Noometry

Model comparison

Grok 3 vs Grok 4.1 Fast

Grok 4.1 Fast is the stronger model overall, scoring 40.9 to 39.6 on the Noometry Index.

Last verified . 20 shared benchmarks.

Grok 3 xAI

39.6

Rank #150 Confirmed

Grok 4.1 Fast xAI

40.9

Rank #131 Confirmed

Summary

  • They share 20 benchmarks with published results for both. Grok 3 scores higher in 5 categories and Grok 4.1 Fast in 4 categories; 9 gaps are clear of the uncertainty.
  • The widest gap is in reasoning, where Grok 4.1 Fast leads 42.3 to 13.8.
  • The biggest single-benchmark swing is SimpleBench: 36.1% for Grok 3 and 56% for Grok 4.1 Fast.

Side by side

Grok 3Grok 4.1 Fast
ProviderxAIxAI
Noometry Index39.640.9
Released2025-04-092025-06-27
WeightsProprietaryProprietary
Context window—128K
Max output—30K
Input $ / M tokens—$0.20
Output $ / M tokens—$0.50
Results tracked4032

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Category by category

Coding Grok 3 leads

Grok 3: 41.5 (#113), Grok 4.1 Fast: 33.8 (#236)

BenchmarkGrok 3Grok 4.1 Fast
LMArena Coding14321411
Aider Polyglot53.3%—
LMArena WebDev—1241
WeirdML37.2%—
ALE-Bench—394.93

Agentic & Tool Use Grok 4.1 Fast leads

Grok 3: 30.2 (#69), Grok 4.1 Fast: 36.1 (#35)

BenchmarkGrok 3Grok 4.1 Fast
Berkeley Function Calling Leaderboard—69.6%
τ²-bench Banking—13.1%
BALROG29.5%—
LMArena Search—1171
Vending-Bench 2—1,107

Reasoning Grok 4.1 Fast leads

Grok 3: 13.8 (#322), Grok 4.1 Fast: 42.3 (#45)

BenchmarkGrok 3Grok 4.1 Fast
SimpleBench36.1%56%
LMArena Hard Prompts14331407
ARC-AGI-20%—
Kagi LLM Benchmark61.3%—
NYT Connections (extended)—87.4%
ARC-AGI-15.5%—
DTBench—87.7%
Epoch Capabilities Index138.34—
ForecastBench—61

Math Grok 3 leads

Grok 3: 36.2 (#122), Grok 4.1 Fast: 30.9 (#201)

BenchmarkGrok 3Grok 4.1 Fast
LMArena Math13901408
MathArena Final-Answer Competitions—60.9%
OTIS Mock AIME 2024-202555.6%—
ProofBench—4%
Omni-MATH46.4%—
MATH Level 588.7%—
FrontierMath (Feb 2025 set)3.8%—
FrontierMath Tier 4 (v1)0%—

Knowledge Grok 3 leads

Grok 3: 46.0 (#76), Grok 4.1 Fast: 32.6 (#203)

BenchmarkGrok 3Grok 4.1 Fast
Vectara Hallucination Rate5.8%17.8%
LMArena Expert14201398
GPQA Diamond75.8%—
MMLU-Pro78.8%—
Confabulations14.2%—
GPQA (HELM)65%—

Multimodal Not comparable

Grok 3: —, Grok 4.1 Fast: 36.3 (#71)

BenchmarkGrok 3Grok 4.1 Fast
LMArena Vision—1201

Multilingual Grok 3 leads

Grok 3: 52.5 (#81), Grok 4.1 Fast: 51.1 (#110)

BenchmarkGrok 3Grok 4.1 Fast
LMArena Non-English14111391
LMArena Chinese14481441
LMArena French14601416
LMArena German14311404
LMArena Japanese13891347
LMArena Korean13741361
LMArena Russian14161387
LMArena Spanish14171411

Instruction Following Grok 3 leads

Grok 3: 75.2 (#69), Grok 4.1 Fast: 72.8 (#127)

BenchmarkGrok 3Grok 4.1 Fast
LMArena Instruction Following14091376
IFEval88.4%—

Long Context Grok 4.1 Fast leads

Grok 3: 38.7 (#187), Grok 4.1 Fast: 42.4 (#121)

BenchmarkGrok 3Grok 4.1 Fast
LMArena Longer Query14391390
Fiction.LiveBench58.3%—

Writing & Preference Grok 4.1 Fast leads

Grok 3: 56.0 (#136), Grok 4.1 Fast: 57.4 (#126)

BenchmarkGrok 3Grok 4.1 Fast
LMArena Text14261408
LMArena Creative Writing14141394
EQ-Bench Creative Writing11861327
LMArena Multi-Turn14241389
Short-Story Creative Writing76.4%—
WildBench84.9%—

Frequently asked questions

Is Grok 3 better than Grok 4.1 Fast?

Grok 4.1 Fast is the stronger model overall, scoring 40.9 to 39.6 on the Noometry Index.

Is Grok 3 or Grok 4.1 Fast better for coding?

Grok 3 scores higher on coding benchmarks: 41.5 versus 33.8 in the Noometry coding category.

How many benchmarks do Grok 3 and Grok 4.1 Fast share?

20 benchmarks have published results for both models. Grok 3 has 40 scored results on Noometry and Grok 4.1 Fast has 32.

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