Noometry

Model comparison

Gemini 3.1 Flash Lite vs Grok 4 Fast

Gemini 3.1 Flash Lite is the stronger model overall, scoring 40.8 to 39.4 on the Noometry Index.

Last verified . 24 shared benchmarks.

Gemini 3.1 Flash Lite Google

40.8

Rank #144 Confirmed

Grok 4 Fast xAI

39.4

Rank #167 Confirmed

Summary

  • They share 24 benchmarks with published results for both. Gemini 3.1 Flash Lite scores higher in 7 categories and Grok 4 Fast in 2 categories; 5 gaps are clear of the uncertainty.
  • The widest gap is in long context, where Grok 4 Fast leads 63.2 to 42.5.
  • The biggest single-benchmark swing is Vectara Hallucination Rate: 8.2% for Gemini 3.1 Flash Lite and 19.7% for Grok 4 Fast.

Side by side

Gemini 3.1 Flash LiteGrok 4 Fast
ProviderGooglexAI
Noometry Index40.839.4
Released2026-03-032025-09-19
WeightsProprietaryProprietary
Context window1.05M—
Max output66K—
Input $ / M tokens$0.25—
Output $ / M tokens$1.50—
Results tracked3830

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Category by category

Coding Gemini 3.1 Flash Lite leads

Gemini 3.1 Flash Lite: 37.8 (#188), Grok 4 Fast: 32.5 (#271)

BenchmarkGemini 3.1 Flash LiteGrok 4 Fast
LMArena WebDev12561159
WeirdML52.2%42.9%
LMArena Coding14001429
SciCode41.9%—
ALE-Bench797.73—

Agentic & Tool Use Too close to call

Gemini 3.1 Flash Lite: 30.2 (#79), Grok 4 Fast: 29.5 (#86)

BenchmarkGemini 3.1 Flash LiteGrok 4 Fast
τ²-bench Banking—15.7%
Cybench—30%
DeepResearch Bench37.3%—
LMArena Search—1171

Reasoning Too close to call

Gemini 3.1 Flash Lite: 22.9 (#186), Grok 4 Fast: 22.2 (#201)

BenchmarkGemini 3.1 Flash LiteGrok 4 Fast
Kagi LLM Benchmark67.2%66.1%
LMArena Hard Prompts14071412
DTBench76.8%82.7%
Epoch Capabilities Index144.47144.2
ForecastBench54.460.5
ARC-AGI-2—5.3%
NYT Connections (extended)8.2%—
ARC-AGI-1—48.5%
CritPt1.1%—
Chess Puzzles25%—
EnigmaEval3%—
Thematic Generalization63.3%—
LMCA35%—

Math Gemini 3.1 Flash Lite leads

Gemini 3.1 Flash Lite: 40.7 (#90), Grok 4 Fast: 38.9 (#123)

BenchmarkGemini 3.1 Flash LiteGrok 4 Fast
LMArena Math14281419
FrontierMath (Tiers 1-3)27.7%—
OTIS Mock AIME 2024-202580%—

Knowledge Gemini 3.1 Flash Lite leads

Gemini 3.1 Flash Lite: 41.9 (#104), Grok 4 Fast: 32.0 (#214)

BenchmarkGemini 3.1 Flash LiteGrok 4 Fast
Vectara Hallucination Rate8.2%19.7%
LMArena Expert13981411
GPQA Diamond81.8%—
Humanity's Last Exam8.6%—

Multimodal Not comparable

Gemini 3.1 Flash Lite: 39.4 (#60), Grok 4 Fast: —

BenchmarkGemini 3.1 Flash LiteGrok 4 Fast
LMArena Vision1240—

Multilingual Gemini 3.1 Flash Lite leads

Gemini 3.1 Flash Lite: 52.3 (#86), Grok 4 Fast: 51.3 (#111)

BenchmarkGemini 3.1 Flash LiteGrok 4 Fast
LMArena Non-English14111396
LMArena Chinese14611457
LMArena French14241431
LMArena German14291383
LMArena Japanese14131352
LMArena Korean13921357
LMArena Russian14201389
LMArena Spanish14211415

Instruction Following Too close to call

Gemini 3.1 Flash Lite: 72.7 (#131), Grok 4 Fast: 73.2 (#121)

BenchmarkGemini 3.1 Flash LiteGrok 4 Fast
LMArena Instruction Following13771387

Long Context Grok 4 Fast leads

Gemini 3.1 Flash Lite: 42.5 (#122), Grok 4 Fast: 63.2 (#3)

BenchmarkGemini 3.1 Flash LiteGrok 4 Fast
LMArena Longer Query13941415
Fiction.LiveBench—94.4%

Writing & Preference Too close to call

Gemini 3.1 Flash Lite: 60.9 (#94), Grok 4 Fast: 60.0 (#102)

BenchmarkGemini 3.1 Flash LiteGrok 4 Fast
LMArena Text14161407
LMArena Creative Writing14011387
LMArena Multi-Turn14171414

Frequently asked questions

Is Gemini 3.1 Flash Lite better than Grok 4 Fast?

Gemini 3.1 Flash Lite is the stronger model overall, scoring 40.8 to 39.4 on the Noometry Index.

Is Gemini 3.1 Flash Lite or Grok 4 Fast better for coding?

Gemini 3.1 Flash Lite scores higher on coding benchmarks: 37.8 versus 32.5 in the Noometry coding category.

How many benchmarks do Gemini 3.1 Flash Lite and Grok 4 Fast share?

24 benchmarks have published results for both models. Gemini 3.1 Flash Lite has 38 scored results on Noometry and Grok 4 Fast has 30.

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