Anthropic says new defenses cut Claude distillation by up to 99%
Anthropic says its new defenses against distillation attacks have cut the amount of Claude reasoning that copycat labs can harvest by about 90 to 99 percent. The company combines preserved thinking, a red teamed two-stage classifier and fast account bans, names Zhipu's GLM-5.3 as a model built partly on distilled cyber skills, and admits the measures cost legitimate developers something too.