Anthropic reports its daily merged code changes grew from roughly 2,500 in May 2026 to over 30,000 by September, driven by Claude's autonomous coding. To handle this scale, the company built Scion, an in-house version control system, and migrated its monorepo from git in five months. The announcement, covering Scion's design principles and related tools like the Antique code review surface, also details the scale challenges that prompted the move.
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