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Fortune
Fortune
Beatrice Nolan

Anthropic leaks its own AI coding tool’s source code in second major security breach

Anthropic Fortune Opus Claude Code
(Credit: Chesnot—Getty Images)

Anthropic has accidentally leaked the source code for its popular coding tool Claude Code. 

The leak comes just days after Fortune reported that the company had inadvertently made close to 3,000 files publicly available, including a draft blog post that detailed a powerful upcoming model that presents unprecedented cybersecurity risks. The model is known internally as both “Mythos” and “Capybara,” according to the leaked blog post obtained by Fortune.

The source code leak exposed around 500,000 lines of code across roughly 1,900 files. When reached for comment, Anthropic confirmed that “some internal source code” had been leaked within a “Claude Code release.” 

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