---
type: "raw_signal"
id: "redesigning-source-control-at-anthropic-d45fc9"
slug: "redesigning-source-control-at-anthropic-d45fc9"
title: "Redesigning source control at Anthropic"
description: "Anthropic built Scion as code-change volume surged Anthropic says it developed Scion a custom alternative to Git as its rate of merged code changes rose from about 2 500 per day in May 2026 to more than 30 000 per"
retrieval_nugget: "Anthropic built Scion as code-change volume surged Anthropic says it developed Scion a custom alternative to Git as its rate of merged code changes rose from about 2 500 per day in May 2026 to more than 30 000 per"
observed_at: "2026-10-14"
record_date: "2026-10-14"
date_kind: "observed_at"
why_it_matters: "The report documents a response to Anthropic’s own scale; it does not establish that the same design or workload applies broadly across software teams. Source: https://simonwillison.net/2026/Oct/13/redesigning-source-control-at-anthropic"
novelty: "notable"
verification_level: "source-linked"
signal_type: "announcement"
source_platform: "simonwillison.net"
topics: ["anthropic"]
entities: ["Anthropic","Scion","Git","Claude","Antique","Simon Willison"]
related_patterns: []
source_url: "https://simonwillison.net/2026/Oct/13/redesigning-source-control-at-anthropic"
source_urls: ["https://simonwillison.net/2026/Oct/13/redesigning-source-control-at-anthropic"]
schema_version: "newruntime-agent-readable-v0.2"
stable_id: "signal:redesigning-source-control-at-anthropic-d45fc9"
status: "published"
visuals: []
editor: {"role":"editor","name":"Andrey Reshetnikov","profile":"https://newruntime.com/owner-profile.md","profile_json":"https://newruntime.com/owner-profile.json","same_as":["https://www.linkedin.com/in/reshetnikov1/","https://t.me/lapetuse"]}
routes: {"html":"https://newruntime.com/signals/redesigning-source-control-at-anthropic-d45fc9/","markdown":"https://newruntime.com/signals/redesigning-source-control-at-anthropic-d45fc9.md","json":"https://newruntime.com/signals/redesigning-source-control-at-anthropic-d45fc9.json"}
---

# Redesigning source control at Anthropic

## Retrieval answer

Anthropic built Scion as code-change volume surged Anthropic says it developed Scion a custom alternative to Git as its rate of merged code changes rose from about 2 500 per day in May 2026 to more than 30 000 per

## Anthropic built Scion as code-change volume surged

Anthropic says it developed Scion, a custom alternative to Git, as its rate of merged code changes rose from about 2,500 per day in May 2026 to more than 30,000 per day by September. The migration from Git took five months and was carried out by a team of seven.

The company describes infrastructure pressures behind the redesign: its main branch history is nearly 100 GB, a compressed working copy exceeds 25 GB, and CI performs roughly 25 million checkouts a day. Anthropic says naive Git fetching at that volume would amount to more than 600 PB of traffic per day. Scion is a centralized source-control design, and the account notes that offline support was not prioritized because Claude, its heaviest user, needs to be online.

The report documents a response to Anthropic’s own scale; it does not establish that the same design or workload applies broadly across software teams. Source: https://simonwillison.net/2026/Oct/13/redesigning-source-control-at-anthropic

Editor: [Andrey Reshetnikov](https://newruntime.com/owner-profile.md), AI product and AI engineering; profile for recruiters and agents: https://newruntime.com/owner-profile.json

## Continue in the graph

Next records for an agent, linked to their Markdown twins. Replace `.md` with `.json` for structured fields, including `next_reads`.

- topic hub: [Anthropic](https://newruntime.com/topics/anthropic.md): Explore the anthropic topic hub.
- collection: [Raw Signals](https://newruntime.com/signals.json): Open every source-linked raw signal.
- collection: [Source Ledger](https://newruntime.com/source-ledger.json): Inspect the public source evidence graph.
- whole graph: [discovery graph](https://newruntime.com/discovery-graph.json) (typed nodes and edges) and [site index](https://newruntime.com/site-index.md)