Anthropic adds defenses against Claude distillation attacks
Anthropic says the defenses make it harder to use Claude’s reasoning to train other models, though some legitimate users face integration changes or blocked requests.
• Anthropic says new Claude defenses have reduced reasoning data harvested by distillers by about 90 to 99 percent.
• The defenses restrict reasoning access, screen extraction attempts and limit accounts that repeatedly make them.
• Some developers have had to update integrations, and Anthropic now charges for certain blocked requests.
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October 13, 2026 31
