Noometry

Model comparison

Grok 4 Fast vs Nemotron-4 15B

Grok 4 Fast has enough public results to be ranked (#167); Nemotron-4 15B does not yet, so treat this comparison as directional.

Last verified . 1 shared benchmarks.

Grok 4 Fast xAI

39.4

Rank #167 Confirmed

Nemotron-4 15B NVIDIA

—

Unranked

Summary

  • They share 1 benchmark with published results for both.

Side by side

Grok 4 FastNemotron-4 15B
ProviderxAINVIDIA
Noometry Index39.4—
Released2025-09-192024-02-26
WeightsProprietaryProprietary
Context window——
Max output——
Input $ / M tokens——
Output $ / M tokens——
Results tracked308

Sponsored placements are available on pages like this one. Advertise on Noometry

Category by category

Coding Not comparable

Grok 4 Fast: 32.5 (#271), Nemotron-4 15B: —

BenchmarkGrok 4 FastNemotron-4 15B
LMArena WebDev1159—
WeirdML42.9%—
LMArena Coding1429—

Agentic & Tool Use Not comparable

Grok 4 Fast: 29.5 (#86), Nemotron-4 15B: —

BenchmarkGrok 4 FastNemotron-4 15B
τ²-bench Banking15.7%—
Cybench30%—
LMArena Search1171—

Reasoning Not comparable

Grok 4 Fast: 22.2 (#201), Nemotron-4 15B: —

BenchmarkGrok 4 FastNemotron-4 15B
Epoch Capabilities Index144.2107.72
ARC-AGI-25.3%—
Kagi LLM Benchmark66.1%—
ARC-AGI-148.5%—
LMArena Hard Prompts1412—
DTBench82.7%—
BIG-Bench Hard—58.7%
ForecastBench60.5—
HellaSwag—82.4%
PIQA—82.4%
WinoGrande—78%

Math Not comparable

Grok 4 Fast: 38.9 (#123), Nemotron-4 15B: —

BenchmarkGrok 4 FastNemotron-4 15B
LMArena Math1419—
GSM8K—46%

Knowledge Not comparable

Grok 4 Fast: 32.0 (#214), Nemotron-4 15B: —

BenchmarkGrok 4 FastNemotron-4 15B
Vectara Hallucination Rate19.7%—
LMArena Expert1411—
ARC (AI2) Challenge—55.5%
MMLU—58.7%

Multilingual Not comparable

Grok 4 Fast: 51.3 (#111), Nemotron-4 15B: —

BenchmarkGrok 4 FastNemotron-4 15B
LMArena Non-English1396—
LMArena Chinese1457—
LMArena French1431—
LMArena German1383—
LMArena Japanese1352—
LMArena Korean1357—
LMArena Russian1389—
LMArena Spanish1415—

Instruction Following Not comparable

Grok 4 Fast: 73.2 (#121), Nemotron-4 15B: —

BenchmarkGrok 4 FastNemotron-4 15B
LMArena Instruction Following1387—

Long Context Not comparable

Grok 4 Fast: 63.2 (#3), Nemotron-4 15B: —

BenchmarkGrok 4 FastNemotron-4 15B
Fiction.LiveBench94.4%—
LMArena Longer Query1415—

Writing & Preference Not comparable

Grok 4 Fast: 60.0 (#102), Nemotron-4 15B: —

BenchmarkGrok 4 FastNemotron-4 15B
LMArena Text1407—
LMArena Creative Writing1387—
LMArena Multi-Turn1414—

Frequently asked questions

Is Grok 4 Fast better than Nemotron-4 15B?

Grok 4 Fast has enough public results to be ranked (#167); Nemotron-4 15B does not yet, so treat this comparison as directional.

How many benchmarks do Grok 4 Fast and Nemotron-4 15B share?

1 benchmark has published results for both models. Grok 4 Fast has 30 scored results on Noometry and Nemotron-4 15B has 8.

Related comparisons

Go deeper