Noometry

Model comparison

Grok 4.1 Fast vs Llama 3-8B

Grok 4.1 Fast is the stronger model overall, scoring 41.4 to 25.5 on the Noometry Index.

Last verified . 19 shared benchmarks.

Grok 4.1 Fast xAI

41.4

Rank #136 Confirmed

Llama 3-8B Meta

25.5

Rank #344 Confirmed

Summary

  • They share 19 benchmarks with published results for both. Grok 4.1 Fast scores higher in 8 categories and Llama 3-8B in 0 categories; 8 gaps are clear of the uncertainty.
  • The widest gap is in reasoning, where Grok 4.1 Fast leads 43.4 to 14.3.
  • The biggest single-benchmark swing is DTBench: 87.7% for Grok 4.1 Fast and 43.9% for Llama 3-8B.
  • Llama 3-8B has downloadable open weights; the other is API-only.

Side by side

Grok 4.1 FastLlama 3-8B
ProviderxAIMeta
Noometry Index41.425.5
Released2025-06-272024-04-18
WeightsProprietaryOpen
Context window128K—
Max output30K—
Input $ / M tokens$0.20—
Output $ / M tokens$0.50—
Results tracked3234

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Category by category

Coding Grok 4.1 Fast leads

Grok 4.1 Fast: 34.1 (#245), Llama 3-8B: 31.0 (#289)

BenchmarkGrok 4.1 FastLlama 3-8B
LMArena Coding14111152
LMArena WebDev1242—
BigCodeBench Instruct—31.9%
BigCodeBench Complete—36.9%
ALE-Bench394.93—
HumanEval+—56.7%
MBPP+—54.8%

Agentic & Tool Use Not comparable

Grok 4.1 Fast: 36.3 (#39), Llama 3-8B: —

BenchmarkGrok 4.1 FastLlama 3-8B
Berkeley Function Calling Leaderboard69.6%—
τ²-bench Banking13.1%—
LMArena Search1171—
Vending-Bench 21,107—

Reasoning Grok 4.1 Fast leads

Grok 4.1 Fast: 43.4 (#49), Llama 3-8B: 14.3 (#326)

BenchmarkGrok 4.1 FastLlama 3-8B
LMArena Hard Prompts14071133
DTBench87.7%43.9%
ForecastBench6158.6
SimpleBench56%—
NYT Connections (extended)87.4%—
Chess Puzzles—0%
Adversarial NLI—57.3%
Epoch Capabilities Index—116.45
WinoGrande—75.7%

Math Grok 4.1 Fast leads

Grok 4.1 Fast: 31.9 (#221), Llama 3-8B: 8.8 (#323)

BenchmarkGrok 4.1 FastLlama 3-8B
LMArena Math14081151
MathArena Final-Answer Competitions60.9%—
OTIS Mock AIME 2024-2025—1.9%
ProofBench4%—
MATH Level 5—6.1%

Knowledge Grok 4.1 Fast leads

Grok 4.1 Fast: 33.1 (#207), Llama 3-8B: 7.8 (#308)

BenchmarkGrok 4.1 FastLlama 3-8B
LMArena Expert13991113
GPQA Diamond—26.1%
Vectara Hallucination Rate17.8%—
ARC (AI2) Challenge—82.8%
MMLU—68.8%
OpenBookQA—82.6%
TriviaQA—67.7%

Multimodal Not comparable

Grok 4.1 Fast: 37.0 (#76), Llama 3-8B: —

BenchmarkGrok 4.1 FastLlama 3-8B
LMArena Vision1201—

Multilingual Grok 4.1 Fast leads

Grok 4.1 Fast: 51.0 (#114), Llama 3-8B: 30.8 (#261)

BenchmarkGrok 4.1 FastLlama 3-8B
LMArena Non-English13911098
LMArena Chinese14411076
LMArena French14151159
LMArena German14041104
LMArena Japanese1349967
LMArena Korean13611004
LMArena Russian13871109
LMArena Spanish14131173

Instruction Following Grok 4.1 Fast leads

Grok 4.1 Fast: 72.7 (#133), Llama 3-8B: 58.4 (#260)

BenchmarkGrok 4.1 FastLlama 3-8B
LMArena Instruction Following13761127

Long Context Grok 4.1 Fast leads

Grok 4.1 Fast: 42.4 (#126), Llama 3-8B: 34.2 (#251)

BenchmarkGrok 4.1 FastLlama 3-8B
LMArena Longer Query13901128

Writing & Preference Grok 4.1 Fast leads

Grok 4.1 Fast: 57.2 (#131), Llama 3-8B: 37.5 (#256)

BenchmarkGrok 4.1 FastLlama 3-8B
LMArena Text14081166
LMArena Creative Writing13941150
LMArena Multi-Turn13891152
EQ-Bench Creative Writing1327—

Frequently asked questions

Is Grok 4.1 Fast better than Llama 3-8B?

Grok 4.1 Fast is the stronger model overall, scoring 41.4 to 25.5 on the Noometry Index.

Is Grok 4.1 Fast or Llama 3-8B better for coding?

Grok 4.1 Fast scores higher on coding benchmarks: 34.1 versus 31.0 in the Noometry coding category.

How many benchmarks do Grok 4.1 Fast and Llama 3-8B share?

19 benchmarks have published results for both models. Grok 4.1 Fast has 32 scored results on Noometry and Llama 3-8B has 34.

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