OpenAI Codex Now Available in ChatGPT Mobile App for All Users

OpenAI announced that Codex is now previewed on the Android and iOS versions of the ChatGPT app, and the feature is open to every user, including those on the free tier.

The update emphasizes a higher synchronization rate, allowing developers to approve code and assign tasks to the AI at any time and from any location, which the development community greeted as a transformative change.

More than 4 million users are already using Codex weekly, and the growing reliance on AI agents for longer‑running, complex tasks has driven the emergence of this mobile collaboration mode.

Within the ChatGPT mobile app, Codex shows real‑time execution status, recent discoveries, direction changes, approval steps, and lets users add new ideas. It can also operate on a laptop, Mac Mini, devbox, or any remote environment.

When a device running Codex is connected, the app loads the environment’s live state, enabling smooth handling of activity threads, approvals, plugins, and project context across devices.

Typical mobile scenarios include:

Investigating bugs while waiting for coffee: Codex runs checks, reproduces issues in the browser, executes tests, and proposes fixes; the user can approve or clarify directly from the phone.

Making key decisions during a commute: Codex starts a long‑running refactor, presents two viable solutions, and the user selects one on the phone, so the project progresses before reaching the office.

Preparing for fast‑paced client calls: After a meeting, Codex aggregates the latest progress, flags pending issues, and drafts a concise briefing that can be updated with new information before the call.

Capturing inspiration on the go: Users can create a new thread or add to an existing one from lunch or a walk, sending ideas to the AI so work begins before returning to the desk.

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

With the official remote‑SSH release, Codex can directly connect to hosted remote environments that already contain approved dependencies, credentials, security policies, and compute resources. The desktop client automatically detects SSH hosts and lets users create projects and run threads on remote machines as if they were local.

Future updates will add programmatic access tokens for scoped credentials usable in CI pipelines, universal Hooks for secret scanning, validation, logging, memory, and repository‑specific behavior, and HIPAA‑compliant local usage for medical institutions.

Codex mobile preview is live on iOS and Android for all subscription plans and regions; Windows mobile connectivity will be released later. Users need to update the ChatGPT mobile app and the macOS Codex app to access the new features.