Anthropic launches Claude Fable 5.1 and says it’s up to 45 percent cheaper for agentic work

Anthropic's Claude Fable 5.1 and Mythos 5.1 arrive with a 75% cost reduction for Fable cache reads

Anthropic Launches Claude Fable 5.1 With Lower Costs and Fewer False Positives

Claude Fable 5.1