Claude Fable 5.1 tops Artificial Analysis Intelligence Index, but per-task cost is 20% higher than Fable 5

Claude Fable 5.1 登顶 Artificial Analysis 智能指数，但每任务成本比 Fable 5 高 20%

Artificial Analysis tested Claude Fable 5.1 at max effort and it scored 66, hitting #1 on their Intelligence Index. The trade-off: per-task cost is 20% higher than Fable 5. The post doesn't break down task types or latency—just the headline and a one-line result.

Why it matters: A new Anthropic model tops a third-party benchmark with concrete score and cost data — enough substance to feature. But without task breakdowns or latency numbers, it's a solid news bite, not an 85+ story.