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Anthropic built its own git replacement for AI-scale coding. But you can’t have it.

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Anthropic built its own git replacement for AI-scale coding. But you can’t have it.

This week, Anthropic revealed it built an in-house version control system to handle exploding code merges. It says Claude was both part of the problem that caused the bottleneck and instrumental in building the solution. 

When the AI company’s daily code merges hit more than 30,000 in September 2026 (up from just 2,500 in May), it realized this trend was likely to continue, and it needed an alternative to the git-based system that was beginning to falter: “Every bottleneck we remove immediately leads to a further increase in the amount of code we produce.”

Dubbed Scion, its in-house version control system has a 200x smaller infrastructure footprint in CPU and memory than its previous git-mirroring infrastructure, per Anthropic. Plus, it says CI and research jobs can now check out code two orders of magnitude faster.

That’s great news for Anthropic — but just a tease for everyone else. Even though Anthropic expects other companies to hit similar bottlenecks, it has no plans to release Scion or create a public version any time soon. For developers dealing with similar scaling issues, inspiration from Anthropic is all they’ve got for now — though it says it wants to partner with GitHub, GitLab and the open source community to bring some of Scion’s ideas to git.

Scion is Anthropic’s in-house version control system, which it says it built and fully migrated its monorepo to in just five months. 

The project started around the same time Anthropic made Claude Mythos Preview and Claude Tag available internally.


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