Source Intelligence

DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v2.1.181

Refusal Message and Category Improvements

Refusal handling has been refactored to better distinguish between model-level safety measures and topic-specific restrictions:

  • frontier_llm and reasoning_extraction are now recognized as known refusal categories with dedicated handling.
  • Cybersecurity refusals now surface an exemption link: https://claude.com/form/cyber-use-case
  • Refusal messages now explicitly call out which model triggered the block (using a readable model name via Mp() rather than a raw model ID).
  • The stop_details.category type is now an open string schema to forward new categories before schema updates ship.
Evidence

Cybersecurity exemption URL (search for "https://claude.com/form/cyber-use-case") — xTd constant at line ~265379; category helpers (search for "frontier_llm") — GNi() at line ~265278

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Related

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

See this entry in the whole of v2.1.181 →