published jan 16, 2026

Code From Your Phone with Openai’s Codex

intermediate

The Rundown

This guide teaches you how to set up OpenAI Codex in Cursor, run Codex in the cloud from your phone, and configure Codex to review your code automatically. You’ll produce a Codex-ready project setup and a workflow for local coding, cloud tasks, and pull request reviews.

Who This Is Useful For

  • Developers who want AI coding help but find terminal-based tools intimidating.
  • ChatGPT Plus or Pro subscribers who have not tried Codex yet.
  • Anyone curious about AI coding agents.

What You Will Build

You’ll install Codex, connect it to a project, and create an AGENTS.md file that tells Codex about your project. You’ll also explore slash commands and set up automated code reviews.

  • A Codex IDE setup in Cursor or another supported editor.
  • An AGENTS.md project configuration file.
  • A cloud Codex workflow connected to GitHub.
  • Automatic Codex reviews for new pull requests.

What You Need

  • A ChatGPT Plus account.
  • Cursor or another supported code editor, such as VS Code or Windsurf.
  • A GitHub account, optional for cloud workflows and pull requests.
  • An existing project, or a PRD or spec sheet if you are starting from scratch.

Going Further

  • After setup, you can run Codex tasks from chatgpt.com/codex, create pull requests from Codex’s work, customize project-specific virtual environments, and use cloud-based Codex calls to preserve your 5-hour local limit.
Cloud-based Codex calls from the web or other connectors do not count against your 5-hour local limit, so you can code locally in Cursor and use the cloud agent for pull requests and reviews.