OpenAI Brings Codex to the ChatGPT Mobile App – Full Access for All Users

OpenAI announced that Codex is now available in preview on the ChatGPT mobile application for both Android and iOS, and the feature is open to all users, including those on the free plan.

The update emphasizes a higher synchronization rate, allowing developers to approve code, assign tasks, and monitor progress from any location, which the development community has welcomed as a transformative change.

More than four million users engage with Codex each week, and the new mobile collaboration mode addresses the growing need for AI‑assisted workflows that span multiple devices and contexts.

Within the app, users can view real‑time runtime status, explore Codex’s discoveries, see direction changes, approve subsequent steps, or add new ideas, while Codex continues to operate on laptops, Mac Mini, devboxes, or remote environments.

OpenAI explains that Codex runs behind a secure relay layer that protects trusted machines from direct exposure to the public internet and keeps session state and context synchronized across all devices logged into ChatGPT.

Typical mobile use cases include:

Investigating bugs while waiting for coffee: Codex can examine relevant files, reproduce issues in a browser, run tests, and propose fixes, with the developer responding or approving directly from the phone.

Making key decisions during a commute: Codex can start a long‑running refactor before arriving at the office, present alternative solutions, and let the developer choose the preferred path on the phone.

Preparing for fast‑paced client conversations: Codex can summarise the latest progress, flag pending issues, and draft a concise briefing that can be updated in real time.

Capturing inspiration on the go: Developers can create new threads or add ideas to existing work from lunch, a walk, or any moment of insight, ensuring the task begins before returning to the desk.

With the official release of remote SSH, Codex can directly connect to hosted remote environments, automatically detecting hosts from the SSH configuration and allowing project creation and thread execution as if the machine were local.

After a successful connection, the same secure relay infrastructure lets users access these authorized environments from any ChatGPT‑enabled device, enabling long‑running tasks to continue without being tied to a single computer.

OpenAI also announced upcoming enhancements: programmatic access tokens for CI pipelines and releases, universal Hooks for secret scanning, validators, logging, memory creation, and custom behaviour per repository, plus HIPAA‑compliant local usage of Codex for enterprise healthcare workflows.

The Codex functionality is currently in preview on iOS and Android for all subscription tiers, and a Windows mobile connection feature is slated for a later release.