Science & Tech · AI · 3 hrs ago
Anthropic builds Scion to manage a surge in AI-generated code
Anthropic says its merged code changes rose from about 2,500 a day in May to more than 30,000 in September as Claude produced more code.
The increase strained the systems the company uses to store, review and test software.
Anthropic built Scion, a centralized source-control system, after several months of development and a five-month migration.
The system is designed for large codebases and AI agents, with many operations handled by a server rather than by local copies of a repository.
Anthropic says its main code branch is about 100 GB and its continuous-integration system runs roughly 25 million code checkouts each day.
The scale made Git-based workflows difficult for Anthropic, although the company says Git remains suitable for most code repositories.
Anthropic also developed tools for code review, search and access control alongside Scion.
Anthropic developed Scion, a version control system designed to manage the surge in code produced by its Claude models.
The company said it merged more than 30,000 code changes per day in September, up from about 2,500 per day in May 2026.
Scion uses a centralized design, with source control queries handled through a server rather than relying on local repositories.
Anthropic said its main branch is about 100 GB and that it performs around 25 million code checkouts each day for continuous integration.
The company also used Claude to help build other coding infrastructure tools, including a code review interface and a code search tool.
- Who
- Anthropic, the company behind Claude.
- What
- It built Scion, a source control system intended to manage code at scale.
- When
- Work on Scion started in January; Anthropic reported its code-change figures for May and September 2026.
- Where
- Not stated.
- Why
- Anthropic said its existing coding infrastructure could not keep up with the volume of code being produced.
This story does not have two clearly opposing sides.
Work on Scion started.
Anthropic averaged around 2,500 code changes merged per day.
Anthropic merged more than 30,000 code changes per day.
- System
- Scion
- Code changes merged per day in May 2026
- Around 2,500
- Code changes merged per day in September 2026
- More than 30,000
- Main branch size
- About 100 GB
- Daily code checkouts for CI
- Around 25 million
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What people are saying
In May 2026, Anthropic averaged around 2,500 code changes merged per day; as of September, we merged over 30,000 per day
We don’t expect this rate of growth to slow down anytime soon; the latent demand for merging code is practically infinite, and every bottleneck we remove immediately leads to a further increase in the amount of code we produce.
We perform on the order of 25 million code checkouts per day for CI, before counting developer environments, agent sandboxes, and research jobs