The stop_details.category field on refusal responses now includes "reasoning_ext
The stop_details.category field on refusal responses now includes "reasoning_extraction" on Claude Fable 5, returned when a request is blocked under Anthropic's Terms of Service restrictions on reverse engineering or duplicating model outputs. The existing "cyber" and "bio" categories are unchanged. No beta header is required.
출처: Claude Platform 릴리스 노트 (원문 보기)