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Ultrareview is a research preview feature available in Claude Code v2.1.86 and later. The feature, pricing, and availability may change based on feedback. The command is now invoked as /code-review ultra, and /ultrareview remains as 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 /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: many reviewer agents explore the change in parallel, which surfaces issues that a single-pass 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 Vertex AI, or Microsoft Foundry, and it is not available to organizations that have enabled Zero Data Retention.

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Run ultrareview from the CLI

Start a review from any git repository in the Claude Code CLI. 
/code-review ultra
Without arguments, ultrareview reviews the diff between your current branch and the default branch, including any uncommitted and staged changes in your working tree. Claude Code bundles the repository state and uploads it to a remote sandbox for the review. To review a GitHub pull request instead, pass the PR number. 
/code-review ultra 1234
In PR mode, the remote sandbox clones the pull request directly from the host rather than bundling your local working tree. PR mode works with repositories on github.com and on GitHub Enterprise Server instances that an admin has connected to Claude Code.
If your repository is too large to bundle, Claude Code prompts you to use PR mode instead. Push your branch and open a draft PR, then run /code-review ultra <PR-number>.
Before launching, Claude Code shows a confirmation dialog with the review scope (including the file and line count when reviewing a branch), your remaining free runs, and the estimated cost. After you confirm, the review continues in the background and you can keep using your session. The command runs only when you invoke it with /code-review ultra; Claude does not start an ultrareview on its own.

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Pricing and free runs

Ultrareview is a premium feature that bills against usage credits rather than your plan’s included usage.
PlanIncluded free runsAfter free runs
Pro3 free runsbilled as usage credits
Max3 free runsbilled as usage credits
Team and Enterprisenonebilled as usage credits
Pro and Max subscribers receive three free ultrareview runs to try the feature. These three runs are a one-time allotment per account and do not refresh. After you use all three, or after the free run period ends, each review is billed to usage credits and typically costs $5 to $20 depending on the size of the change. A run counts once the remote session starts, so a review that you stop early or that fails to complete still uses a free run. For a paid review, usage credits are billed only for the portion that ran. Because ultrareview always bills as usage credits outside the free runs, your account or organization must have usage credits turned on before you can launch a paid review. If usage credits are not turned on, Claude Code blocks the launch and links you to the billing settings where you can turn them on. You can also run /usage-credits to check or change your current setting.

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Track a running review

A review typically takes 5 to 10 minutes. The review runs as a background task, so you can keep working in your session, start other commands, or close the terminal entirely. Use /tasks to see running and completed reviews, open the detail view for a review, or stop a review that is in progress. Stopping a review archives the cloud session, and partial findings are not returned. When the review finishes, the verified findings appear as a notification in your session. Each finding includes the file location and an explanation of the issue so you can ask Claude to fix it directly.

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Run ultrareview non-interactively

Use the claude ultrareview subcommand to start an ultrareview from CI or a script without an interactive session. The subcommand launches the same review as /code-review ultra, blocks until the remote review finishes, prints the findings to stdout, and exits with code 0 on success or 1 on failure. 
claude ultrareview
claude ultrareview 1234
claude ultrareview origin/main
Without arguments, the subcommand reviews the diff between your current branch and the default branch. Pass a PR number to review a pull request, or pass a base branch to review the diff against that branch instead. Invoking the subcommand counts as consent for the billing and terms prompt that the interactive command shows. Progress messages and the live session URL go to stderr so stdout stays parseable. Use these flags to control the output and timeout:
FlagDescription
--jsonPrint the raw bugs.json payload instead of the formatted findings
--timeout <minutes>Maximum minutes to wait for the review to finish. Defaults to 30
Running claude ultrareview requires the same authentication and usage credit configuration as /code-review ultra. The subcommand exits with code 0 when the review completes with or without findings, code 1 when the review fails to launch, the remote session errors, or the timeout elapses, and code 130 when interrupted with Ctrl-C. The remote review keeps running if you interrupt the subcommand; follow the session URL printed to stderr to watch it in the browser. For automatic reviews on GitHub pull requests, Code Review integrates with your repository directly and posts findings as inline PR comments without a CLI step.

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How ultrareview compares to /review

Both commands review code, but they target different stages of your workflow.
/review/code-review ultra
Runslocally in your sessionremotely in a cloud sandbox
Depthsingle-pass reviewmulti-agent fleet with independent verification
Durationseconds to a few minutesroughly 5 to 10 minutes
Costcounts toward normal usagefree runs, then roughly $5 to $20 per review as usage credits
Best forquick feedback while iteratingpre-merge confidence on substantial changes
Use /review for fast feedback as you work. Use /code-review ultra before merging a substantial change when you want a deeper pass that catches issues a single review might miss.