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P1 Model Generally available AI securityLanguage models20:00 updateAnthropic

Anthropic strengthens defenses against unauthorized distillation of Claude, says attackers now get 90–99% less reasoning data (report)

Announced October 12, 2026

Verified (fact)

According to AI Times, Anthropic announced on the 12th (local time) that it has strengthened its defenses against distillation attacks, which try to copy Claude's reasoning abilities without permission. It improved protection of reasoning data and attack detection, and banned a large number of accounts involved in repeated attacks.

Needs fact-check (claim)

Anthropic claims the new security measures have cut the amount of reasoning data attackers can collect by about 90–99% compared with before. The report does not say under what conditions this figure was measured.

Why it matters (interpretation)

This shows that efforts to stop the practice of collecting a frontier model's outputs to train competing models are getting serious. If these measures change how the reasoning process is shown in the API, users who relied on it for legitimate purposes could also be affected.

Confidence medium · official source pending

Sources

More about Anthropic