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Anthropic Accuses Alibaba of the Largest Known Attack on Claude AI

Philiphall •Phil Hall • June 24, 2026

Anthropic has accused Alibaba of running the largest known distillation attack against its Claude AI models using 25,000 fake accounts and 28.8 million exchanges. Here is what happened and what it means for Australian enterprises.

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This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

Anthropic Accuses Alibaba of Largest AI Distillation Attack to Date Anthropic has accused Alibaba of conducting the largest known distillation attack on its Claude AI model. In a letter to US Senators, Anthropic detailed that operators linked to Alibaba executed nearly 29 million exchanges using approximately 25,000 fraudulent accounts between April 22 and June 5, 2026. This attack aimed to illicitly extract Claude's capabilities, including software engineering and reasoning skills. Anthropic described the operation as industrial-scale, warning that such tactics could help Chinese models reach advanced capabilities more quickly. The company urged Congress to implement stricter regulations and penalties against such activities. Alibaba has denied any wrongdoing and is currently involved in legal actions against the US government regarding its designation as a security risk. The incident has raised significant concerns about the implications for US technology and national security. 12 sources 74

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Anthropic Accuses Alibaba of the Largest Known Attack on Claude AI

The full story

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Attack Types (1)

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