ScriptsMar 29, 2026·1 min read

OpenAI Codex CLI

OpenAI's official coding agent CLI. Supports Agent Skills, custom prompts, and IDE integration. The open-source alternative to ChatGPT for code.

TO
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Quick Use

Use it first, then decide how deep to go

This block should tell both the user and the agent what to copy, install, and apply first.

npm install -g @openai/codex
codex

Or use without installing:

npx @openai/codex
Intro

OpenAI's open-source coding agent CLI — a lightweight Rust-based tool that brings GPT-5 to your terminal for code generation, debugging, and refactoring. Supports the Agent Skills standard (compatible with Claude Code and Gemini CLI), custom markdown slash commands, and IDE extensions for VS Code, Cursor, and Windsurf. 68,200+ GitHub stars.

Key Features

  • Lightweight Rust CLI — Fast startup, minimal resource usage
  • Agent Skills support — Same SKILL.md format as Claude Code and Gemini CLI
  • Custom slash commands — Turn markdown files into reusable commands
  • IDE integration — VS Code, Cursor, Windsurf extensions
  • Multi-model — GPT-5.2, GPT-5.1, GPT-5, o3, o4-mini

Custom Prompts

Create .codex/prompts/my-command.md to add custom slash commands:

---
name: review
description: Review code for bugs and improvements
---
Review the selected code for potential bugs, security issues, and improvements.
Focus on correctness, performance, and readability.

Skills

Codex supports the same Agent Skills format as Claude Code:

.codex/skills/my-skill/SKILL.md

Skills auto-activate based on context. Cross-compatible with Claude Code and Gemini CLI via agentskills.io.

Source & Thanks

Author: OpenAI Repository: codex — ⭐ 68,200+ License: Apache 2.0 Docs: developers.openai.com/codex

Related Assets

Agent Skills Standard — Cross-Platform AI Skills

The shared Agent Skills format used by Claude Code, OpenAI Codex, and Gemini CLI. Write skills once, use across all major AI coding tools.

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OpenAI Codex & Cookbook Official Collection

Official OpenAI resources: Codex CLI coding agent and the OpenAI Cookbook with prompting guides for GPT-5.2, Codex, and more.

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OpenAI Cookbook — Official Prompting Guides

Official prompting guides from OpenAI: GPT-5.2, Codex, Meta Prompting, and Realtime API guides. The definitive reference for OpenAI model optimization.

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