A readable archive

AI System Cards

When AI companies release a new model, the system card is usually a long PDF — and reading a long PDF kind of sucks. This archive re-typesets each one as a faithful, responsive web page — every sentence, table, figure, and footnote, with deep links back to the source — plus clean markdown for both humans and machines (llms.txt).

Fair warning: these are auto-converted, so there’s almost certainly the odd artifact or transcription slip in here. They came out pretty damn good all the same — and the original PDF is one click away on every page.

• Anthropic June 9, 2026 317 pages

  Claude Fable 5 & Claude Mythos 5

  System card for Claude Mythos 5 and Claude Fable 5, two configurations of a new large language model from Anthropic. Covers RSP evaluations, cyber capabilities, safeguards and harmlessness, agentic safety, alignment assessment, model welfare, and capabilities.