In a letter to two U.S. senators dated June 10, U.S. artificial intelligence company Anthropic accused Chinese company Alibaba of "illicitly" extracting the capabilities of its Claude AI model at the "largest" levels that the AI lab has measured, the Financial Times reported on June 24. Anthropic also argued for Congress to limit China's access to advanced U.S. computing power via export controls and clarify antitrust rules so U.S. AI labs can share information about detecting and preventing Chinese distillation attacks, by which labs issue high numbers of queries to AI models to analyze their responses and reasoning.