OpenAI's Codex app is now on mobile via ChatGPT for iOS and Android. Here's what it does, how to set it up, how it compares to Claude Code mobile.

OpenAI’s integration of ChatGPT 5.5 and its Codex platform combines advanced language processing with autonomous coding capabilities to create a versatile system for tackling a wide range of tasks.

Codex users have been asking OpenAI for a way to remotely control sessions with the tool from ChatGPT on their phones. New text strings in the Android app reveal the company’s work towards this goal.

Codex is now available via the ChatGPT apps on Android and iOS. The mobile apps support remote access to active Codex sessions, including code reviews, approvals, model switching, and task management.

Codex is going mobile. The coding tool — which OpenAI launched approximately a year ago — has now been integrated into the ChatGPT app, allowing users to monitor and manage their development workflows ...

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