Compare, 2 models
Side by side.
Claude Opus 5.5 and Claude Fable 5.1 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 Opus 5.5Anthropic | Claude Fable 5.1Anthropic |
|---|---|---|
| Lab | Anthropic | Anthropic |
| Type | Language | Language |
| Released | Sep 22, 2026 | Sep 1, 2026 |
| Input price$ per 1M tokens | $4.00 | $10.00 |
| Output price$ per 1M tokens | $20.00 | $50.00 |
| Blended price3 input tokens per output | $8.00 | $20.00 |
| Contexttokens | 1M | 1M |
| Open weights | No | No |
| Output speedTok / s | 96 | 72 |
Benchmarks
Every board where at least two of these models have a published score. Each score links to its source.
| Board | Claude Opus 5.5Anthropic | Claude Fable 5.1Anthropic |
|---|---|---|
| Artificial Analysis Intelligence IndexOverall, higher is better | 58Max, Default Fallback | 53Max, Default Fallback |
| LMArena textOverall, higher is better | 1507aggregator snapshot | 1501aggregator snapshot |
| Humanity's Last ExamReasoning and knowledge, higher is better | 67.7%with tools, lab-reported | 46.5%Scale board |
n/a means the board has not published a score for that model.