Anthropic Ships Two Frontier Models
Fable 5.2 lands ahead of the listing with a price cut, faster output and a bill that is still double the old flagship.
Anthropic released Claude Fable 5.2 and Mythos 5.2 on 9 November 2026, its first frontier models since the company publicly raised the possibility that capability gains were slowing. Fable 5.2 targets the hardest open-ended technical work and scores a tier above Opus 5.5 on coding, reasoning and visual understanding, while generating tokens up to 30% faster. API pricing falls 20% to $8 for input and $40 for output per million tokens, but that cut is measured against Fable 5.1: at these rates the new flagship still costs roughly twice what Opus 5.5 does. Mythos 5.2 is restricted to vetted organisations. Anthropic demonstrated 1,000 agents formalising Fermat’s Last Theorem over 30 hours, and an operating system built from scratch in eight days that runs on a laptop; both are vendor demonstrations rather than independently verified results.
