Noometry

Model comparison

Gemini 2.5 Flash-Lite vs Grok 4 Fast

Grok 4 Fast is the stronger model overall, scoring 39.4 to 37.0 on the Noometry Index.

Last verified . 23 shared benchmarks.

Gemini 2.5 Flash-Lite Google

37.0

Rank #211 Confirmed

Grok 4 Fast xAI

39.4

Rank #167 Confirmed

Summary

  • They share 23 benchmarks with published results for both. Gemini 2.5 Flash-Lite scores higher in 2 categories and Grok 4 Fast in 7 categories; 6 gaps are clear of the uncertainty.
  • The widest gap is in long context, where Grok 4 Fast leads 63.2 to 33.3.
  • The biggest single-benchmark swing is Fiction.LiveBench: 47.2% for Gemini 2.5 Flash-Lite and 94.4% for Grok 4 Fast.

Side by side

Gemini 2.5 Flash-LiteGrok 4 Fast
ProviderGooglexAI
Noometry Index37.039.4
Released2025-06-172025-09-19
WeightsProprietaryProprietary
Context window1.05M—
Max output66K—
Input $ / M tokens$0.10—
Output $ / M tokens$0.40—
Results tracked3330

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Category by category

Coding Gemini 2.5 Flash-Lite leads

Gemini 2.5 Flash-Lite: 38.5 (#173), Grok 4 Fast: 32.5 (#271)

BenchmarkGemini 2.5 Flash-LiteGrok 4 Fast
WeirdML35.2%42.9%
LMArena Coding13731429
LMArena WebDev—1159
ALE-Bench325.9—

Agentic & Tool Use Grok 4 Fast leads

Gemini 2.5 Flash-Lite: 28.0 (#96), Grok 4 Fast: 29.5 (#86)

BenchmarkGemini 2.5 Flash-LiteGrok 4 Fast
Berkeley Function Calling Leaderboard36.9%—
τ²-bench Banking—15.7%
Cybench—30%
LMArena Search—1171

Reasoning Too close to call

Gemini 2.5 Flash-Lite: 22.2 (#205), Grok 4 Fast: 22.2 (#201)

BenchmarkGemini 2.5 Flash-LiteGrok 4 Fast
Kagi LLM Benchmark40.5%66.1%
LMArena Hard Prompts13771412
DTBench62.8%82.7%
Epoch Capabilities Index133.94144.2
ARC-AGI-2—5.3%
ARC-AGI-1—48.5%
LMCA18.1%—
ForecastBench—60.5

Math Too close to call

Gemini 2.5 Flash-Lite: 38.0 (#144), Grok 4 Fast: 38.9 (#123)

BenchmarkGemini 2.5 Flash-LiteGrok 4 Fast
LMArena Math13731419
Omni-MATH48%—

Knowledge Too close to call

Gemini 2.5 Flash-Lite: 32.5 (#210), Grok 4 Fast: 32.0 (#214)

BenchmarkGemini 2.5 Flash-LiteGrok 4 Fast
Vectara Hallucination Rate3.3%19.7%
LMArena Expert13731411
MMLU-Pro53.7%—
GPQA (HELM)30.9%—

Multimodal Not comparable

Gemini 2.5 Flash-Lite: 29.1 (#114), Grok 4 Fast: —

BenchmarkGemini 2.5 Flash-LiteGrok 4 Fast
LMArena Vision1198—
VPCT30%—

Multilingual Grok 4 Fast leads

Gemini 2.5 Flash-Lite: 49.3 (#134), Grok 4 Fast: 51.3 (#111)

BenchmarkGemini 2.5 Flash-LiteGrok 4 Fast
LMArena Non-English13691396
LMArena Chinese14041457
LMArena French13881431
LMArena German13891383
LMArena Japanese13591352
LMArena Korean13601357
LMArena Russian13731389
LMArena Spanish13961415

Instruction Following Grok 4 Fast leads

Gemini 2.5 Flash-Lite: 70.0 (#168), Grok 4 Fast: 73.2 (#121)

BenchmarkGemini 2.5 Flash-LiteGrok 4 Fast
LMArena Instruction Following13671387
IFEval81%—

Long Context Grok 4 Fast leads

Gemini 2.5 Flash-Lite: 33.3 (#262), Grok 4 Fast: 63.2 (#3)

BenchmarkGemini 2.5 Flash-LiteGrok 4 Fast
Fiction.LiveBench47.2%94.4%
LMArena Longer Query13731415

Writing & Preference Grok 4 Fast leads

Gemini 2.5 Flash-Lite: 56.8 (#135), Grok 4 Fast: 60.0 (#102)

BenchmarkGemini 2.5 Flash-LiteGrok 4 Fast
LMArena Text13791407
LMArena Creative Writing13671387
LMArena Multi-Turn13661414
WildBench81.8%—

Frequently asked questions

Is Gemini 2.5 Flash-Lite better than Grok 4 Fast?

Grok 4 Fast is the stronger model overall, scoring 39.4 to 37.0 on the Noometry Index.

Is Gemini 2.5 Flash-Lite or Grok 4 Fast better for coding?

Gemini 2.5 Flash-Lite scores higher on coding benchmarks: 38.5 versus 32.5 in the Noometry coding category.

How many benchmarks do Gemini 2.5 Flash-Lite and Grok 4 Fast share?

23 benchmarks have published results for both models. Gemini 2.5 Flash-Lite has 33 scored results on Noometry and Grok 4 Fast has 30.

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