• Early warnings and a growing pattern
• April–June 2026: The alleged campaign
• Political fallout in Washington
• Alibaba’s position and the wider AI race

Anthropic Accuses Alibaba of ‘Largest Claude Cloning Attack’ Anthropic’s explosive allegation that Alibaba tried to clone its Claude AI has escalated a simmering tech rivalry into a test case for how far companies – and governments – will go in the race for artificial intelligence dominance.

§Early warnings and a growing pattern

For months, US officials and AI firms have warned that Chinese companies are seeking to replicate Western “frontier models” at scale, often via opaque technical means. Anthropic had already accused several Chinese labs of similar behaviour, describing “industrial scale” extraction of model capabilities.

§April–June 2026: The alleged campaign

In a June 10 letter to US senators Tim Scott and Elizabeth Warren, Anthropic policy chief Sarah Heck said operators “affiliated with Alibaba and Alibaba Qwen” carried out “the largest known distillation attack” on Claude to date. Between April 22 and June 5, these operators allegedly generated “28.8 million exchanges with Claude through almost 25,000 fraudulent accounts,” seeking to “illicitly extract Claude’s capabilities” to train Alibaba’s own models.

According to Ars Technica’s account of the same letter, Anthropic said the campaign targeted “some of Claude’s most valuable capabilities, such as agentic reasoning, software engineering, and long-horizon tasks,” while using “obfuscation techniques and proxy networks” to evade detection. The company framed this as an effort to reach “Claude Mythos Preview-level capabilities” without paying the “training and R&D costs required to train US frontier models.”

§Political fallout in Washington

Anthropic has urged Congress to create tougher penalties, warning that such attacks “turn hundreds of billions of dollars in American investment and R&D into a massive subsidy for our geopolitical competitors.” It also wants antitrust rules eased so US labs can share threat intelligence on evolving Chinese tactics.

The clash comes as the US tightens export controls on advanced models and bars foreign users from some systems on national security grounds, while Alibaba has been added to a Pentagon blacklist and is suing the US government over that designation.

§Alibaba’s position and the wider AI race

Alibaba has not publicly detailed its response to the specific distillation claims and “has not responded to Reuters’ request for comments,” according to one report. The dispute lands amid a narrowing performance gap between US and Chinese AI, with new Chinese models challenging the West’s early lead and raising pressure on both sides to protect – or acquire – cutting-edge capabilities by any means.

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