Anthropic Accidentally Exposes System Behind Claude Code

Several experts also raised concerns about potential security vulnerabilities in light of the unintended exposure.
Photographer: Gabby Jones/Bloomberg

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By Shirin Ghaffary and Mark Anderson

April 1, 2026 at 2:28 AM UTC

Updated on

April 1, 2026 at 12:23 PM UTC

Anthropic PBC inadvertently released internal source code behind its popular artificial intelligence-powered Claude coding assistant, raising questions about the security of an AI model developer that has built its brand on prioritizing safety.

“Earlier today, a Claude Code release included some internal source code. No sensitive customer data or credentials were involved or exposed,” Anthropic said in an emailed statement late Tuesday. “This was a release packaging issue caused by human error, not a security breach.”