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How the Claude Code team does code review
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How the Claude Code team does code review

The gist

Anthropic's Claude Code team says Claude writes about 90 percent of the tool's own code.
The team reports merged pull requests more than doubled while reverts fell over 40 percent.

How it unfolded

  1. 2026 -05Changes landing per day in Anthropic's monorepo were about 2,500.
  2. 2026 -06 to 2026-09Merged pull requests to Claude Code's codebase more than doubled, while the share that had to be reverted fell by more than 40 percent.
  3. 2026 -09Changes landing per day in Anthropic's monorepo were more than 30,000.

Sources

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