A readable archive
AI System Cards
AI companies publish their safety work as long PDFs — a system card when a model ships, a risk report in between — 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.
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Claude Fable 5.1 & Claude Mythos 5.1
System card for Claude Fable 5.1 and Claude Mythos 5.1, two configurations of Anthropic’s latest and most capable large language model, sharing identical weights but differing in safeguards. Covers RSP evaluations, cyber capabilities, safeguards and harmlessness, agentic safety, alignment assessment, model welfare, and capabilities.
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Risk Report: August 2026
Anthropic’s Risk Report for August 2026 (public redacted edition), published under version 3.4 of the Responsible Scaling Policy. Unlike a system card, it assesses catastrophic risk from Anthropic’s activities as a whole — misalignment in high-stakes settings, automated AI R&D, and chemical and biological weapons production — across all models including Claude Mythos 5 and the unreleased internal “Model 2”, together with security controls, deployment safeguards, and cross-cutting considerations.
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Claude Opus 5
System card for Claude Opus 5, an upgrade to Claude Opus 4.8 from Anthropic. Covers RSP evaluations, cyber capabilities, safeguards and harmlessness, agentic safety, alignment assessment, model welfare, and capabilities.
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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.