OpenAI has integrated Codex, its AI coding assistant, into the ChatGPT iOS app as of May 18, 2025. This update, available in version 1.2025.133, allows users to start coding tasks, view and edit diffs, request changes, and push pull requests directly from their iPhones. The app also supports live activity tracking on the lock screen and seamless transition between mobile and desktop environments. Users have noted the GitHub integration as a positive feature, although some have pointed out the absence of the ability to upload screenshots. This enhancement aims to provide developers with greater flexibility and productivity by enabling coding workflows on the go.