17 August 2026

Anthropic exposed 133 million contractor requests for over a year

• Safety filters designed to block requests about biological and chemical weapons were accidentally disabled on Anthropic's systems from May 2025 through April 2026.
• During this period, 133 million requests from contractors were stored without the normal protections meant to prevent misuse of the AI system.
• The exposure affected Anthropic, the company behind the Claude chatbot, and involved contractor data rather than public user information.

How it was covered

AI BreakfastIndependent editors

Biological and chemical weapon classifiers were accidentally left off Anthropic's systems between May 2025 and April 2026, leading to exposure of 133 million contractor requests over nearly a year.