Anthropic said Thursday it had blocked efforts by bad actors to use its artificial intelligence models for malicious activity such as research that could have led to biological weapons and an apparent effort by Yemen’s Iran-backed Houthi rebels to build guided missiles.
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. The report includes snippets of the malicious code and AI prompts Anthropic said it found and it urged governments and AI competitors to identify and prevent similar abuse.
“We’re publishing this work because we believe we have a responsibility to disclose malicious misuse of our services. As models become increasingly capable, their risks will increase, unless AI developers and society’s defenders act to make them safer,” the company said.
