Noometry

Model comparison

Grok 4 Fast vs Mixtral 8x22B

Grok 4 Fast is the stronger model overall, scoring 39.4 to 27.1 on the Noometry Index.

Last verified . 22 shared benchmarks.

Grok 4 Fast xAI

39.4

Rank #167 Confirmed

Mixtral 8x22B Mistral AI

27.1

Rank #333 Confirmed

Summary

  • They share 22 benchmarks with published results for both. Grok 4 Fast scores higher in 9 categories and Mixtral 8x22B in 0 categories; 9 gaps are clear of the uncertainty.
  • The widest gap is in long context, where Grok 4 Fast leads 63.2 to 34.7.
  • The biggest single-benchmark swing is WeirdML: 42.9% for Grok 4 Fast and 3.2% for Mixtral 8x22B.
  • Mixtral 8x22B has downloadable open weights; the other is API-only.

Side by side

Grok 4 FastMixtral 8x22B
ProviderxAIMistral AI
Noometry Index39.427.1
Released2025-09-192024-04-17
WeightsProprietaryOpen
Context window—64K
Max output—64K
Input $ / M tokens—$2
Output $ / M tokens—$6
Results tracked3034

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Category by category

Coding Grok 4 Fast leads

Grok 4 Fast: 32.5 (#271), Mixtral 8x22B: 24.2 (#329)

BenchmarkGrok 4 FastMixtral 8x22B
WeirdML42.9%3.2%
LMArena Coding14291166
LMArena WebDev1159—
BigCodeBench Instruct—40.6%
BigCodeBench Complete—50.2%
HumanEval+—72%
MBPP+—64.3%

Agentic & Tool Use Grok 4 Fast leads

Grok 4 Fast: 29.5 (#86), Mixtral 8x22B: 23.1 (#127)

BenchmarkGrok 4 FastMixtral 8x22B
Cybench30%7.5%
τ²-bench Banking15.7%—
LMArena Search1171—

Reasoning Grok 4 Fast leads

Grok 4 Fast: 22.2 (#201), Mixtral 8x22B: 19.9 (#248)

BenchmarkGrok 4 FastMixtral 8x22B
LMArena Hard Prompts14121150
DTBench82.7%55.1%
Epoch Capabilities Index144.2122.03
ForecastBench60.556.3
ARC-AGI-25.3%—
Kagi LLM Benchmark66.1%—
ARC-AGI-148.5%—

Math Grok 4 Fast leads

Grok 4 Fast: 38.9 (#123), Mixtral 8x22B: 22.9 (#275)

BenchmarkGrok 4 FastMixtral 8x22B
LMArena Math14191184
Omni-MATH—16.3%
MATH Level 5—24.2%

Knowledge Grok 4 Fast leads

Grok 4 Fast: 32.0 (#214), Mixtral 8x22B: 15.1 (#293)

BenchmarkGrok 4 FastMixtral 8x22B
LMArena Expert14111113
GPQA Diamond—34.1%
MMLU-Pro—46%
Vectara Hallucination Rate19.7%—
GPQA (HELM)—33.4%
MMLU—77.8%

Multilingual Grok 4 Fast leads

Grok 4 Fast: 51.3 (#111), Mixtral 8x22B: 32.8 (#255)

BenchmarkGrok 4 FastMixtral 8x22B
LMArena Non-English13961128
LMArena Chinese14571116
LMArena French14311166
LMArena German13831141
LMArena Japanese13521037
LMArena Korean13571057
LMArena Russian13891158
LMArena Spanish14151151

Instruction Following Grok 4 Fast leads

Grok 4 Fast: 73.2 (#121), Mixtral 8x22B: 57.7 (#266)

BenchmarkGrok 4 FastMixtral 8x22B
LMArena Instruction Following13871147
IFEval—72.4%

Long Context Grok 4 Fast leads

Grok 4 Fast: 63.2 (#3), Mixtral 8x22B: 34.7 (#247)

BenchmarkGrok 4 FastMixtral 8x22B
LMArena Longer Query14151144
Fiction.LiveBench94.4%—

Writing & Preference Grok 4 Fast leads

Grok 4 Fast: 60.0 (#102), Mixtral 8x22B: 36.9 (#262)

BenchmarkGrok 4 FastMixtral 8x22B
LMArena Text14071162
LMArena Creative Writing13871141
LMArena Multi-Turn14141130
WildBench—71.1%

Frequently asked questions

Is Grok 4 Fast better than Mixtral 8x22B?

Grok 4 Fast is the stronger model overall, scoring 39.4 to 27.1 on the Noometry Index.

Is Grok 4 Fast or Mixtral 8x22B better for coding?

Grok 4 Fast scores higher on coding benchmarks: 32.5 versus 24.2 in the Noometry coding category.

How many benchmarks do Grok 4 Fast and Mixtral 8x22B share?

22 benchmarks have published results for both models. Grok 4 Fast has 30 scored results on Noometry and Mixtral 8x22B has 34.

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