Alibaba Group Holding Ltd. shares have tumbled as much as 4.9% in Hong Kong, hitting a 16-month low following Anthropic PBC's formal allegations of illicit AI model access. The stock decline extends this year's decline to 33%, with other Chinese AI firms also facing pressure as Xiaomi Corp. and Baidu Inc. both dropping more than 3%. According to Business Standard, the selloff reflects deepening investor concerns over China's AI ambitions and the company's ability to compete in the global AI race. Robert Lea, an analyst at Bloomberg Intelligence, noted that "Chinese AI models face an elevated risk of a US ban," with the White House's prohibition on foreign access to Anthropic's flagship Fable 5 and Mythos 5 models signaling a shift toward more aggressive US regulatory posture on AI.
According to reports from BBC, Anthropic PBC has formally escalated its allegations against Chinese technology giant Alibaba Group Holding Ltd. by sending a letter to Congress detailing the alleged fraudulent access campaign. The AI startup's letter to lawmakers specifically accuses Alibaba of conducting the largest known distillation attack on Anthropic to date, representing a significant escalation from previous allegations. The letter, addressed to Sen. Tim Scott, R-S.C., and Sen. Elizabeth Warren, D-Mass. on June 10, claims Alibaba carried out 28.8 million exchanges with Claude between April 22 and June 5, 2026 through almost 25,000 fraudulent accounts. As reported by BBC, the company alleged that the exchanges were aimed at collecting Claude's responses to help develop or improve another AI system without permission, marking a formal escalation of the allegations beyond initial reports to Reuters and Bloomberg. The letter represents a significant step in the public confrontation between the two companies, with Anthropic emphasizing that the effort undermined the US AI developer's decision to keep its products out of China.
The dispute has brought AI distillation into sharp focus, a technique that has long been used to build smaller, more efficient AI models but is now facing scrutiny over unauthorized use. According to Business Standard, AI distillation is a technique through which knowledge from a large and highly capable AI model is transferred to a smaller one - the larger system acts as the 'teacher model' while the smaller one is the 'student model'. The process involves the student model learning from the teacher's responses to carefully designed prompts, capturing years of optimization and complex reasoning patterns that would otherwise require enormous computing power. Distillation has been widely accepted for years, with almost every major AI developer including OpenAI, Google, Anthropic and Meta using similar optimization techniques to create faster, cheaper models. However, Anthropic argues that the Alibaba case represents 'adversarial distillation' - a process where another company's AI model is systematically queried without permission to reproduce capabilities. The company claims these interactions were carefully designed to expose Claude's strongest capabilities, including software engineering, complex reasoning and autonomous task execution, with responses then used to improve Alibaba's own Qwen AI models.
According to Reuters and CNBC TV18, lawmakers in Washington are moving to address industry concerns, with Tennessee Republican Bill Hagerty and New Jersey Democrat Andy Kim planning to introduce an amendment to must-pass defense legislation as soon as Wednesday that would blacklist or sanction any Chinese firm found to be improperly accessing US AI model output. A related bipartisan bill in the House, backed by Michigan Republican Bill Huizenga and Democrat Sydney Kamlager-Dove, is also set to be considered for inclusion in the annual defense measure. The Trump administration has taken initial steps on the issue, with White House Office of Science and Technology Policy Director Michael Kratsios publishing a memo in April indicating the US would help crack down on attempts by Chinese companies to exploit outputs from US models. The memo described such practices as different from legitimate research due to their 'industrial scale' and reliance on thousands of proxy accounts. Anthropic urged federal lawmakers to implement more stringent enforcement and defensive frameworks to prevent foreign tech labs from systematically stripping intellectual property from domestic AI research firms and called on Washington to clarify antitrust rules so American companies can more easily share information about distillation-related activities.
As reported by Reuters and CNBC TV18, Anthropic is embroiled in a fresh dispute with the Trump administration, which less than two weeks ago imposed export controls on Anthropic's top two models, citing security concerns. Even after meetings between Anthropic's top technical staff and White House officials last week, little progress has been made to ease tensions and restore service to the company's Fable 5 and Mythos 5 AI systems. The company received an export control directive ordering the suspension of access to its latest Claude models by any foreign national, whether inside or outside the United States, including foreign national Anthropic employees. The government cited 'national security authorities' but didn't specify its concern, with Anthropic telling CNCB that 'both parties are working quickly to get this resolved,' though no timeline has been provided for when the models might come back online. The company is now valued by private investors at $965 billion and is preparing for an initial public offering as the threat of cheaper imitation products from China that siphon away customers looms large.
