OpenAI brings Codex to your phone — and it's free to try
OpenAI opened mobile access to Codex, its AI coding agent, on May 14 — and it's available on every ChatGPT plan, including the free tier. More than 4 million developers already use Codex every week, per TechCrunch, and that number has quintupled in the past three months. For anyone who writes code, this puts a powerful AI assistant in your pocket at no extra cost.
How it actually works
Codex doesn't run on your phone. The ChatGPT app on iOS or Android acts as a remote control for a Codex environment that lives on a Mac, laptop, or company server. Your files, credentials, and permissions stay on the host machine — nothing sensitive moves to your handset. The phone receives task-progress updates, test results, and screenshots, and you can send new instructions from wherever you are.
OpenAI uses a secure session-relay layer to keep everything in sync across devices where you're signed into ChatGPT. Mac connectivity is live now; Windows support is listed as coming soon, according to 9to5Mac.
The competitive angle
The free-tier access is a direct shot at Anthropic's Claude Code, which sits behind a paid subscription. Indie developers and small teams evaluating AI coding tools now have a zero-cost entry point with Codex, which lowers the stakes for trying it out.
OpenAI also confirmed it is working on a unified desktop app that would bring ChatGPT, Codex, and the Atlas browser together in one place — a move that looks more like platform consolidation than a single product update.
Plans and pricing
Mobile Codex is included in all ChatGPT tiers: Free, Go, Plus ($20/mo), Pro, Business, and Enterprise. Token-based billing for heavier Codex usage kicked in on April 2, 2026, meaning power users on higher plans pay based on how much they actually use rather than a flat cap. Usage limits reset every five hours on most plans.
The preview rolls out now on iOS and Android. Update the ChatGPT app and make sure the Codex app is installed on your Mac to get started.