OpenAI Codex Now Available in ChatGPT Mobile App for All Users

OpenAI announced that Codex, its AI‑powered coding assistant, is now integrated into the ChatGPT mobile application for both Android and iOS. The preview is open to all users, including those on the free tier, and focuses on improving synchronization so developers can approve code and manage tasks from anywhere.

The update highlights that more than four million users run Codex each week, and the new mobile collaboration mode enables developers to monitor runtime status, view discoveries, approve subsequent steps, or add new ideas directly from their phones. Codex continues to run on the developer’s laptop, MacMini, devbox, or remote environment.

OpenAI explains that Codex operates behind a secure relay layer, which guarantees that trusted machines can be accessed without exposing them to the public internet and keeps session state and context synchronized across all devices logged into ChatGPT.

Typical mobile workflows illustrated in the article include:

Investigating bugs while waiting for coffee : Codex runs in the developer’s environment, reproduces issues, executes tests, and proposes fixes. The developer can approve or clarify actions from the phone and review screenshots, terminal output, and diffs before returning to the computer.

Making a critical decision during a commute : A long‑running refactor is started before arriving at the office; Codex presents two viable solutions, and the developer can weigh the trade‑offs on the phone, allowing the project to progress automatically.

Preparing for fast‑paced client conversations : After a meeting, Codex aggregates the latest progress from Slack, email, and documentation, flags pending issues, and generates a concise briefing that can be updated in real time.

Capturing inspiration on the go : Whether during lunch or a walk, the developer can create a new thread or add to an existing one, sending ideas to Codex for immediate processing so work can begin before returning to the desk.

With the official release of remote‑SSH, Codex can directly connect to hosted remote development environments. The desktop client automatically detects hosts defined in the SSH configuration, allowing projects and threads to be created on remote machines as if they were local.

After a successful connection, the same secure‑relay infrastructure lets authorized ChatGPT devices access those environments, enabling long‑running tasks to continue across devices without being tied to a single workstation.

OpenAI also outlined upcoming enhancements: programmatic access tokens for CI pipelines and release workflows, universally available hooks for secret scanning, validators, logging, memory creation, and custom behavior per repository, and HIPAA‑compliant usage of Codex in medical settings.

Codex in the ChatGPT mobile app is currently in preview on iOS and Android for all subscription plans, including the free tier, and is available in all supported regions. Users need to update the ChatGPT mobile app and the macOS Codex app to enable the feature. A Windows mobile connection is promised for a later release.