Anthropic says Fable 5.1 will cost an estimated 25% less than Fable 5 for typical workloads and up to 45% less for highly agentic work (Zac Hall/9to5Mac)

Anthropic has launched Claude Fable 5.1 for general use and Claude Mythos 5.1 for trusted partners, positioning them as its most advanced models for coding and knowledge work. The company claims Fable 5.1 reduces typical workload costs by roughly 25 percent and can cut costs up to 45 percent for highly agentic tasks.