OpenAI just shipped a plugin for its competitor’s product. openai/codex-plugin-cc is an official Claude Code plugin that lets you call Codex — OpenAI’s coding agent — inside Anthropic’s terminal tool. 22,700+ GitHub stars, +352 today, still climbing on Trending.
What it actually does
Claude writes the code, Codex checks it. /codex:review runs a standard review, /codex:adversarial-review attacks your design decisions, /codex:rescue hands a stuck task to Codex entirely, and /codex:transfer moves your whole Claude session into a persistent Codex thread. Background jobs (/codex:status, /codex:result) let Codex grind on a bug while Claude keeps building.
Getting in
One command: /plugin install codex@openai-codex from Claude Code’s plugin marketplace, then /codex:setup. Under the hood it wraps the local Codex CLI and calls the Codex API — a ChatGPT subscription (free tier counts) or an OpenAI API key is enough. The typical use case: two frontier coding agents cross-checking each other’s work in one session.
Why it matters
Six months ago OpenAI and Anthropic were fighting for the same terminal. Now OpenAI would rather be a layer inside Claude Code than absent from it. Interoperability just beat rivalry — that’s the real story, not the plugin.
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