Anthropic's Claude Fable 5.1 cuts costs up to 45% for agentic tasks

Anthropic's newest AI models, Claude Fable 5.1 and Mythos 5.1, are here, and the company is making a direct play for enterprise budgets: it claims Fable 5.1 delivers stronger performance than its predecessor, Fable 5, while costing roughly 25% less on typical workloads and up to 45% less for complex agentic tasks. The cost reduction is tied to cheaper pricing on cached data - inputs already processed and stored by Anthropic - which is a quiet but massive lever for customers running repetitive, multi-step workflows. The headline number isn't marketing fluff; it's a concrete answer to the #1 complaint from AI buyers: price.

That pricing win is paired with a performance bump that early adopters are already vouching for. Every CEO Dan Shipper, a prominent voice in the AI startup world, posted: "It's the strongest coding model we've used, but now it's fast, token-efficient, and crucially actually speaks like a normal person.