Claude Fable 5.1 vs Sonar
Side-by-side specs, pricing and capabilities. Both models run on Clade under one subscription, so you can switch between them in the same conversation.
Claude Fable 5.1 comes from Anthropic and Sonar from Perplexity. The practical difference for most people is context, price, and which input types each one accepts.
Claude Fable 5.1 holds more in a single conversation — 1M tokens against 128K — which matters for long documents and large codebases.
Sonar is the cheaper of the two on input tokens at $1.00 / 1M tokens.
| Specification | Claude Fable 5.1 | Sonar |
|---|---|---|
| Provider | Anthropic | Perplexity |
| Model ID | claude-fable-5-1 | sonar |
| Context window | 1M | 128K |
| Max output | 128K | — |
| Input price | $10.00 / 1M tokens | $1.00 / 1M tokens |
| Output price | $50.00 / 1M tokens | $1.00 / 1M tokens |
| Knowledge cutoff | 2026-06 | — |
| Input types | text, image, file | text, image, file |
| Output types | text | text |
| Plan | All paid plans | All paid plans |
Which should you use?
Pick Claude Fable 5.1 when…
- You need the larger context window — 1M against 128K.
- You want longer single responses — up to 128K output tokens.
Pick Sonar when…
- Cost matters: input runs at $1.00 / 1M tokens versus $10.00 / 1M tokens.
Related comparisons
Try both on Clade
You do not have to choose. One Clade subscription gives you Claude Fable 5.1, Sonar, and every other model on the platform.