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Claude threat report

Anthropic accused Alibaba of conducting a large-scale distillation attack on Claude AI models using approximately 25,000 fraudulent accounts created between April 22 and June 5, 2026. The attack involved over 28.8 million interactions with Claude designed to extract knowledge and behavioral patterns to train Alibaba's Qwen AI models without authorization. Anthropic disclosed the incident in a June 10, 2026 letter to U.S. Senate Banking Committee leadership.

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