Noometry

Model comparison

Grok 4 Fast vs Granite 4.0 H Small

Grok 4 Fast is the stronger model overall, scoring 39.4 to 36.5 on the Noometry Index.

Last verified . 14 shared benchmarks.

Grok 4 Fast xAI

39.4

Rank #167 Confirmed

Granite 4.0 H Small IBM

36.5

Rank #214 Confirmed

Summary

  • They share 14 benchmarks with published results for both. Grok 4 Fast scores higher in 6 categories and Granite 4.0 H Small in 2 categories; 7 gaps are clear of the uncertainty.
  • The widest gap is in long context, where Grok 4 Fast leads 63.2 to 37.7.
  • The biggest single-benchmark swing is Vectara Hallucination Rate: 19.7% for Grok 4 Fast and 5.2% for Granite 4.0 H Small.
  • Granite 4.0 H Small has downloadable open weights; the other is API-only.

Side by side

Grok 4 FastGranite 4.0 H Small
ProviderxAIIBM
Noometry Index39.436.5
Released2025-09-19—
WeightsProprietaryOpen
Context window——
Max output——
Input $ / M tokens——
Output $ / M tokens——
Results tracked3019

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Category by category

Coding Granite 4.0 H Small leads

Grok 4 Fast: 32.5 (#271), Granite 4.0 H Small: 36.4 (#209)

BenchmarkGrok 4 FastGranite 4.0 H Small
LMArena Coding14291249
LMArena WebDev1159—
WeirdML42.9%—

Agentic & Tool Use Not comparable

Grok 4 Fast: 29.5 (#86), Granite 4.0 H Small: —

BenchmarkGrok 4 FastGranite 4.0 H Small
τ²-bench Banking15.7%—
Cybench30%—
LMArena Search1171—

Reasoning Granite 4.0 H Small leads

Grok 4 Fast: 22.2 (#201), Granite 4.0 H Small: 24.4 (#163)

BenchmarkGrok 4 FastGranite 4.0 H Small
LMArena Hard Prompts14121240
ARC-AGI-25.3%—
Kagi LLM Benchmark66.1%—
ARC-AGI-148.5%—
DTBench82.7%—
Epoch Capabilities Index144.2—
ForecastBench60.5—

Math Grok 4 Fast leads

Grok 4 Fast: 38.9 (#123), Granite 4.0 H Small: 31.4 (#223)

BenchmarkGrok 4 FastGranite 4.0 H Small
LMArena Math14191247
Omni-MATH—29.6%

Knowledge Too close to call

Grok 4 Fast: 32.0 (#214), Granite 4.0 H Small: 32.0 (#215)

BenchmarkGrok 4 FastGranite 4.0 H Small
Vectara Hallucination Rate19.7%5.2%
LMArena Expert14111251
MMLU-Pro—56.9%
GPQA (HELM)—38.3%

Multilingual Grok 4 Fast leads

Grok 4 Fast: 51.3 (#111), Granite 4.0 H Small: 38.6 (#228)

BenchmarkGrok 4 FastGranite 4.0 H Small
LMArena Non-English13961216
LMArena Chinese14571249
LMArena Russian13891201
LMArena Spanish14151258
LMArena French1431—
LMArena German1383—
LMArena Japanese1352—
LMArena Korean1357—

Instruction Following Grok 4 Fast leads

Grok 4 Fast: 73.2 (#121), Granite 4.0 H Small: 68.7 (#183)

BenchmarkGrok 4 FastGranite 4.0 H Small
LMArena Instruction Following13871222
IFEval—89%

Long Context Grok 4 Fast leads

Grok 4 Fast: 63.2 (#3), Granite 4.0 H Small: 37.7 (#213)

BenchmarkGrok 4 FastGranite 4.0 H Small
LMArena Longer Query14151242
Fiction.LiveBench94.4%—

Writing & Preference Grok 4 Fast leads

Grok 4 Fast: 60.0 (#102), Granite 4.0 H Small: 43.8 (#227)

BenchmarkGrok 4 FastGranite 4.0 H Small
LMArena Text14071241
LMArena Creative Writing13871211
LMArena Multi-Turn14141242
WildBench—73.9%

Frequently asked questions

Is Grok 4 Fast better than Granite 4.0 H Small?

Grok 4 Fast is the stronger model overall, scoring 39.4 to 36.5 on the Noometry Index.

Is Grok 4 Fast or Granite 4.0 H Small better for coding?

Granite 4.0 H Small scores higher on coding benchmarks: 36.4 versus 32.5 in the Noometry coding category.

How many benchmarks do Grok 4 Fast and Granite 4.0 H Small share?

14 benchmarks have published results for both models. Grok 4 Fast has 30 scored results on Noometry and Granite 4.0 H Small has 19.

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