Anthropic Blocks Distillation Attacks

Anthropic strengthened defenses against distillation attacks on Claude, turning away trillions of tokens and reducing harvested data by 90 to 99 percent. New measures include preserving thinking for accounts created on or after August 31, 2026, and restricting reasoning access to the originating organization. These changes involve trade-offs for legitimate users and address national security risks from illicit model replication.