Anthropic
Claude Fable 5.1
anthropic/claude-fable-5.1
Fable 5 improved for long refactors, front-end work and knowledge tasks.
TextText, Images, Files → TextReady on endue
- Coding
- Agentic work
- Long documents
Overview
Good for
Written by endue
- Coding
- Agentic work
- Long documents
Not ideal for
From the model’s specs
Nothing in the specs rules out common agent work.
Capabilities
| Tool use | Supported |
|---|---|
| Structured output | Supported |
| JSON mode | Supported |
| Reasoning | Supported |
| Vision | Supported |
| Audio input | Not supported |
| Video input | Not supported |
| File input | Supported |
| Long context | Supported |
Specifications
- Model ID
anthropic/claude-fable-5.1- Family
- Claude Fable
- Context window
- 1M tokens
- Input
- Text, Images, Files
- Output
- Text
- Released
- 2026-09-01