Codex

Codex CLI is a locally‑run coding agent provided by OpenAI that operates from the terminal. After installing globally via npm or Homebrew, users invoke the `codex` command to interact with the agent, which authenticates through a ChatGPT account or an API key. The tool supports macOS (Apple Silicon and Intel) and Linux binaries, and the repository includes documentation for installation, usage, and contribution.

The agent is intended for developers who want AI‑assisted coding directly in their command‑line environment, with the option to connect to the same OpenAI models used in ChatGPT Plus, Pro, Business, Edu, or Enterprise plans. It can also be integrated into IDEs such as VS Code, Cursor, and Windsurf, or run as a desktop application via `codex app`.

Distinctive aspects include its terminal‑first interface, cross‑platform binary distribution, and the ability to leverage existing ChatGPT subscription tiers without requiring a separate cloud service. The project is released under the Apache‑2.0 license.