Codex Plugin for Claude Code Review 2026: Two Models, One Workflow

If you live in Claude Code but occasionally want a second opinion from OpenAI’s Codex, you used to switch tabs, copy context, and lose your place. The Codex plugin for Claude Code removes that friction: it brings Codex directly into the workflow you already use.

What is the Codex plugin for Claude Code?

It’s an OpenAI plugin that adds Codex commands to Claude Code. You can run a read-only or adversarial code review, delegate background tasks to Codex, and manage those jobs — all from within Claude Code.

Key features

• /codex:review for a normal, read-only Codex review
• /codex:adversarial-review for a steerable challenge review
• Delegate tasks with /codex:rescue, /codex:transfer, /code:status, /codex:result, and /codex:cancel
• Manage background Codex jobs inside Claude Code
• Marketplace install — add it from the Claude Code plugin marketplace in seconds

Why it’s useful

A second model is a genuine check on the first. Asking Codex to challenge a design or review a diff often surfaces issues Claude missed, and vice versa. Delegating grunt work to Codex keeps your Claude session focused on direction.

Pros and cons

Pros: easy install, second-model review, background task delegation, no context-switching.

Cons: requires a ChatGPT/OpenAI account or API key; adds Codex API cost on top of your Claude usage; the two-agent setup can confuse newcomers at first.

Pricing

Free and open source. Codex usage is billed per OpenAI’s Codex pricing.

FAQ

Do I need a paid ChatGPT plan? A Free tier works, but heavier use draws on Codex usage limits; an API key also works.

Does it replace Claude Code? No — it adds Codex as a satellite tool inside your Claude Code session.