Two AI agents. One workflow. No switching tabs.

This guide covers how to set up the Codex plugin inside Claude Code, what each command actually does, and the workflow patterns worth using. Everything here is pulled from the official release by Vaibhav (VB) Srivastav at OpenAI.

Why this exists

The Claude Code vs Codex debate has been loud.

This plugin makes it irrelevant.

You can now run Codex reviews, adversarial challenges, and full task handoffs without ever leaving Claude Code. Same local auth, same config, same MCP setup. Codex just gets invoked from inside.

One workflow. Two agents. Better output than either alone.

What you need before setup

• Claude Code installed and running
• A ChatGPT subscription (Free works) OR an OpenAI API key
• Node.js 18.18 or later

Setup (takes 2 minutes)

Step 1: Add and install the plugin

/plugin marketplace add openai/codex-plugin-cc
/plugin install codex@openai-codex
/codex:setup

Step 2: Install Codex globally if you haven't already

npm install -g @openai/codex