For Apple users, this new feature offers a practical side effect: the Mac becomes the stationary computing hub, and the iPhone the mobile access point. Anyone who has started a long-running build or test can check on the go whether Codex encounters a bug or requires approval, without having to reach for their laptop.

This also shifts the role that ChatGPT plays on the iPhone. From a simple chat application, it becomes a control center for development work that actively collaborates with the Mac world. How deeply this integration will work in practice should become clear once the preview phase is complete and Codex mobile is more widely available. (Image: OpenAI)