Anthropic's Fable 5.1 Scores 90% on ARC-AGI-2, Nearing Saturation

ARC Prize reports Anthropic's Fable 5.1 scores 90.0% on ARC-AGI-2 and 97.5% on ARC-AGI-1, with per-task cost down 32% to $3.12. Hands-on tests confirm strong performance but frequent failures on format-constrained tasks.

2026-09-03 ~ 2026-09-03 · 2 related posts

• Fable5.1 hands-on roundup: 90% on ARC-AGI-2 at 32% lower cost, but ignores format constraints — 量子位 · 2026-09-03
• Anthropic's Fable 5.1 hits 90% on ARC-AGI-2 at 32% lower cost per task than Fable 5 — rohanpaul_ai · 2026-09-03