Noometry

Model comparison

GPT-4.1 vs Grok 4 Fast

Grok 4 Fast is the stronger model overall, scoring 39.4 to 35.9 on the Noometry Index.

Last verified . 26 shared benchmarks.

GPT-4.1 OpenAI

35.9

Rank #219 Confirmed

Grok 4 Fast xAI

39.4

Rank #167 Confirmed

Summary

  • They share 26 benchmarks with published results for both. GPT-4.1 scores higher in 3 categories and Grok 4 Fast in 6 categories; 9 gaps are clear of the uncertainty.
  • The widest gap is in long context, where Grok 4 Fast leads 63.2 to 40.0.
  • The biggest single-benchmark swing is ARC-AGI-1: 5.5% for GPT-4.1 and 48.5% for Grok 4 Fast.

Side by side

GPT-4.1Grok 4 Fast
ProviderOpenAIxAI
Noometry Index35.939.4
Released2025-04-142025-09-19
WeightsProprietaryProprietary
Context window1.05M—
Max output33K—
Input $ / M tokens$2—
Output $ / M tokens$8—
Results tracked5230

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Category by category

Coding GPT-4.1 leads

GPT-4.1: 34.4 (#238), Grok 4 Fast: 32.5 (#271)

BenchmarkGPT-4.1Grok 4 Fast
WeirdML39%42.9%
LMArena Coding13911429
SWE-bench Verified48.5%—
SWE-bench Verified (bash only)39.6%—
Aider Polyglot52.4%—
LMArena WebDev—1159
CadEval42%—
ALE-Bench558.1—

Agentic & Tool Use GPT-4.1 leads

GPT-4.1: 34.7 (#43), Grok 4 Fast: 29.5 (#86)

BenchmarkGPT-4.1Grok 4 Fast
Berkeley Function Calling Leaderboard54%—
τ²-bench Banking—15.7%
Cybench—30%
LMArena Search—1171

Reasoning Grok 4 Fast leads

GPT-4.1: 11.7 (#339), Grok 4 Fast: 22.2 (#201)

BenchmarkGPT-4.1Grok 4 Fast
ARC-AGI-20.4%5.3%
Kagi LLM Benchmark52.3%66.1%
ARC-AGI-15.5%48.5%
LMArena Hard Prompts13841412
DTBench68.3%82.7%
Epoch Capabilities Index136.78144.2
ForecastBench61.560.5
SimpleBench27%—
Chess Puzzles6%—
EnigmaEval2.2%—
LMCA25.6%—

Math Grok 4 Fast leads

GPT-4.1: 22.3 (#280), Grok 4 Fast: 38.9 (#123)

BenchmarkGPT-4.1Grok 4 Fast
LMArena Math13701419
FrontierMath (Tiers 1-3)6%—
OTIS Mock AIME 2024-202538.3%—
Omni-MATH47.1%—
MATH Level 583%—
FrontierMath (Feb 2025 set)5.5%—
FrontierMath Tier 4 (v1)0%—

Knowledge GPT-4.1 leads

GPT-4.1: 37.1 (#160), Grok 4 Fast: 32.0 (#214)

BenchmarkGPT-4.1Grok 4 Fast
Vectara Hallucination Rate5.6%19.7%
LMArena Expert13641411
GPQA Diamond66.9%—
Humanity's Last Exam5.4%—
SimpleQA Verified31.1%—
MMLU-Pro81.1%—
GPQA (HELM)65.9%—

Multimodal Not comparable

GPT-4.1: 38.2 (#67), Grok 4 Fast: —

BenchmarkGPT-4.1Grok 4 Fast
LMArena Vision1211—
GeoBench72%—

Multilingual Grok 4 Fast leads

GPT-4.1: 49.4 (#133), Grok 4 Fast: 51.3 (#111)

BenchmarkGPT-4.1Grok 4 Fast
LMArena Non-English13701396
LMArena Chinese13821457
LMArena French13821431
LMArena German13811383
LMArena Japanese13191352
LMArena Korean13391357
LMArena Russian13771389
LMArena Spanish13761415

Instruction Following Grok 4 Fast leads

GPT-4.1: 71.3 (#153), Grok 4 Fast: 73.2 (#121)

BenchmarkGPT-4.1Grok 4 Fast
LMArena Instruction Following13671387
IFEval83.8%—

Long Context Grok 4 Fast leads

GPT-4.1: 40.0 (#163), Grok 4 Fast: 63.2 (#3)

BenchmarkGPT-4.1Grok 4 Fast
Fiction.LiveBench63.9%94.4%
LMArena Longer Query13851415

Writing & Preference Grok 4 Fast leads

GPT-4.1: 57.6 (#125), Grok 4 Fast: 60.0 (#102)

BenchmarkGPT-4.1Grok 4 Fast
LMArena Text13831407
LMArena Creative Writing13631387
LMArena Multi-Turn13981414
EQ-Bench Creative Writing1420—
WildBench85.4%—

Frequently asked questions

Is GPT-4.1 better than Grok 4 Fast?

Grok 4 Fast is the stronger model overall, scoring 39.4 to 35.9 on the Noometry Index.

Is GPT-4.1 or Grok 4 Fast better for coding?

GPT-4.1 scores higher on coding benchmarks: 34.4 versus 32.5 in the Noometry coding category.

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

26 benchmarks have published results for both models. GPT-4.1 has 52 scored results on Noometry and Grok 4 Fast has 30.

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