Anthropic releases Claude Fable 5 and Mythos 5, its most capable model made generally available

Fable 5 is a Mythos-class model that is state-of-the-art on nearly every benchmark; high-risk queries (cyber, bio) are silently routed to Opus 4.8. Priced at $10/M in, $50/M out — 2x Opus 4.8.