Over 4 million developers now use OpenAI's Codex AI coding assistant weekly, and the company has brought the tool to mobile phones through the ChatGPT app.

The mobile preview lets developers stay connected to active coding work running on their laptops, development boxes, or remote environments. Users can review code changes, approve commands, and guide AI work from anywhere.

Codex mobile provides full access to live development environments through a secure relay system. The app syncs screenshots, terminal output, code diffs, and test results in real-time without exposing local machines to the public internet.

Enterprise features expand access

OpenAI also released Remote SSH for enterprise teams developing in managed cloud environments. The feature connects Codex directly to approved remote machines with existing security policies and credentials.

New enterprise tools include programmatic access tokens for CI pipelines, generally available Hooks for customizing Codex behavior, and HIPAA-compliant support for healthcare organizations using local environments.

The mobile app supports common developer workflows like investigating bugs during commutes, making architectural decisions remotely, and turning ideas into code while away from desks.

"As agents take on longer-running work, a new rhythm for collaboration is emerging," OpenAI said. "You need to be able to easily answer a question, review what Codex found, change direction, approve what comes next, or add a new idea."

The company positions mobile access as essential for maintaining momentum on multi-hour coding tasks that require periodic human guidance and approval.

Codex mobile preview launches on iOS and Android across all ChatGPT plans including free tiers. Windows support for the desktop Codex app connection arrives later. Enterprise features like programmatic tokens require Business or Enterprise subscriptions.