Compare, 2 models
Side by side.
Claude Fable 5.1 and Claude Sonnet 5.5 on every board at least two of them share. Blue marks the best in each row.
Specs
List prices, context and published output speed. Blue marks the best in each row.
| Spec | Claude Fable 5.1Anthropic | Claude Sonnet 5.5Anthropic |
|---|---|---|
| Lab | Anthropic | Anthropic |
| Type | Language | Language |
| Released | Sep 1, 2026 | Sep 28, 2026 |
| Input price$ per 1M tokens | $10.00 | $2.00 |
| Output price$ per 1M tokens | $50.00 | $10.00 |
| Blended price3 input tokens per output | $20.00 | $4.00 |
| Contexttokens | 1M | 1M |
| Open weights | No | No |
| Output speedTok / s | 72 | 140 |
Benchmarks
Every board where at least two of these models have a published score. Each score links to its source.
| Board | Claude Fable 5.1Anthropic | Claude Sonnet 5.5Anthropic |
|---|---|---|
| Artificial Analysis Intelligence IndexOverall, higher is better | 53Max, Default Fallback | 56 |
| Humanity's Last ExamReasoning and knowledge, higher is better | 46.5%Scale board | 46.1%Scale board |
n/a means the board has not published a score for that model.