OpenAI released a plugin that runs Codex inside Claude Code, letting you use both tools at once. The /codex-adversarial-review command has Codex critique Claude's code for inefficiencies and bugs. You need active accounts on both platforms and can find setup instructions on GitHub.
OpenAI built an official plugin that lets you use Codex right inside Claude Code. And that's not even the best part, because it's /commands, and you got both of them working in the same terminal. Oh, and that's still not the best part, because the best part is /codex-adversarial-review, where Codex argues against the way Claude built it. So it comes back and says the thing works, but you built it the expensive way, and here's what breaks later. Just know it runs on your Codex limits, so you'll need an account on both sides. So if you want to try this yourself, go to this GitHub repo and ask Claude to install it and set it up.
