Noometry

Model comparison

Grok 4 Fast vs Mixtral 8x7B

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

Last verified . 20 shared benchmarks.

Grok 4 Fast xAI

39.4

Rank #167 Confirmed

Mixtral 8x7B Mistral AI

27.1

Rank #334 Confirmed

Summary

  • They share 20 benchmarks with published results for both. Grok 4 Fast scores higher in 7 categories and Mixtral 8x7B 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 33.4.
  • The biggest single-benchmark swing is DTBench: 82.7% for Grok 4 Fast and 49.6% for Mixtral 8x7B.
  • Mixtral 8x7B has downloadable open weights; the other is API-only.

Side by side

Grok 4 FastMixtral 8x7B
ProviderxAIMistral AI
Noometry Index39.427.1
Released2025-09-192023-12-11
WeightsProprietaryOpen
Context window—32K
Max output—32K
Input $ / M tokens—$0.70
Output $ / M tokens—$0.70
Results tracked3038

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Category by category

Coding Too close to call

Grok 4 Fast: 32.5 (#271), Mixtral 8x7B: 32.8 (#269)

BenchmarkGrok 4 FastMixtral 8x7B
LMArena Coding14291126
LMArena WebDev1159—
WeirdML42.9%—
HumanEval+—39.6%
MBPP+—49.7%

Agentic & Tool Use Not comparable

Grok 4 Fast: 29.5 (#86), Mixtral 8x7B: —

BenchmarkGrok 4 FastMixtral 8x7B
τ²-bench Banking15.7%—
Cybench30%—
LMArena Search1171—

Reasoning Grok 4 Fast leads

Grok 4 Fast: 22.2 (#201), Mixtral 8x7B: 18.2 (#285)

BenchmarkGrok 4 FastMixtral 8x7B
LMArena Hard Prompts14121115
DTBench82.7%49.6%
Epoch Capabilities Index144.2118.47
ForecastBench60.556.3
ARC-AGI-25.3%—
Kagi LLM Benchmark66.1%—
ARC-AGI-148.5%—
Adversarial NLI—55.2%
HellaSwag—86.7%
PIQA—83.6%
WinoGrande—77.2%

Math Grok 4 Fast leads

Grok 4 Fast: 38.9 (#123), Mixtral 8x7B: 18.8 (#289)

BenchmarkGrok 4 FastMixtral 8x7B
LMArena Math14191147
Omni-MATH—10.5%
MATH Level 5—10%
GSM8K—74.4%

Knowledge Grok 4 Fast leads

Grok 4 Fast: 32.0 (#214), Mixtral 8x7B: 11.0 (#301)

BenchmarkGrok 4 FastMixtral 8x7B
LMArena Expert14111088
GPQA Diamond—30.6%
MMLU-Pro—33.5%
Vectara Hallucination Rate19.7%—
GPQA (HELM)—29.6%
ARC (AI2) Challenge—87.3%
MMLU—70.6%
OpenBookQA—85.8%
TriviaQA—82.2%

Multilingual Grok 4 Fast leads

Grok 4 Fast: 51.3 (#111), Mixtral 8x7B: 29.6 (#266)

BenchmarkGrok 4 FastMixtral 8x7B
LMArena Non-English13961077
LMArena Chinese14571055
LMArena French14311166
LMArena German13831114
LMArena Japanese1352931
LMArena Korean1357968
LMArena Russian13891090
LMArena Spanish14151111

Instruction Following Grok 4 Fast leads

Grok 4 Fast: 73.2 (#121), Mixtral 8x7B: 51.0 (#297)

BenchmarkGrok 4 FastMixtral 8x7B
LMArena Instruction Following13871109
IFEval—57.5%

Long Context Grok 4 Fast leads

Grok 4 Fast: 63.2 (#3), Mixtral 8x7B: 33.4 (#260)

BenchmarkGrok 4 FastMixtral 8x7B
LMArena Longer Query14151103
Fiction.LiveBench94.4%—

Writing & Preference Grok 4 Fast leads

Grok 4 Fast: 60.0 (#102), Mixtral 8x7B: 34.2 (#270)

BenchmarkGrok 4 FastMixtral 8x7B
LMArena Text14071132
LMArena Creative Writing13871109
LMArena Multi-Turn14141115
WildBench—67.3%

Frequently asked questions

Is Grok 4 Fast better than Mixtral 8x7B?

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

Is Grok 4 Fast or Mixtral 8x7B better for coding?

They score almost the same on coding (32.5 vs 32.8); test both on your own repository before choosing.

How many benchmarks do Grok 4 Fast and Mixtral 8x7B share?

20 benchmarks have published results for both models. Grok 4 Fast has 30 scored results on Noometry and Mixtral 8x7B has 38.

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