Redesigning source control at Anthropic
The company says its internal code-change volume rose sharply and prompted a purpose-built version-control system.
TL;DR
- Anthropic said it averaged about 2,500 merged code changes a day in May 2026 and exceeded 30,000 a day by September.
- The company built Scion, an internal source-control system, as its codebase and review workflow scaled.
- The article describes Anthropic’s internal engineering choice; it does not establish that the system is suitable for other organizations.
Anthropic’s engineering post says the company redesigned its source-control workflow after its code-change volume grew. It reported about 2,500 merged changes a day in May 2026 and more than 30,000 daily by September. [1] [2]
The post describes Scion as an internal system built to handle the company’s codebase and review process. The design choice is presented by Anthropic itself, not an independent performance comparison. [1] [2]
A Hacker News discussion linked to the post and drew substantial engagement. The discussion confirms the article’s visibility among developers but does not independently verify Anthropic’s internal volume figures. [1] [2]
The company’s article does not publish a full benchmark against Git or establish how much of the increase came from AI-assisted changes. The scale of adoption and external applicability remain open. [1] [2]
Why it matters
The redesign shows how unusually high internal code throughput can push a large software organization to replace established tooling, while the claimed productivity and generality remain untested publicly.
Editor's note
The volume figures and system description come from Anthropic; Hacker News is a discussion source, not independent confirmation of internal metrics.