← Back to feedAI SecurityEmerging1 sourceSep 1, 2026 · 18:27via Anthropic (security & safety)Claude Fable 5.1 & Claude Mythos 5.1 System Card - www-cdn.anthropic.comBriefClaude Fable 5. 1 & Claude Mythos 5. 1 System Card www-cdn. anthropic. comRead more on Anthropic (security & safety)→AI SecurityRelated stories