# Claude Fable (slim)

> Claude Fable, a family of models by Anthropic, listed from OpenRouter. Indexed, not reviewed: facts and our own checks, no score or ranking. Claude Fable 5.1 improves on Claude Fable 5 across the board, with the biggest gains in agentic coding, long-running agentic workflows…

- Full: https://www.anchorterminal.com/tools/claude-fable.md (~550 tokens) · this version ~480 tokens · JSON https://www.anchorterminal.com/tools/claude-fable.json · canonical https://www.anchorterminal.com/tools/claude-fable
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-04

# Claude Fable

> Indexed, not reviewed: facts from OpenRouter and our own checks. No score, grade or rank, and not in the rankings until the panel reviews it. How the index works: https://www.anchorterminal.com/indexed/

- Kind: model family, by Anthropic
- Category: Model APIs & inference (https://www.anchorterminal.com/categories/inference.md)
- Listed because: OpenRouter lists it, with prices from the providers that serve it.
- What OpenRouter says: Claude Fable 5.1 improves on Claude Fable 5 across the board, with the biggest gains in agentic coding, long-running agentic workflows, and knowledge work: long code refactors, front-end and visual...
- Some of these models are reviewed as part of Claude API: https://www.anchorterminal.com/tools/anthropic-api.md

## Models (2)

| Model | OpenRouter id | Released | Context | Input $/1M | Output $/1M | Supports |
| --- | --- | --- | --- | --- | --- | --- |
| Claude Fable 5.1 | `anthropic/claude-fable-5.1` | 2026-09 | 1M | $10 | $50 | tools, structured output, reasoning, caching, file, image |
| Claude Fable 5 | `anthropic/claude-fable-5` | 2026-06 | 1M | $10 | $50 | tools, structured output, reasoning, caching, file, image |

Prices and limits as OpenRouter lists them; a provider's own price can differ.

- JSON: https://www.anchorterminal.com/api/v1/tools/claude-fable.json
- Being indexed says nothing about quality, and nobody can pay for it. Ask for a review: https://www.anchorterminal.com/builders/#claiming