OpenAI Codex Now Available in the ChatGPT Mobile App for All Users

On Friday OpenAI announced that Codex is now integrated into the ChatGPT mobile application, with preview releases for Android and iOS that are open to all users, including the free tier.

The update emphasizes higher synchronization rates, allowing developers to approve code, assign tasks, and monitor progress from anywhere. The community responded enthusiastically, calling it a transformative change.

Codex runs in the developer’s own environment, so the phone can inspect files, reproduce bugs in a browser, run tests, and start fixes. When clarification or permission is needed, the user can reply or approve directly on the phone, viewing screenshots, terminal output, and test results before returning to the computer.

Typical mobile workflows include:

Investigating bugs while waiting for coffee: Codex checks relevant files, reproduces the issue, runs tests, and begins fixing; the user can approve actions from the phone.

Making a critical decision during a commute: Codex proposes two viable refactoring solutions; the user evaluates them on the phone and the chosen path continues automatically.

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

Capturing inspiration on the go: Users can start a new thread or add ideas to an existing task from the phone, ensuring work begins before returning to the desk.

Under the hood, Codex uses a secure relay layer that guarantees trusted machines can be accessed without exposing them directly to the public internet, while preserving session state and context across all devices logged into ChatGPT.

With remote SSH now generally available, Codex can connect directly to hosted development environments. The desktop client automatically detects SSH hosts and lets users create projects and run threads 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 without being tied to a single workstation.

OpenAI also announced upcoming updates to expand large‑scale automation, customization, and management of Codex, including:

Programmatic access tokens with scoped credentials that can be issued from the ChatGPT workspace for CI pipelines and internal automation.

Globally available Hooks for scanning prompts for secrets, running validators, logging conversations, creating memories, or customizing Codex behavior for specific repositories and directories.

HIPAA‑compliant local usage of Codex in CLI, IDE, or app environments for ChatGPT Enterprise workspaces, helping medical institutions accelerate patient care workflows.

Codex on the ChatGPT mobile app is now in preview on both iOS and Android for all subscription tiers, and a Windows‑to‑mobile connection feature will be released later.