OpenAI brings Codex to mobile ChatGPT, taking on Claude Code

OpenAI has announced the integration of its Codex model into the ChatGPT mobile app for both iOS and Android, effective May 14, 2026. This new functionality allows developers to monitor and actively steer coding tasks directly from their smartphones. Users can connect to their existing Codex environments—whether on a local laptop or a remote machine—enabling them to manage AI coding agents without needing to be physically at a desktop. The feature is designed to provide greater flexibility for developers who need to oversee complex coding workflows on the go.

This strategic expansion positions OpenAI's Codex as a direct competitor to Anthropic's Claude Code, a popular AI coding agent that also offers remote oversight capabilities. By embedding Codex into the widely-used ChatGPT app, OpenAI makes agent control accessible to a larger mobile-first developer audience. The move underscores the growing trend of AI coding agents becoming as essential as version control or CI/CD pipelines, with mobility now a key differentiator in the market.