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Anthropic says Alibaba illicitly extracted Claude AI model capabilities

Anthropic said the campaign used nearly 25,000 fake accounts and 28.8 million Claude exchanges to train Alibaba’s models, and it urged new U.S. restrictions.

  • On Wednesday, Anthropic sent a letter to the Senate Committee on Banking, Housing, and Urban Affairs accusing Alibaba of "brazenly" and "illicitly" attempting to extract its artificial intelligence capabilities, CNBC confirmed.
  • Addressed to Sen. Tim Scott and Sen. Elizabeth Warren, the letter detailed 28.8 million exchanges from roughly 25,000 fraudulent accounts, describing it as "the largest known distillation attack on Anthropic to date."
  • Anthropic wrote that Alibaba "ignored the Trump Administration's warnings" while proceeding with the campaign, following February reports identifying three similar "industrial-scale" distillation campaigns from DeepSeek, Moonshot, and MiniMax.
  • Earlier this month, Anthropic received a Trump Administration export control directive suspending access to Claude models Fable and Mythos for foreign nationals, though the company told CNBC that "both parties are working quickly to get this resolved."
  • An Anthropic spokesperson said, "We believe combating the threat of illicit distillation requires coordinated action between government and industry," noting the company will continue working with Congress and the Administration to maintain American AI leadership.
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Bloomberg broke the news in New York, United States on Wednesday, June 24, 2026.
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