Anthropic accused Alibaba’s Qwen AI lab of orchestrating a coordinated distillation attack using roughly 25,000 fake accounts that generated over 28.8 million interactions with Claude between April 22 and June 5, 2026. The operation’s goal, according to Anthropic, was to extract Claude’s advanced coding capabilities and use the outputs to train Alibaba’s own Qwen models. The operation reportedly kept individual account activity below standard rate limits, meaning no single account was behaving suspiciously enough to trigger automated defenses. Anthropic outlined its allegations in a letter sent June 10 to US Senators Tim Scott and Elizabeth Warren. The letter became public through Reuters and other outlets around June 24-25. Alibaba has not publicly responded to the allegations. No regulatory action has been announced as a result of Anthropic’s claims.