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Claude Fable 5.1

Anthropic·Operational·Released 2026-09-01textvision
Context1,000k
Max output128k
Input / 1M$10 ↗
Output / 1M$50 ↗
Cached in$0.25
Benchmarks8

Benchmarks

Cited public sources · rank is exact-benchmark, apples-to-apples

FrontierMath Tier 4 v2 (Epoch AI run)#2/4487.8% ↗
FrontierMath Tiers 1-3 v2 (Epoch AI run)#2/5990.2% ↗
OTIS Mock AIME 2024-2025 (Epoch AI run)#1/76100% ↗
SimpleQA Verified (Epoch AI run)#3/5370.8% ↗
CursorBench 3.2.0#1/273.4% ↗
GDPval-AA v2#1/71853 ↗
Humanity's Last Exam (no tools)#1/2960.9% ↗
Terminal-Bench Science 0.1#2/352.6% ↗

Compare

vs GPT-6 Astravs GPT-5.6 Solvs GPT-5.6 Terravs GPT-5.6 Lunavs Claude Opus 5vs Claude Sonnet 5vs Claude Haiku 4.5vs Gemini 3.8 Flash

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Claude Opus 5Claude Sonnet 5Claude Haiku 4.5Claude Opus 4.8Claude Opus 4.7Claude Opus 4.6

Access Claude Fable 5.1 and every other model through one endpoint with automatic failover: Respan gateway.