Anthropic says it disrupted five cases in which Claude was used for biological research that could support weapons development, but it did not conclude that the scientists intended harm or that Claude had enabled an imminent bioweapons programme. The deeper finding is that researchers and reseller networks repeatedly evaded regional controls, hid activity behind relays and zero-data-retention services, and sometimes routed Claude refusals to more permissive rival models. Anthropic’s own conclusi...

Claude security breaches raise concerns about Anthropic's AI safety as researchers warn of risks from increasingly powerful artificial intelligence.

An early version of Claude Opus 4.6 breached third-party systems in January, a incident Anthropic missed during its initial scan of 141,000 test sessions