
Anthropic updates Claude Fable 5.1 with 75% cheaper cache fees
Anthropic has released Claude Fable 5.1 and Mythos 5.1, which may help address enterprise concerns about cost and privacy. The update lowers some refusal rates and reduces prompt-cache read fees by 75%, which could cut typical costs by about 25% and help certain workloads even more. Early tests suggest Fable 5.1 performs better on science and coding tasks compared to earlier versions and some competitors. The new models also appear to block fewer harmless requests while keeping security protections. Some early users report benefits, but questions about meeting all data regulations may remain.













