Codex Code Review vs Claude Code: AI Code Review Comparison

Updated March 11, 2026 Two days ago, Anthropic launched a dedicated multi-agent Code Review feature for Claude Code. The timing makes this comparison unusually concrete: you now have two mature, production-grade AI code review tools with meaningfully different architectures, pricing models, and failure modes. This article breaks down what each tool actually does, where each one falls short, and which one fits your team. Both tools position themselves as AI pair programming assistants that extend into review — but their review architectures diverge sharply. The Core Architectural Divide Codex takes a workflow-embedded, conversational approach. Trigger a review via @codex review in a GitHub PR comment, or configure automatic review on push using the openai/codex-action@v1 GitHub Action. Codex navigates the codebase, runs tests, and surfaces findings inline. It's designed to feel like a fast, always-available teammate inside your existing GitHub workflow. Claude Code Review (launched Marc