Noometry

Model comparison

GPT-4.5 vs Grok 4.1 Fast

Grok 4.1 Fast is the stronger model overall, scoring 40.9 to 36.9 on the Noometry Index.

Last verified . 20 shared benchmarks.

GPT-4.5 OpenAI

36.9

Rank #200 Confirmed

Grok 4.1 Fast xAI

40.9

Rank #131 Confirmed

Summary

  • They share 20 benchmarks with published results for both. GPT-4.5 scores higher in 4 categories and Grok 4.1 Fast in 6 categories; 5 gaps are clear of the uncertainty.
  • The widest gap is in reasoning, where Grok 4.1 Fast leads 42.3 to 14.1.
  • The biggest single-benchmark swing is SimpleBench: 34.5% for GPT-4.5 and 56% for Grok 4.1 Fast.

Side by side

GPT-4.5Grok 4.1 Fast
ProviderOpenAIxAI
Noometry Index36.940.9
Released2025-02-272025-06-27
WeightsProprietaryProprietary
Context window—128K
Max output—30K
Input $ / M tokens—$0.20
Output $ / M tokens—$0.50
Results tracked4232

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Category by category

Coding GPT-4.5 leads

GPT-4.5: 41.8 (#102), Grok 4.1 Fast: 33.8 (#236)

BenchmarkGPT-4.5Grok 4.1 Fast
LMArena Coding13971411
Aider Polyglot44.9%—
LMArena WebDev—1241
WeirdML39.4%—
LiveBench Coding75.2%—
ALE-Bench—394.93

Agentic & Tool Use Grok 4.1 Fast leads

GPT-4.5: 27.6 (#92), Grok 4.1 Fast: 36.1 (#35)

BenchmarkGPT-4.5Grok 4.1 Fast
Berkeley Function Calling Leaderboard—69.6%
τ²-bench Banking—13.1%
Cybench17.5%—
LMArena Search—1171
Vending-Bench 2—1,107

Reasoning Grok 4.1 Fast leads

GPT-4.5: 14.1 (#320), Grok 4.1 Fast: 42.3 (#45)

BenchmarkGPT-4.5Grok 4.1 Fast
SimpleBench34.5%56%
LMArena Hard Prompts14041407
ForecastBench61.761
ARC-AGI-20.8%—
NYT Connections (extended)—87.4%
ARC-AGI-110.3%—
EnigmaEval3.2%—
LiveBench Reasoning71.1%—
DTBench—87.7%
LiveBench Data Analysis64.3%—
Epoch Capabilities Index136.74—
LiveBench69%—

Math Too close to call

GPT-4.5: 31.0 (#200), Grok 4.1 Fast: 30.9 (#201)

BenchmarkGPT-4.5Grok 4.1 Fast
LMArena Math14121408
MathArena Final-Answer Competitions—60.9%
OTIS Mock AIME 2024-202537.8%—
ProofBench—4%
LiveBench Math69.3%—
MATH Level 578.6%—

Knowledge Too close to call

GPT-4.5: 32.4 (#205), Grok 4.1 Fast: 32.6 (#203)

BenchmarkGPT-4.5Grok 4.1 Fast
LMArena Expert13941398
GPQA Diamond68.7%—
Humanity's Last Exam5.4%—
Confabulations13.6%—
Vectara Hallucination Rate—17.8%

Multimodal Too close to call

GPT-4.5: 37.0 (#68), Grok 4.1 Fast: 36.3 (#71)

BenchmarkGPT-4.5Grok 4.1 Fast
LMArena Vision11951201
VPCT45%—

Multilingual GPT-4.5 leads

GPT-4.5: 52.7 (#78), Grok 4.1 Fast: 51.1 (#110)

BenchmarkGPT-4.5Grok 4.1 Fast
LMArena Non-English14131391
LMArena Chinese14211441
LMArena French14171416
LMArena German14571404
LMArena Japanese14161347
LMArena Korean13921361
LMArena Russian14191387
LMArena Spanish—1411

Instruction Following Too close to call

GPT-4.5: 72.8 (#129), Grok 4.1 Fast: 72.8 (#127)

BenchmarkGPT-4.5Grok 4.1 Fast
LMArena Instruction Following14041376
LiveBench Instruction Following72.3%—

Long Context Grok 4.1 Fast leads

GPT-4.5: 40.4 (#150), Grok 4.1 Fast: 42.4 (#121)

BenchmarkGPT-4.5Grok 4.1 Fast
LMArena Longer Query14061390
Fiction.LiveBench63.9%—

Writing & Preference Too close to call

GPT-4.5: 57.1 (#129), Grok 4.1 Fast: 57.4 (#126)

BenchmarkGPT-4.5Grok 4.1 Fast
LMArena Text14171408
LMArena Creative Writing13941394
EQ-Bench Creative Writing12581327
LMArena Multi-Turn14441389
Short-Story Creative Writing75.6%—
LiveBench Language61.5%—

Frequently asked questions

Is GPT-4.5 better than Grok 4.1 Fast?

Grok 4.1 Fast is the stronger model overall, scoring 40.9 to 36.9 on the Noometry Index.

Is GPT-4.5 or Grok 4.1 Fast better for coding?

GPT-4.5 scores higher on coding benchmarks: 41.8 versus 33.8 in the Noometry coding category.

How many benchmarks do GPT-4.5 and Grok 4.1 Fast share?

20 benchmarks have published results for both models. GPT-4.5 has 42 scored results on Noometry and Grok 4.1 Fast has 32.

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