Codex Plugin for Claude Code — OpenAI Cross-Review

What it is

The Codex Plugin for Claude Code is an official OpenAI integration that brings Codex code review and task delegation capabilities directly into the Claude Code environment. It enables adversarial code reviews where a second AI model examines code from a different perspective, rescue debugging when one model gets stuck, and multi-model collaboration workflows.

Developers using Claude Code who want a second opinion from OpenAI's Codex model benefit most. The cross-review pattern catches bugs and blind spots that a single model might miss, similar to how human pair programming works.

How it saves time or tokens

Instead of manually copying code between Claude Code and an OpenAI interface, the plugin routes review requests directly. Adversarial review catches issues early in the development cycle, reducing debugging time later. When Claude Code gets stuck on a problem, delegating to Codex provides a fresh approach without starting over. The token cost of a targeted review is typically lower than multiple rounds of iterative debugging with a single model.

How to use

1. Install the Codex plugin in your Claude Code configuration:

{
  'plugins': {
    'codex': {
      'enabled': true,
      'api_key': 'your-openai-api-key'
    }
  }
}

1. Request an adversarial review of your current code:

/codex review src/auth/jwt.ts

1. Delegate a stuck debugging task:

/codex debug 'Why does this WebSocket handler leak memory under load?'

Example

# Cross-review a pull request with both models
/codex review --adversarial src/api/routes.ts

# Delegate a specific implementation task
/codex implement 'Add rate limiting middleware using sliding window algorithm'

# Get a second opinion on architecture decisions
/codex review --focus architecture src/

The plugin returns Codex's analysis alongside Claude's own assessment, highlighting areas of agreement and disagreement.

Related on TokRepo

• AI Coding Tools -- Browse coding agents and developer utilities
• Claude Skill: Code Reviewer -- Built-in Claude Code review agent

Common pitfalls

• The plugin requires a valid OpenAI API key with Codex access. API costs apply separately from your Anthropic billing.
• Adversarial reviews work best on focused code segments (single files or functions). Reviewing entire repositories produces noisy output.
• Multi-model outputs can sometimes contradict each other. Treat disagreements as signals for closer human inspection, not as definitive answers.