Anthropic mistakenly leaks its own AI coding tool’s source code, just days after accidentally revealing an upcoming model known as Mythos

Hundreds of thousands of lines of code were exposed, giving researchers insight into upcoming models and internal architecture.

Anthropic's AI coding tool leaks its own source code for the second time in a year

A researcher flagged the issue on 31 March 2026, and the code has since been archived on multiple public repositories, raising fresh questions about the company's software release practices.

Claude’s code: Anthropic leaks source code for AI software engineering tool

Nearly 2,000 internal files were briefly leaked after ‘human error’, raising fresh security questions at the AI company ...

Anthropic’s Claude Code Leak Sparks Panic: AI Tool’s Source Code Reportedly Exposed Online Again

Claude Code source code leak as raised fresh concerns after Anthropic’s AI coding tool was reportedly exposed online. From ...

Anthropic accidentally exposes Claude Code source code in npm packaging error

Anthropic PBC has accidently exposed the source code for its Claude Code command-line interface tool through a packaging ...

Anthropic Accidentally Leaks Claude’s Source Code

After a researcher flagged the issue on March 31, the code spread rapidly across public repositories, raising new questions ...

Claude Code leak used to push infostealer malware on GitHub

Threat actors are exploiting the recent Claude Code source code leak by using fake GitHub repositories to deliver Vidar ...

Anthropic's AI coding tool, Claude Code, accidentally reveals its source code; here's what happened

Anthropic accidentally exposed the full source code of its AI tool Claude Code due to a packaging error. While no user data or core AI systems were affected, the leak revealed the tool’s internal ...

Anthropic releases part of AI tool source code in 'error'

Anthropic accidentally released part of the internal source code for its AI-powered coding assistant Claude Code due to ...