Anthropic enforces rule to prevent AI model 'distillation' by third parties.

Anthropic has implemented a rule called 'preserved thinking' to prevent the extraction and reuse of its Claude AI's reasoning processes. This rule, which makes message history append-only for new API accounts, is a defense against other labs training their own models on Claude's outputs. The enforcement began for accounts created on or after August 31, 2026, and has required some developers to update their integrations. Anthropic states these anti-distillation measures have reduced harvested data by 90 to 99%.
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