Anthropic Launches Claude Fable 5 and Mythos 5: Routing and Fallback Guardrails for High-Risk Domains
Anthropic has released Claude Fable 5 and Mythos 5, adding routing or fallback mechanisms for high-risk areas such as biology, chemistry, and cybersecurity. Three sources consistently confirm the safety guardrails and fallback setup, but they differ in how they describe the model naming relationship, the scope of covered domains, and details such as “95% of sessions do not trigger fallback.” Claims about performance, motives, and external impact cannot be confirmed from the provided sources.