Chinese hackers used Claude for a large-scale cyberattack, alleges Anthropic

Anthropic has exposed and disrupted what it calls the world’s first large-scale cyber espionage campaign orchestrated primarily by AI. Detected in mid-September 2025, the operation, which is attributed to a Chinese state-sponsored group, used Anthropic’s Claude Code tool to infiltrate approximately 30 global targets, including tech giants, financial firms, chemical manufacturers, and government agencies.