Claude Fable 5.2 Sets ECI Record of 174, Topping GPT-6 Astra

Claude Fable 5.2 set a new Epoch Capabilities Index record of 174.24, surpassing GPT-6 Astra's 169.16 in what Epoch calls the third-largest jump of the reasoning era; early benchmarks also show 94% on SimpleQA, fueling speculation about its scale.

2026-11-10 ~ 2026-11-10 · 4 related posts

• Claude Fable 5.2 tops Epoch Capabilities Index at 174, though RLI benchmark still missing — OddConsideration7290 · 2026-11-10
• Claude Fable 5.2 sets ECI record at 174, third-biggest frontier jump since reasoning era began — ChrisGPT · 2026-11-10
• Claude Fable 5.2 Early Benchmarks: ECI 174 #1, 100% on FrontierMath Tier 4, 94% SimpleQA — Jsevillamol · 2026-11-10

1 near-duplicate retellings: Miles_Brundage