Anthropic says it 'disrupted' what it calls 'the first documented case of a large-scale AI cyberattack executed without substantial human intervention'

Anthropic, the $183 billion San Francisco–based AI company known for the Claude chatbot, said it thwarted what it called the first documented, large-scale cyberattack orchestrated predominantly by artificial intelligence. The attack, it said on X , “has significant implications for cybersecurity in the age of AI agents.”

Anthropic released a blog post about the incident on Thursday. The company said it detected “suspicious activity” in mid-September that, upon investigation, showed “a highly sophisticated espionage campaign.”

“According to the company, “”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.

Anthropic said, with “high confidence,” it identified the th