anthropic filed a formal accusation against alibaba, alleging the chinese company conducted the largest-ever ai model distillation attack — extracting weight-equivalent capability from anthropic's claude system to produce alibaba's qwen series. anthropic simultaneously called on the us congress to tighten chip export controls and penalize chinese ai labs. this is the first known instance of a frontier us lab filing a formal government-directed accusation against a specific foreign competitor for model theft, converting a technical dispute into an explicit lobbying and policy action.