Which is better, Claude Fable 5.1 or Nemotron 3 Ultra 550B A55B?

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Claude Fable 5.1 vs Nemotron 3 Ultra 550B A55B

28 SHARED BENCHMARKS

Across 28 shared benchmarks, Claude Fable 5.1 scores higher on 26 and Nemotron 3 Ultra 550B A55B on 2. The widest gap is critpt, where Claude Fable 5.1 scores 31.1 against 3.1. Nemotron 3 Ultra 550B A55B is the cheaper of the two on tracked API pricing ($0.60 against $10.00 per million input tokens).

ANTHROPICVSNVIDIA28 SHARED26–2 HEAD-TO-HEAD

BenchmarkClaude Fable 5.1MARGINNemotron 3 Ultra 550B A55B

AA Agentic Index58.221.7

AA Intelligence56.838

AA-LCR85.379.3

AA-Omniscience43.5-0.4

Artificial Analysis Coding Index81.649.3

critpt31.13.1

gdpval63.346.7

GDPval-AA v218531164

GPQA Diamond93.787

HLE6537.4

HLE (with tools)6537.4

livebench_agentic_coding66.138.7

livebench_coding86.470.7

livebench_data_analysis80.354.5

livebench_instruction_following7373.5

livebench_language89.570.8

livebench_math9788.7

livebench_reasoning91.774.7

MCP Atlas87.244.7

OmniScience Accuracy67.222.6

OmniScience Non-Hallucination34.470.3

scicode63.144.6

simplebench86.641.7

simpleqa_verified70.832.4

SWE-bench Multilingual89.167.7

TauBench V3 - Banking47.214.2

Terminal-Bench 2.191.456.4

Toolathlon Verified77.834.3

Best tracked score per model per benchmark (default configuration; source-attributed). ↓ marks lower-is-better metrics. Open either model for its full surface, provenance and pricing. Quoted rates are the price-setter row we currently track for each model — its direct or vendor-official listing where one exists (anthropic-official, direct), otherwise the lowest tracked offer.