OpenAI released a plugin that embeds its AI coding assistant Codex directly into Anthropic's Claude Code.
The plugin offers three core features: a standard code review, a more aggressive "adversarial review" that specifically challenges weaknesses and design decisions, and the ability to hand off tasks to Codex in the background. It requires a ChatGPT subscription (including the free tier) or an OpenAI API key, plus Node.js version 18.18 or higher.
The plugin doesn't install a separate program. Instead, it uses the Codex installation already on the machine, with the same settings and credentials. Users can also enable a "Review Gate" that prevents Claude Code from finalizing changes until Codex has reviewed them.
Meeting developers where they already work
Strategically, the plugin is a pragmatic move. Claude Code dominates the market right now. Rather than waiting for developers to switch to Codex, OpenAI is bringing its Codex model directly into their existing workflow. Every review triggered through the plugin runs on OpenAI's infrastructure and generates usage.
