anthropic
Anthropic ships Fable 5.1: agentic science score more than doubles as costs drop
Fable 5.1 is everywhere today: agentic scientific research jumps from 24.7 to 52.6 and agentic coding from 42 to 55.8, while cache reads get 75 percent cheaper. Restricted-access Mythos 5.1 arrives alongside it.