Noometry

Model comparison

GPT-4.5 vs Grok 4.20 Multi-Agent

Grok 4.20 Multi-Agent is the stronger model overall, scoring 46.2 to 37.2 on the Noometry Index.

Last verified . 17 shared benchmarks.

GPT-4.5 OpenAI

37.2

Rank #208 Confirmed

Grok 4.20 Multi-Agent xAI

46.2

Rank #65 Confirmed

Summary

  • They share 17 benchmarks with published results for both. GPT-4.5 scores higher in 0 categories and Grok 4.20 Multi-Agent in 9 categories; 8 gaps are clear of the uncertainty.
  • The widest gap is in reasoning, where Grok 4.20 Multi-Agent leads 43.9 to 13.9.

Side by side

GPT-4.5Grok 4.20 Multi-Agent
ProviderOpenAIxAI
Noometry Index37.246.2
Released2025-02-272026-03-09
WeightsProprietaryProprietary
Context window—1M
Max output—30K
Input $ / M tokens—$1.25
Output $ / M tokens—$2.50
Results tracked4220

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Category by category

Coding Too close to call

GPT-4.5: 42.2 (#109), Grok 4.20 Multi-Agent: 43.0 (#92)

BenchmarkGPT-4.5Grok 4.20 Multi-Agent
LMArena Coding13961457
Aider Polyglot44.9%—
WeirdML39.4%—
LiveBench Coding75.2%—

Agentic & Tool Use Not comparable

GPT-4.5: 27.9 (#97), Grok 4.20 Multi-Agent: —

BenchmarkGPT-4.5Grok 4.20 Multi-Agent
Cybench17.5%—
LMArena Search—1204

Reasoning Grok 4.20 Multi-Agent leads

GPT-4.5: 13.9 (#330), Grok 4.20 Multi-Agent: 43.9 (#48)

BenchmarkGPT-4.5Grok 4.20 Multi-Agent
LMArena Hard Prompts14031448
ARC-AGI-20.8%—
SimpleBench34.5%—
NYT Connections (extended)—89.6%
ARC-AGI-110.3%—
EnigmaEval3.2%—
LiveBench Reasoning71.1%—
LiveBench Data Analysis64.3%—
Epoch Capabilities Index136.74—
ForecastBench61.7—
LiveBench69%—

Math Grok 4.20 Multi-Agent leads

GPT-4.5: 32.6 (#211), Grok 4.20 Multi-Agent: 39.4 (#104)

BenchmarkGPT-4.5Grok 4.20 Multi-Agent
LMArena Math14121442
OTIS Mock AIME 2024-202537.8%—
LiveBench Math69.3%—
MATH Level 578.6%—

Knowledge Grok 4.20 Multi-Agent leads

GPT-4.5: 32.5 (#211), Grok 4.20 Multi-Agent: 40.4 (#119)

BenchmarkGPT-4.5Grok 4.20 Multi-Agent
LMArena Expert13941445
GPQA Diamond68.7%—
Humanity's Last Exam5.4%—
Confabulations13.6%—

Multimodal Grok 4.20 Multi-Agent leads

GPT-4.5: 37.6 (#71), Grok 4.20 Multi-Agent: 40.5 (#48)

BenchmarkGPT-4.5Grok 4.20 Multi-Agent
LMArena Vision11951259
VPCT45%—

Multilingual Grok 4.20 Multi-Agent leads

GPT-4.5: 52.5 (#83), Grok 4.20 Multi-Agent: 54.4 (#43)

BenchmarkGPT-4.5Grok 4.20 Multi-Agent
LMArena Non-English14131440
LMArena Chinese14211475
LMArena French14181466
LMArena German14571456
LMArena Japanese14161405
LMArena Korean13921416
LMArena Russian14191457
LMArena Spanish—1447

Instruction Following Grok 4.20 Multi-Agent leads

GPT-4.5: 72.6 (#134), Grok 4.20 Multi-Agent: 74.8 (#84)

BenchmarkGPT-4.5Grok 4.20 Multi-Agent
LMArena Instruction Following14041420
LiveBench Instruction Following72.3%—

Long Context Grok 4.20 Multi-Agent leads

GPT-4.5: 40.4 (#155), Grok 4.20 Multi-Agent: 43.7 (#88)

BenchmarkGPT-4.5Grok 4.20 Multi-Agent
LMArena Longer Query14061431
Fiction.LiveBench63.9%—

Writing & Preference Grok 4.20 Multi-Agent leads

GPT-4.5: 56.9 (#134), Grok 4.20 Multi-Agent: 64.0 (#59)

BenchmarkGPT-4.5Grok 4.20 Multi-Agent
LMArena Text14171450
LMArena Creative Writing13941436
LMArena Multi-Turn14441452
Short-Story Creative Writing75.6%—
EQ-Bench Creative Writing1258—
LiveBench Language61.5%—

Frequently asked questions

Is GPT-4.5 better than Grok 4.20 Multi-Agent?

Grok 4.20 Multi-Agent is the stronger model overall, scoring 46.2 to 37.2 on the Noometry Index.

Is GPT-4.5 or Grok 4.20 Multi-Agent better for coding?

They score almost the same on coding (42.2 vs 43.0); test both on your own repository before choosing.

How many benchmarks do GPT-4.5 and Grok 4.20 Multi-Agent share?

17 benchmarks have published results for both models. GPT-4.5 has 42 scored results on Noometry and Grok 4.20 Multi-Agent has 20.

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