Claude Fable 5 is Anthropic's top-tier Mythos-class assistant with adaptive thinking always on. Our tests show it is outstanding at creative writing and emotional support—warm, literary, and careful with tone when someone is stressed or asking for a hard conversation. It is also strong at reading dense material and giving thoughtful advice. Where it falls short of the very best assistants is finishing long, messy real-world tasks: it can overthink, move slowly, and cost more than models that simply get the job done. Reach for Fable when voice, empathy, and prose matter most.