Anthropic said in October 2026 that Zhipu switched from distilling Claude Fable 5 to an older Claude model and another lab's model after Claude Fable 5's cyber safeguards degraded its attacks

Anthropic's distillation defenses

Anthropic's October 2026 measures against distillation attacks, which are covert, large-scale efforts to copy a model's capabilities, usually through networks of fraudulent accounts.

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