OpenAI brings Codex remote access to the ChatGPT mobile app

At a glance:

• OpenAI has integrated its Codex coding agent into the ChatGPT mobile app for iPhone and Android, enabling remote access to Codex sessions running on a Mac.
• Pairing is handled via QR code — users scan from their phone to sync with the desktop app and get real-time updates including terminal output, diffs, and approval prompts.
• Windows support is on the way, following the recent Codex Chrome extension launch and the GPT-5.5 model release.

How the mobile integration works

OpenAI has made Codex accessible from anywhere by embedding it inside the existing ChatGPT app on iPhone and Android. The setup process is straightforward: users update both the Codex Mac application and the ChatGPT mobile app, then select a new "Codex mobile" section within the Mac app interface. A QR code appears on screen — scanning it with a phone completes the pairing instantly. No additional accounts or configurations are required.

Once connected, the mobile app pulls the live state from the Mac where Codex is running. This means a user can walk away from their desk, open ChatGPT on their phone, and immediately see active chats, running projects, and the current status of any in-progress task. The experience is designed to feel like a seamless extension of the desktop session rather than a stripped-down companion.

What you can do from your phone

From the ChatGPT mobile app, users have meaningful control over Codex sessions. They can review outputs as they arrive, approve or reject commands before execution, switch between available models, and inject new prompts into active threads. Notifications fire when Codex finishes a task or requires human input, so nothing stalls silently in the background.

Importantly, files, credentials, and system permissions remain on the machine where Codex is operating — they never leave the Mac. What does travel back to the phone in real time are screenshots, terminal output, diffs, and test results, giving developers full visibility without exposing sensitive local data.

Security considerations

OpenAI has included an explicit warning with the feature: users should only pair devices they own and trust. Because Codex will access the desktop's files, applications, and browser to complete tasks initiated from a phone, the trust model is critical. The QR-code handshake helps ensure that pairing is deliberate, but the responsibility for device security still rests with the user. Anyone on a shared or untrusted network should be cautious about granting remote control-level access to their development environment.

OpenAI's broader push with Codex

The mobile integration follows a busy stretch for the Codex product. Just prior to this announcement, OpenAI shipped a Codex Chrome extension that lets the agent operate directly inside the browser — testing web apps and pulling context across open tabs. Together, these moves signal that OpenAI is building out Codex as a cross-platform, always-accessible coding assistant rather than a single-desktop tool.

The timing also lines up with the launch of GPT-5.5, which OpenAI says brings meaningful gains in agentic coding, computer use, and multi-step reasoning. Codex sessions running on the desktop can already take advantage of the newer model's improved planning and verification capabilities, and the mobile layer gives developers oversight of those smarter sessions from anywhere.