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Anthropic Tells US Senators Alibaba Illicitly Accessed Claude

  • Policy & Regulation
  • Foundation Models
  • Security

In a June 10, 2026 letter, Anthropic accused operators tied to Alibaba and its AI lab "Qwen" of running a large-scale "distillation attack" against Claude using roughly 25,000 fraudulent accounts. The letter was sent to Senate Banking Committee Chairman Tim Scott and ranking member Elizabeth Warren, and shared with White House officials. According to reports, Anthropic characterized it as the largest known distillation attack against the company to date.

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