Anthropic Launches Claude Fable 5.1 After Every Finds Lower-Token Coding

Anthropic has launched Claude Fable 5.1, a model aimed at long-running coding and knowledge work. In early testing, Every found it matched Claude Opus 5 on comparable agent tasks while using less than half as many tokens and finishing in about 60% of the time. Anthropic's announcement describes Fable 5.1 as generally available, while an early evaluation presents the model as a more practical successor to the original Fable.