Anthropic told the Senate that Alibaba used about 25,000 fake accounts to run 28.8 million prompts against its Claude models between April 22 and June 5, calling it the largest known distillation attack on the company. At the same time, Anthropic faces a U.S. export control order suspending foreign access to its newest Claude models and is meeting with the Trump administration to resolve the dispute.

• Anthropic accused Alibaba of running roughly 25,000 fake accounts to send 28.8 million prompts to Claude between April 22 and June 5, calling it the largest known distillation attack on its models.
• Anthropic is simultaneously fighting a Commerce Department order forcing it to cut off foreign nationals, including its own non-U.S. staff, from its newest Claude models (Fable 5 and Mythos 5), citing unspecified national security concerns.
• Anthropic is lobbying Congress and the White House for industry-wide cooperation with cloud providers to detect and block distillation attacks, while also negotiating directly with the Trump administration to lift the export suspension.