AI Battle > Rankings > Claude Fable 5.1 vs Claude Opus 5
Head-to-head from public datasets. The better value in each row is highlighted; direction is stated per metric — for costs lower is better, for capability and speed higher is better. Pair sourced from the AA-Briefcase Elo ranking.
| Metric | Claude Fable 5.1 | Claude Opus 5 |
|---|---|---|
| Creator | Anthropic | Anthropic |
| Intelligence index | 53.4 | 50.7 |
| Context window (tokens) | 1,000,000 | 1,000,000 |
| Input price / 1M tokens | $10 | $5 |
| Output price / 1M tokens | $50 | $25 |
| Output speed (tok/s) | — | — |
| Time to first token (s) | — | — |
Pair sourced from the AA-Briefcase Elo ranking; leader and runner-up there.
This static page is a snapshot rebuilt daily. The interactive comparison of Claude Fable 5.1 and Claude Opus 5 loads the same numbers from the live API.
Values come from public benchmark datasets and provider list prices; see the methodology for sources, limitations and corrections. Prices are list prices — verify on the provider's pricing page before spending money.