OpenAI Codex

• https://github.com/openai/codex
• https://developers.openai.com/codex
• Uses the models GPT-5.4 or Codex (old versions)

brew install --cask codex
code # cli
code-app # gui

Config

• Everything is stored at ~/.codex/ (global) and ./.codex/ (project)
• ~/.codex/config.toml: main config file

Billing

• You can run Codex with your ChatGPT subscription: Free, Go, Plus, Pro, Business, Edu, or Enterprise plan
• ... or use with API credits by signing in with an OpenAI API key.