Anthropic's chem/bio weapons filter was off for nearly a year

Anthropic disclosed that its internal filter for detecting biological and chemical weapons risk was inactive for close to a year, during which roughly 50,000 external contractors ran about 133 million unfiltered interactions with its models. The company revealed the lapse in a safety report.

Why it matters: This is a rare disclosed failure of a frontier lab's own safety infrastructure rather than a hypothetical risk - it's a useful data point against the narrative that leading labs run continuously-verified safeguards, and raises questions about how such gaps get caught, or missed, in practice.