Tag

#anthropic

1 story tagged anthropic.

Donut chart showing where a Claude Fable 5 call runs: about 95 percent of sessions get the full Mythos-class model and under 5 percent are silently routed to Claude Opus 4.8.

Fable 5 and Mythos 5 are one model with a bouncer

Claude Fable 5 and Claude Mythos 5 are the same Anthropic weights; a runtime classifier, not the model you call, decides which capability you actually get.

Lars Cornelissen · Jun 9, 2026