Codex CLI

Codex CLI is an open-source coding agent from OpenAI that runs locally on your computer. You install it with npm, Homebrew or a standalone installer, then run codex in a project to have it read, change and run code. It signs in with a ChatGPT plan or works with an API key.

Codex CLI runs commands inside a sandbox with approval settings, so you decide what it may touch. It follows project instructions from AGENTS.md files, supports skills and slash commands, and has a non-interactive mode (codex exec) for scripts and CI. The same agent is available as an extension for VS Code, Cursor and Windsurf, and as a desktop app.

Codex CLI is the open-source client behind one of the most widely used coding agents. The code is Apache-licensed and built in Rust, so you can see exactly what runs on your machine, and other projects such as Open Interpreter build on it.

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openai/codex

• Claude CodeAnthropic's coding agent for the terminal, sold with a Claude subscription.
• CursorAI code editor built on VS Code, sold as a subscription.
• GitHub CopilotGitHub's AI coding assistant, sold as a subscription.
• OpenCodeNo. 078Open-source AI coding agent for the terminal that works with many model providers.

See every open-source alternative to Claude Code in the collection.