Anthropic has accused Chinese tech giant Alibaba of orchestrating the largest known campaign to illicitly extract capabilities from its Claude AI model. In a letter to U.S.
senators, Anthropic revealed that Alibaba-affiliated operators generated over 28.8 million exchanges with Claude using nearly 25,000 fraudulent accounts between April 22 and June 5. The attacks targeted advanced features such as agentic reasoning, software engineering, and long-horizon tasks, and came after Anthropic restricted access to its models in foreign markets following the release of its Mythos cybersecurity AI.
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