Noometry

Model comparison

GPT-4.5 vs Grok 4.3

Grok 4.3 is the stronger model overall, scoring 43.8 to 37.2 on the Noometry Index.

Last verified . 22 shared benchmarks.

GPT-4.5 OpenAI

37.2

Rank #208 Confirmed

Grok 4.3 xAI

43.8

Rank #86 Confirmed

Summary

  • They share 22 benchmarks with published results for both. GPT-4.5 scores higher in 5 categories and Grok 4.3 in 5 categories; 7 gaps are clear of the uncertainty.
  • The widest gap is in reasoning, where Grok 4.3 leads 35.9 to 13.9.
  • The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 37.8% for GPT-4.5 and 93.3% for Grok 4.3.

Side by side

GPT-4.5Grok 4.3
ProviderOpenAIxAI
Noometry Index37.243.8
Released2025-02-272026-04-17
WeightsProprietaryProprietary
Context window—1M
Max output—30K
Input $ / M tokens—$1.25
Output $ / M tokens—$2.50
Results tracked4240

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Category by category

Coding Too close to call

GPT-4.5: 42.2 (#109), Grok 4.3: 41.6 (#121)

BenchmarkGPT-4.5Grok 4.3
WeirdML39.4%49.9%
LMArena Coding13961415
Aider Polyglot44.9%—
LMArena WebDev—1357
SciCode—47.3%
LiveBench Coding75.2%—
ALE-Bench—944.17

Agentic & Tool Use Too close to call

GPT-4.5: 27.9 (#97), Grok 4.3: 27.7 (#99)

BenchmarkGPT-4.5Grok 4.3
Cybench17.5%—
GDP.pdf—8%
LMArena Search—1165
Vending-Bench 2—35.26

Reasoning Grok 4.3 leads

GPT-4.5: 13.9 (#330), Grok 4.3: 35.9 (#68)

BenchmarkGPT-4.5Grok 4.3
LMArena Hard Prompts14031396
Epoch Capabilities Index136.74149.16
ForecastBench61.760.3
ARC-AGI-20.8%—
SimpleBench34.5%—
NYT Connections (extended)—55.2%
ARC-AGI-110.3%—
CritPt—8%
Chess Puzzles—25%
EnigmaEval3.2%—
LiveBench Reasoning71.1%—
DTBench—90.7%
LiveBench Data Analysis64.3%—
LMCA—38.3%
LiveBench69%—

Math Grok 4.3 leads

GPT-4.5: 32.6 (#211), Grok 4.3: 46.0 (#74)

BenchmarkGPT-4.5Grok 4.3
OTIS Mock AIME 2024-202537.8%93.3%
LMArena Math14121388
FrontierMath (Tiers 1-3)—42.8%
FrontierMath Tier 4—14.6%
ProofBench—11%
LiveBench Math69.3%—
MATH Level 578.6%—

Knowledge Grok 4.3 leads

GPT-4.5: 32.5 (#211), Grok 4.3: 52.5 (#62)

BenchmarkGPT-4.5Grok 4.3
GPQA Diamond68.7%88.8%
LMArena Expert13941385
Humanity's Last Exam5.4%—
SimpleQA Verified—33.2%
Confabulations13.6%—

Multimodal GPT-4.5 leads

GPT-4.5: 37.6 (#71), Grok 4.3: 31.6 (#104)

BenchmarkGPT-4.5Grok 4.3
LMArena Vision11951229
VPCT45%—
Blueprint-Bench 2—0%

Multilingual GPT-4.5 leads

GPT-4.5: 52.5 (#83), Grok 4.3: 50.5 (#120)

BenchmarkGPT-4.5Grok 4.3
LMArena Non-English14131385
LMArena Chinese14211422
LMArena French14181412
LMArena German14571395
LMArena Japanese14161379
LMArena Korean13921356
LMArena Russian14191399
LMArena Spanish—1398

Instruction Following Too close to call

GPT-4.5: 72.6 (#134), Grok 4.3: 72.1 (#140)

BenchmarkGPT-4.5Grok 4.3
LMArena Instruction Following14041366
LiveBench Instruction Following72.3%—

Long Context Grok 4.3 leads

GPT-4.5: 40.4 (#155), Grok 4.3: 42.5 (#123)

BenchmarkGPT-4.5Grok 4.3
LMArena Longer Query14061393
Fiction.LiveBench63.9%—

Writing & Preference Grok 4.3 leads

GPT-4.5: 56.9 (#134), Grok 4.3: 58.5 (#118)

BenchmarkGPT-4.5Grok 4.3
LMArena Text14171397
LMArena Creative Writing13941380
LMArena Multi-Turn14441406
Short-Story Creative Writing75.6%—
EQ-Bench Creative Writing1258—
EQ-Bench 4—1075
LiveBench Language61.5%—

Frequently asked questions

Is GPT-4.5 better than Grok 4.3?

Grok 4.3 is the stronger model overall, scoring 43.8 to 37.2 on the Noometry Index.

Is GPT-4.5 or Grok 4.3 better for coding?

They score almost the same on coding (42.2 vs 41.6); test both on your own repository before choosing.

How many benchmarks do GPT-4.5 and Grok 4.3 share?

22 benchmarks have published results for both models. GPT-4.5 has 42 scored results on Noometry and Grok 4.3 has 40.

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