Claude Fable 5.1
Escalate here for multi-hour agents, whole-codebase work, deep research, dense visual documents, and problems where shortcuts are costly.
- 1M
- context tokens
- 128K
- max output
- High
- default effort
F5.1
Model selection, without the guesswork
Fable 5.1 for depth.
Opus 5 for range.
Choose by job shape. Fable is built for the hardest long-running projects. Opus brings careful verification and strong creative, analytical, and coding work at a lower price point.
Claude Opus 5
Use for precise coding, finance, science, office documents, visual builds, and agent workflows that benefit from self-checking and faster iteration.
- 1M
- context tokens
- 2.5×
- optional fast mode
- ½
- Fable 5 price
O5
Use-case library
8 guides shown