Noometry

Model comparison

Gemma 4 31B IT vs Grok 4 Fast

Gemma 4 31B IT is the stronger model overall, scoring 43.2 to 39.0 on the Noometry Index.

Last verified . 20 shared benchmarks.

Gemma 4 31B IT Google

43.2

Rank #85 Confirmed

Grok 4 Fast xAI

39.0

Rank #164 Confirmed

Summary

  • They share 20 benchmarks with published results for both. Gemma 4 31B IT scores higher in 7 categories and Grok 4 Fast in 1 category; 7 gaps are clear of the uncertainty.
  • The widest gap is in long context, where Grok 4 Fast leads 63.2 to 44.2.
  • The biggest single-benchmark swing is Vectara Hallucination Rate: 7.4% for Gemma 4 31B IT and 19.7% for Grok 4 Fast.
  • Gemma 4 31B IT has downloadable open weights; the other is API-only.

Side by side

Gemma 4 31B ITGrok 4 Fast
ProviderGooglexAI
Noometry Index43.239.0
Released2026-04-022025-09-19
WeightsOpenProprietary
Context window262K—
Max output33K—
Input $ / M tokens$0.09—
Output $ / M tokens$0.34—
Results tracked3530

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Category by category

Coding Gemma 4 31B IT leads

Gemma 4 31B IT: 41.9 (#98), Grok 4 Fast: 32.3 (#264)

BenchmarkGemma 4 31B ITGrok 4 Fast
LMArena WebDev13641160
WeirdML52.3%42.9%
LMArena Coding14591429
SciCode43.4%—
ALE-Bench925.5—

Agentic & Tool Use Not comparable

Gemma 4 31B IT: —, Grok 4 Fast: 29.3 (#80)

BenchmarkGemma 4 31B ITGrok 4 Fast
τ²-bench Banking—15.7%
Cybench—30%
LMArena Search—1171

Reasoning Gemma 4 31B IT leads

Gemma 4 31B IT: 26.4 (#119), Grok 4 Fast: 22.5 (#179)

BenchmarkGemma 4 31B ITGrok 4 Fast
Kagi LLM Benchmark63.5%66.1%
LMArena Hard Prompts14481413
DTBench82.7%82.7%
Epoch Capabilities Index142.74144.21
ARC-AGI-2—5.3%
NYT Connections (extended)70.6%—
ARC-AGI-1—48.5%
CritPt1.4%—
Chess Puzzles5%—
Thematic Generalization53%—
LMCA39.3%—
Surface Evolver Bench30.6%—
ForecastBench—60.5

Math Gemma 4 31B IT leads

Gemma 4 31B IT: 41.3 (#72), Grok 4 Fast: 36.1 (#126)

BenchmarkGemma 4 31B ITGrok 4 Fast
LMArena Math14641419
OTIS Mock AIME 2024-202573.3%—

Knowledge Gemma 4 31B IT leads

Gemma 4 31B IT: 37.9 (#141), Grok 4 Fast: 31.5 (#211)

BenchmarkGemma 4 31B ITGrok 4 Fast
Vectara Hallucination Rate7.4%19.7%
LMArena Expert14651411
GPQA Diamond75.8%—
SimpleQA Verified10.4%—

Multimodal Not comparable

Gemma 4 31B IT: 41.0 (#32), Grok 4 Fast: —

BenchmarkGemma 4 31B ITGrok 4 Fast
LMArena Vision1278—
LMArena Document1425—

Multilingual Gemma 4 31B IT leads

Gemma 4 31B IT: 54.0 (#52), Grok 4 Fast: 51.5 (#106)

BenchmarkGemma 4 31B ITGrok 4 Fast
LMArena Non-English14311397
LMArena Chinese14781458
LMArena French14361433
LMArena Russian14621387
LMArena Spanish14431414
LMArena German—1383
LMArena Japanese—1358
LMArena Korean—1359

Instruction Following Gemma 4 31B IT leads

Gemma 4 31B IT: 75.6 (#58), Grok 4 Fast: 73.4 (#116)

BenchmarkGemma 4 31B ITGrok 4 Fast
LMArena Instruction Following14331388

Long Context Grok 4 Fast leads

Gemma 4 31B IT: 44.2 (#67), Grok 4 Fast: 63.2 (#3)

BenchmarkGemma 4 31B ITGrok 4 Fast
LMArena Longer Query14461415
Fiction.LiveBench—94.4%

Writing & Preference Too close to call

Gemma 4 31B IT: 60.7 (#92), Grok 4 Fast: 60.2 (#96)

BenchmarkGemma 4 31B ITGrok 4 Fast
LMArena Text14431407
LMArena Creative Writing14161388
LMArena Multi-Turn14521414
EQ-Bench Creative Writing1368—
EQ-Bench 41120—

Frequently asked questions

Is Gemma 4 31B IT better than Grok 4 Fast?

Gemma 4 31B IT is the stronger model overall, scoring 43.2 to 39.0 on the Noometry Index.

Is Gemma 4 31B IT or Grok 4 Fast better for coding?

Gemma 4 31B IT scores higher on coding benchmarks: 41.9 versus 32.3 in the Noometry coding category.

How many benchmarks do Gemma 4 31B IT and Grok 4 Fast share?

20 benchmarks have published results for both models. Gemma 4 31B IT has 35 scored results on Noometry and Grok 4 Fast has 30.

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