India, Nov. 15 -- IT firm Anthropic has said it thwarted a Chinese state-sponsored AI cyber attack, documenting one of the first events in the history of Artificial Intelligence.

Anthropic is the maker of chatbot Claude.

Sharing details about the event, Claude said, "In mid-September 2025, we detected suspicious activity that later investigation determined to be a highly sophisticated espionage campaign. The attackers used AI's 'agentic' capabilities to an unprecedented degree-using AI not just as an advisor, but to execute the cyberattacks themselves."

The company said it launched an investigation after detecting the trouble.

"Over the following ten days, as we mapped the severity and full extent of the operation, we banned accounts ...