Noometry

Model comparison

Grok 4 Fast vs Mistral Small

Grok 4 Fast is the stronger model overall, scoring 39.4 to 33.4 on the Noometry Index.

Last verified . 20 shared benchmarks.

Grok 4 Fast xAI

39.4

Rank #167 Confirmed

Mistral Small Mistral AI

33.4

Rank #243 Confirmed

Summary

  • They share 20 benchmarks with published results for both. Grok 4 Fast scores higher in 8 categories and Mistral Small in 1 category; 9 gaps are clear of the uncertainty.
  • The widest gap is in long context, where Grok 4 Fast leads 63.2 to 40.4.
  • The biggest single-benchmark swing is Kagi LLM Benchmark: 66.1% for Grok 4 Fast and 37.8% for Mistral Small.
  • Mistral Small has downloadable open weights; the other is API-only.

Side by side

Grok 4 FastMistral Small
ProviderxAIMistral AI
Noometry Index39.433.4
Released2025-09-192024-02-26
WeightsProprietaryOpen
Context window—262K
Max output—256K
Input $ / M tokens—$0.15
Output $ / M tokens—$0.60
Results tracked3039

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Category by category

Coding Mistral Small leads

Grok 4 Fast: 32.5 (#271), Mistral Small: 34.0 (#247)

BenchmarkGrok 4 FastMistral Small
LMArena Coding14291362
LMArena WebDev1159—
SciCode—26.5%
WeirdML42.9%—
BigCodeBench Instruct—36.1%
LiveBench Coding—36.2%
BigCodeBench Complete—46.6%
ALE-Bench—497.62

Agentic & Tool Use Grok 4 Fast leads

Grok 4 Fast: 29.5 (#86), Mistral Small: 28.1 (#93)

BenchmarkGrok 4 FastMistral Small
Berkeley Function Calling Leaderboard—37.1%
τ²-bench Banking15.7%—
Cybench30%—
LMArena Search1171—

Reasoning Grok 4 Fast leads

Grok 4 Fast: 22.2 (#201), Mistral Small: 19.8 (#250)

BenchmarkGrok 4 FastMistral Small
Kagi LLM Benchmark66.1%37.8%
LMArena Hard Prompts14121335
DTBench82.7%70.9%
ARC-AGI-25.3%—
ARC-AGI-148.5%—
CritPt—0%
LiveBench Reasoning—44.8%
LiveBench Data Analysis—53.7%
LMCA—20.6%
Epoch Capabilities Index144.2—
ForecastBench60.5—
LiveBench—44%

Math Grok 4 Fast leads

Grok 4 Fast: 38.9 (#123), Mistral Small: 16.4 (#293)

BenchmarkGrok 4 FastMistral Small
LMArena Math14191341
OTIS Mock AIME 2024-2025—5.8%
LiveBench Math—39.9%
MATH Level 5—46.8%

Knowledge Grok 4 Fast leads

Grok 4 Fast: 32.0 (#214), Mistral Small: 31.0 (#222)

BenchmarkGrok 4 FastMistral Small
Vectara Hallucination Rate19.7%5.1%
LMArena Expert14111291
GPQA Diamond—47.5%
MMLU—68.7%

Multimodal Not comparable

Grok 4 Fast: —, Mistral Small: 33.5 (#96)

BenchmarkGrok 4 FastMistral Small
LMArena Vision—1142

Multilingual Grok 4 Fast leads

Grok 4 Fast: 51.3 (#111), Mistral Small: 45.5 (#169)

BenchmarkGrok 4 FastMistral Small
LMArena Non-English13961315
LMArena Chinese14571340
LMArena French14311337
LMArena German13831340
LMArena Japanese13521275
LMArena Korean13571259
LMArena Russian13891324
LMArena Spanish14151346

Instruction Following Grok 4 Fast leads

Grok 4 Fast: 73.2 (#121), Mistral Small: 66.4 (#209)

BenchmarkGrok 4 FastMistral Small
LMArena Instruction Following13871310
LiveBench Instruction Following—63.7%

Long Context Grok 4 Fast leads

Grok 4 Fast: 63.2 (#3), Mistral Small: 40.4 (#156)

BenchmarkGrok 4 FastMistral Small
LMArena Longer Query14151327
Fiction.LiveBench94.4%—

Writing & Preference Grok 4 Fast leads

Grok 4 Fast: 60.0 (#102), Mistral Small: 52.5 (#171)

BenchmarkGrok 4 FastMistral Small
LMArena Text14071338
LMArena Creative Writing13871305
LMArena Multi-Turn14141344
LiveBench Language—30.5%

Frequently asked questions

Is Grok 4 Fast better than Mistral Small?

Grok 4 Fast is the stronger model overall, scoring 39.4 to 33.4 on the Noometry Index.

Is Grok 4 Fast or Mistral Small better for coding?

Mistral Small scores higher on coding benchmarks: 34.0 versus 32.5 in the Noometry coding category.

How many benchmarks do Grok 4 Fast and Mistral Small share?

20 benchmarks have published results for both models. Grok 4 Fast has 30 scored results on Noometry and Mistral Small has 39.

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