Claude Merged 30,401 Changes in One Day. Git Couldn't Keep Up.
An agent gets a task - fix a flaky test. Before it reads a single line of code, it needs a working copy of the repository.
Under git, that meant waiting 7.1 minutes.
Multiply that wait by tens of thousands of agents a day and you get the problem Anthropic described in its engineering post on 13 October 2026. The code wasn't the slow part any more. Claude could write the fix in seconds; the plumbing built for human engineers (source control, builds, CI) couldn't hand it the repo fast enough.
So Anthropic threw out git for its main repository and built Scion.
January: about 1,000 merges a day
The numbers tell the story better than I can. In January 2026, Anthropic merged roughly 1,000 code changes a day. By May it was about 2,500.
The team tried everything git offers to cope: shallow clones, sparse checkouts, promisor remotes, repository...
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