In an alert published Tuesday, the FBI, the National Security Agency and the Cybersecurity and Infrastructure Security Agency said top Chinese AI companies have systematically mined cutting-edge AI models from American companies since 2024, including Anthropic’s Claude, OpenAI’s ChatGPT, Google’s Gemini and xAI’s Grok, to build their own.A spokesperson for China’s embassy in Washington did not immediately reply to a request for comment.The practice, known as distillation, is widespread in the AI industry, though it is often against AI companies’ terms of service. American companies and government officials have increasingly alleged in recent months that Chinese models are built by distilling American ones.The U.S. has accused China for years of stealing intellectual property from American companies. Tuesday’s report said the distillation campaign had come “likely with Chinese government awareness,” but it did not claim that China’s intelligence played a role.The White House frequently describes the U.S. as racing China to develop the most cutting-edge AI. President Donald Trump is scheduled to meet with Chinese President Xi Jinping on Sept. 24. Officials from both governments have traded barbs in recent weeks over whether China has been inappropriately stealing AI trade secrets.The report accused six of the leading Chinese AI developers: DeepSeek, Moonshot AI, Alibaba, MiniMax, StepFun and Z.AI. It goes into significant detail, including a long list alleging that certain Chinese models distilled specific topics, like “legal specialization optimization,” “agentic functions” and “coach/assistant capabilities,” from particular American models.“The sheer scale of these campaigns and their sophistication indicate that distillation is not a supplement to these companies’ AI model development, but the critical core of it,” the report said.American companies have made scattered accusations of distillation since at least last year, when OpenAI said DeepSeek had “inappropriately” based its model on ChatGPT. In February, Google said it was inundated with attempts to clone Gemini but declined to name a suspect.The report also includes a list of recommendations for U.S. companies, including doing a better job of verifying users who pay for subscription services to American models and comparing notes with one another about suspicious behavior. It also recommended, in certain cases, downgrading or altering responses to queries believed to be malicious. In April, the director of the White House Office of Science and Technology Policy, Michael Kratsios, circulated a memorandum to the heads of federal agencies highlighting Chinese distillation of American AI systems as a critical issue. He wrote that distillation allowed Chinese companies to freeload off American innovation and circumvent safety guardrails built into American systems.In July, Kratsios declared on X that Moonshot had distilled Anthropic’s advanced Fable model to develop its Kimi K3 system. “Legitimate AI distillation used to create smaller, more efficient models plays a vital role in this open innovation ecosystem,” Kratsios wrote, echoing language in his April memorandum. “However, large-scale, covert industrial distillation aimed at stealing proprietary U.S. technology and undermining American research is unacceptable.”