Anthropic cuts Claude token theft by up to 99 percent
The Decoder: Anthropic says it cut Claude reasoning token theft by up to 99% in fight against industrial-scale distillation
Anthropic says it has cut the extraction of Claude's internal reasoning tokens by 90 to 99 percent. The company links the large-scale distillation attacks to Chinese companies Zhipu and Moonshot, and has already banned tens of thousands of accounts. The article Anthropic says it cut Claude reasoning token theft by up to 99% in fight against industrial-scale distillation appeared first on The Decoder.
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Anthropic has deployed new security measures to defend Claude from distillation attacks, where companies systematically copy an AI model's capabilities to train smaller competing models. The company reports reducing the theft of reasoning tokens, which represent the model's internal thinking steps, by 90 to 99 percent after implementing defenses that restrict access to internal reasoning, detect extraction attempts, and automatically ban flagged accounts. Attackers have used networks of hundreds of thousands of fake accounts to conduct these large-scale thefts, with stolen capabilities potentially ending up in foreign military and surveillance systems. Anthropic is urging other AI developers to adopt similar protections, though the company acknowledges that legitimate users are also being affected by these security measures.
Explainer: GLM 5.2: How a 744B Open Model Is Closing the Gap With Claude Opus on Code
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