Anthropic Says It Blocked AI Misuse After Its Whistleblower's Safety Warning

Anthropic said Thursday it has blocked efforts by bad actors to use its artificial intelligence models for malicious activity such as cyberattacks, surveillance, and research that could have led to biological weapons.As AI models grow more powerful, elaborate cyberattacks no longer require sophisticated skills and even lone individuals can create threats that would not have been possible even a year ago, Anthropic said. The company said it has added stronger safeguards in its latest models to restrict biological research that could also be used to make weapons."The cases we share here aren't typical misuse, but rather examples of the most notable and novel threat activity we've identified to date," Anthropic said in its third report since March 2025 describing AI misuse.