Claude Fable 5
Create an agent or open an existing agent in the builder, then follow the steps below. Model and feature availability may depend on your plan.
What it does
Anthropic's Fable 5 became available across the model selector.
Before this
An addition to the selector, and the first of its kind on it. Every model available until then was chosen on reasoning against cost; Fable is the first chosen on voice.
Why it matters
Built for long-form writing and character work — the difference shows most on agents that produce prose a human will actually read end to end.
The specs
Fable is Anthropic's model for writing rather than reasoning — the one whose output reads like prose instead of like a competent summary.
- Context
- 999,000 tokens in, up to 128,000 out.
- Input
- Text and images.
- Actions
- Supported.
- Reasoning
- Fast ($$), Smart ($$$), or Smartest ($$$$).
- Plans
- Gold and Pro.
Worth switching to on agents that produce something a person will actually read from start to finish — newsletters, stories, scripts, long client-facing copy — and worth avoiding on agents whose job is to extract a fact.