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Ultrareview is a research preview feature. The feature, pricing, and availability may change based on feedback. The command is /code-review ultra. When ultrareview is available to your account, /ultrareview is an alias.
Ultrareview is a deep code review that runs on Claude Code on the web infrastructure. When you run /code-review ultra, Claude Code launches a fleet of reviewer agents in a remote sandbox to find bugs in your branch or pull request. Compared to a local /code-review, ultrareview offers:
  • Higher signal: every reported finding is independently reproduced and verified, so the results focus on real bugs rather than style suggestions
  • Broader coverage: a larger fleet of reviewer agents explores the change in parallel, which surfaces issues that a local review can miss
  • No local resource use: the review runs entirely in a remote sandbox, so your terminal stays free for other work while it runs
Ultrareview requires authentication with a claude.ai account because it runs on Claude Code on the web infrastructure. If you are signed in with an API key only, run /login and authenticate with claude.ai first. Ultrareview is not available when using Claude Code with Amazon Bedrock, Google Cloud’s Agent Platform, or Microsoft Foundry, and it is not available to organizations that have enabled Zero Data Retention. When ultrareview is not available, /code-review ultra runs a local review in your session instead.

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Run ultrareview from the CLI