Claude Fable 5.1 and Mythos 5.1: Anthropic's New Models Beat Opus 5 and Cut Agentic Costs by Up to 45%
Anthropic's Claude Fable 5.1 and Mythos 5.1 arrive with stronger coding than Opus 5, cache reads at $0.25/M tokens, and up to 45% savings on agentic workloads.