Did Anthropic describe the attack as the largest known incident of its kind?

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Anthropic Identified Alibaba's Distillation Effort as the Largest Known Attack of Its Kind

Anthropic has accused Alibaba of illicitly extracting its Claude AI model capabilities, describing the operation as the largest known attack of its kind against the company. This accusation was detailed in a letter to US Senators, highlighting a sophisticated "distillation" campaign that aimed to replicate Anthropic's advanced AI functionalities. The alleged campaign ran from April 22 to June 5, 2026, generating over 28.8 million exchanges with Claude across nearly 25,000 fraudulent accounts.
Alibaba Accused of Distillation Campaign

The core of Anthropic's accusation centres on a practice known as "distillation." This method involves training a less advanced AI model by using the outputs generated by a more capable model, such as Anthropic's Claude. Anthropic stated in its letter that such efforts by operators affiliated with Alibaba and its AI lab, Alibaba Qwen, are intended to accelerate China's ability to achieve capabilities similar to Anthropic's Mythos Preview.
Extensive Scale of the Operation

Anthropic detailed the significant scale of the alleged attack orchestrated by Alibaba. The campaign reportedly spanned a period of over six weeks, involving a substantial volume of interactions with its Claude AI model. The generation of more than 28.8 million exchanges through almost 25,000 fraudulent accounts underscores the extensive nature of the operation.
Broader Context of AI Security Concerns

This incident occurs within a wider landscape of concerns regarding the security of artificial intelligence intellectual property. The White House previously accused China of stealing US AI labs' intellectual property on an industrial scale. Anthropic itself had previously identified other Chinese AI labs, including DeepSeek, Moonshot AI, and MiniMax, engaging in similar illicit extraction campaigns, noting an increase in the intensity and sophistication of these threats. Anthropic expressed its support for US government efforts to combat such attacks through threat-intelligence sharing and industry collaboration.

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Did Anthropic describe the attack as the largest known incident of its kind?

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