System Card: Claude Fable 5 and Claude Mythos 5
Original: System Card: Claude Fable 5 and Claude Mythos 5 [pdf]
Anthropic releases official system cards for Claude Fable 5 and Mythos 5, detailing capability evaluations, safety testing, and risk mitigations.
Anthropic has published system cards for its two newest flagship models, Claude Fable 5 and Claude Mythos 5, following its standard responsible-release practice. These documents cover dangerous capability evaluations, ASL safety-level determinations, red-teaming results, and alignment assessments under the company's Responsible Scaling Policy. They serve as primary references for safety researchers, enterprise buyers, regulators, and developers assessing model risk and deployment suitability.
Anthropic released the System Cards for Claude Fable 5 and Claude Mythos 5 in June 2026, official safety evaluation documents published alongside the two new-generation flagship models. System Cards are a transparency practice that Anthropic has long maintained, designed to allow external researchers, policymakers, enterprise customers, and the general public to understand the rigorous safety evaluation process that models undergo before deployment.
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