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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.
Anthropic disabled Mythos 5 and Fable 5 after a US Commerce Department export-control order barred their use abroad. The administration asked for a pause amid reports of a narrow jailbreak letting Fable 5 analyze code for vulnerabilities. Anthropic says the issue produced only minor findings and that other models, like GPT-5.5, have similar capabilities.
- Anthropic disabled Mythos 5 and Fable 5 days after launch due to a Commerce Department export-control order barring their use outside the US.
- The trigger was a narrow jailbreak letting Fable 5 give cybersecurity/chemistry/biology advice on a specific codebase, but it only surfaced minor vulnerabilities.
- Anthropic claims other models like GPT-5.5 have similar capabilities, suggesting the singling-out of Fable 5 is inconsistent.
- The article's own account is internally contradictory: it names the Commerce Department order as Trump-administration action but then attributes the pause to "the Biden administration."