Anthropic's Fable 5.1 hits 90% on ARC-AGI-2 at 32% lower cost per task than Fable 5
rohanpaul_ai · x · 2026-09-03
ARC Prize published verified scores for Anthropic's Fable 5.1:
- ARC-AGI-2: 90.0% at $3.12/task, remarkably close to saturation
- ARC-AGI-1: 97.5% at $1.40/task
The average cost per task is 32% lower than Fable 5 across both benchmarks, driven by better token efficiency rather than reduced accuracy.
Related event: Anthropic's Fable 5.1 Scores 90% on ARC-AGI-2, Nearing Saturation(2 posts)→
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