Anthropic's Claude Fable 5.1 and Mythos 5.1 arrive with a 75% cost reduction for Fable cache reads
THE SO WHAT
Claude Fable/Mythos 5.1 combining higher capability with a 75% cut in cache read costs is a direct shot at the unit economics of high-traffic assistants and agents. If your AI product is latency-tolerant and prompt-repetitive, you should be re-running your cost models — cached inference is becoming the margin lever.
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