Noometry

Model comparison

Grok 4 vs Grok 4.1 Fast

Grok 4 is the stronger model overall, scoring 47.8 to 40.9 on the Noometry Index.

Last verified . 22 shared benchmarks.

Grok 4 xAI

47.8

Rank #49 Confirmed

Grok 4.1 Fast xAI

40.9

Rank #131 Confirmed

Summary

  • They share 22 benchmarks with published results for both. Grok 4 scores higher in 7 categories and Grok 4.1 Fast in 3 categories; 9 gaps are clear of the uncertainty.
  • The widest gap is in knowledge, where Grok 4 leads 53.7 to 32.6.
  • The biggest single-benchmark swing is Berkeley Function Calling Leaderboard: 63% for Grok 4 and 69.6% for Grok 4.1 Fast.

Side by side

Grok 4Grok 4.1 Fast
ProviderxAIxAI
Noometry Index47.840.9
Released2025-07-092025-06-27
WeightsProprietaryProprietary
Context window—128K
Max output—30K
Input $ / M tokens—$0.20
Output $ / M tokens—$0.50
Results tracked4832

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Category by category

Coding Grok 4 leads

Grok 4: 49.9 (#44), Grok 4.1 Fast: 33.8 (#236)

BenchmarkGrok 4Grok 4.1 Fast
LMArena Coding14081411
Aider Polyglot79.6%—
LMArena WebDev—1241
WeirdML45.7%—
ALE-Bench—394.93

Agentic & Tool Use Grok 4.1 Fast leads

Grok 4: 32.1 (#62), Grok 4.1 Fast: 36.1 (#35)

BenchmarkGrok 4Grok 4.1 Fast
Berkeley Function Calling Leaderboard63%69.6%
LMArena Search11421171
Terminal-Bench27.2%—
GDPval21.1%—
τ²-bench Banking—13.1%
Cybench43%—
DeepResearch Bench47.3%—
BALROG43.6%—
METR Time Horizons66.6%—
Vending-Bench 2—1,107

Reasoning Grok 4.1 Fast leads

Grok 4: 36.9 (#59), Grok 4.1 Fast: 42.3 (#45)

BenchmarkGrok 4Grok 4.1 Fast
SimpleBench60.5%56%
LMArena Hard Prompts14091407
ForecastBench60.961
ARC-AGI-216%—
Kagi LLM Benchmark73.6%—
NYT Connections (extended)—87.4%
ARC-AGI-166.7%—
Chess Puzzles28%—
DTBench—87.7%
Epoch Capabilities Index146.46—

Math Grok 4 leads

Grok 4: 46.5 (#58), Grok 4.1 Fast: 30.9 (#201)

BenchmarkGrok 4Grok 4.1 Fast
LMArena Math14221408
MathArena Final-Answer Competitions—60.9%
OTIS Mock AIME 2024-202584%—
ProofBench—4%
Omni-MATH60.3%—
FrontierMath (Feb 2025 set)19.7%—
FrontierMath Tier 4 (v1)2.1%—

Knowledge Grok 4 leads

Grok 4: 53.7 (#50), Grok 4.1 Fast: 32.6 (#203)

BenchmarkGrok 4Grok 4.1 Fast
LMArena Expert14171398
GPQA Diamond87%—
MMLU-Pro85.1%—
Confabulations12.4%—
Vectara Hallucination Rate—17.8%
GPQA (HELM)72.7%—

Multimodal Grok 4.1 Fast leads

Grok 4: 33.1 (#89), Grok 4.1 Fast: 36.3 (#71)

BenchmarkGrok 4Grok 4.1 Fast
LMArena Vision12111201
GeoBench45%—

Multilingual Too close to call

Grok 4: 52.0 (#98), Grok 4.1 Fast: 51.1 (#110)

BenchmarkGrok 4Grok 4.1 Fast
LMArena Non-English14031391
LMArena Chinese14281441
LMArena French14181416
LMArena German14291404
LMArena Japanese13961347
LMArena Korean13761361
LMArena Russian14091387
LMArena Spanish14191411

Instruction Following Grok 4 leads

Grok 4: 79.4 (#4), Grok 4.1 Fast: 72.8 (#127)

BenchmarkGrok 4Grok 4.1 Fast
LMArena Instruction Following13871376
IFEval94.9%—

Long Context Grok 4 leads

Grok 4: 63.1 (#4), Grok 4.1 Fast: 42.4 (#121)

BenchmarkGrok 4Grok 4.1 Fast
LMArena Longer Query14091390
Fiction.LiveBench94.4%—

Writing & Preference Grok 4 leads

Grok 4: 58.7 (#111), Grok 4.1 Fast: 57.4 (#126)

BenchmarkGrok 4Grok 4.1 Fast
LMArena Text14121408
LMArena Creative Writing13971394
LMArena Multi-Turn14161389
Short-Story Creative Writing76.9%—
EQ-Bench Creative Writing—1327
WildBench79.7%—

Frequently asked questions

Is Grok 4 better than Grok 4.1 Fast?

Grok 4 is the stronger model overall, scoring 47.8 to 40.9 on the Noometry Index.

Is Grok 4 or Grok 4.1 Fast better for coding?

Grok 4 scores higher on coding benchmarks: 49.9 versus 33.8 in the Noometry coding category.

How many benchmarks do Grok 4 and Grok 4.1 Fast share?

22 benchmarks have published results for both models. Grok 4 has 48 scored results on Noometry and Grok 4.1 Fast has 32.

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