Anthropic’s new safeguards cut AI distillation attacks on Claude models by 90-99%

What happened

Share Anthropic , the developer of the Claude AI models, announced that its new defensive measures have significantly reduced the impact of AI distillation attacks. The recent measures are implemented in the Claude 5-series models, including Fable 5.1, Opus 5.5, and Sonnet 5.5, and have resulted in the banning of tens of thousands of accounts linked to attack campaigns. Anthropic is an artificial intelligence company based in San Francisco, and its products and services include Claude and Claude Code.

Enhanced security measures could boost Anthropic's competitive edge in AI rankings, influencing market dynamics and industry standards. According to a report by Reuters, the safeguards have made it substantially more difficult to extract reasoning tokens from Claude models, with improvements reducing data harvesting by as much as 90% to 99%.

Key facts

• Share Anthropic , the developer of the Claude AI models, — announced: that its new defensive measures have significantly reduced the impact of AI distillation attacks