Anthropic: Fable 5.2 and Mythos 5.2 outperformed Opus 5.5 in almost all capabilities we evaluated. Testers found them to communicate more clearly than previous Fable and Mythos models. Output speed was 30% faster than Fable 5.1 and Mythos 5.1.
2026-11-10
Anthropic: Fable 5.2 and Mythos 5.2 outperformed Opus 5.5 in almost all capabilities we evaluated. Testers found them to communicate more clearly than previous Fable and Mythos models. Output speed was 30% faster than Fable 5.1 and Mythos 5.1.