Anthropic Rushes to Limit the Leak of Claude Code Source Code
Corroborated by 9 sources from 9 publishers
TL;DR
Reports differ across sources; according to arstechnica.com, the entire source code for Anthropic’s Claude Code command line interface application (not the models themselves) has been leaked and disseminated, apparently due to a serious internal error.
Sources
1
VentureBeat
https://venturebeat.com/technology/claude-codes-source-code-appears-to-have-leaked-heres-what-we-know
2
Fortune
https://fortune.com/2026/03/31/anthropic-source-code-claude-code-data-leak-second-security-lapse-days-after-accidentally-revealing-mythos
3
Fortune
https://fortune.com/2026/03/31/ai-mirages-alien-machine-brains-anthropic-leaks
4
Ars Technica
https://arstechnica.com/ai/2026/03/entire-claude-code-cli-source-code-leaks-thanks-to-exposed-map-file
5
CNBC Top News
https://www.cnbc.com/2026/03/31/anthropic-leak-claude-code-internal-source.html
6
The Verge (Tech)
https://www.theverge.com/ai-artificial-intelligence/904776/anthropic-claude-source-code-leak
7
TechCrunch
https://techcrunch.com/2026/03/31/anthropic-is-having-a-month
8
Bloomberg Technology
https://www.bloomberg.com/news/articles/2026-04-01/anthropic-accidentally-releases-source-code-for-claude-ai-agent
9
Engadget
https://www.engadget.com/ai/claude-code-leak-suggests-anthropic-is-working-on-a-proactive-mode-for-its-coding-tool-150107049.html?src=rss
10
Bloomberg Technology
https://www.bloomberg.com/news/articles/2026-04-01/anthropic-scrambles-to-address-leak-of-claude-code-source-code
11
The Guardian (World)
https://www.theguardian.com/technology/2026/apr/01/anthropic-claudes-code-leaks-ai