Noometry

Model comparison

Claude 3 Sonnet vs Grok 4 Fast

Grok 4 Fast is the stronger model overall, scoring 39.0 to 28.8 on the Noometry Index.

Last verified . 20 shared benchmarks.

Claude 3 Sonnet Anthropic

28.8

Rank #311 Confirmed

Grok 4 Fast xAI

39.0

Rank #164 Confirmed

Summary

  • They share 20 benchmarks with published results for both. Claude 3 Sonnet scores higher in 0 categories and Grok 4 Fast in 8 categories; 8 gaps are clear of the uncertainty.
  • The widest gap is in long context, where Grok 4 Fast leads 63.2 to 36.7.
  • The biggest single-benchmark swing is WeirdML: 10.2% for Claude 3 Sonnet and 42.9% for Grok 4 Fast.

Side by side

Claude 3 SonnetGrok 4 Fast
ProviderAnthropicxAI
Noometry Index28.839.0
Released2024-02-292025-09-19
WeightsProprietaryProprietary
Context window——
Max output——
Input $ / M tokens——
Output $ / M tokens——
Results tracked3030

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Category by category

Coding Grok 4 Fast leads

Claude 3 Sonnet: 29.2 (#296), Grok 4 Fast: 32.3 (#264)

BenchmarkClaude 3 SonnetGrok 4 Fast
WeirdML10.2%42.9%
LMArena Coding12231429
LMArena WebDev—1160
BigCodeBench Instruct42.7%—
BigCodeBench Complete53.8%—
HumanEval+64%—
MBPP+69.3%—

Agentic & Tool Use Not comparable

Claude 3 Sonnet: —, Grok 4 Fast: 29.3 (#80)

BenchmarkClaude 3 SonnetGrok 4 Fast
τ²-bench Banking—15.7%
Cybench—30%
LMArena Search—1171

Reasoning Grok 4 Fast leads

Claude 3 Sonnet: 19.7 (#232), Grok 4 Fast: 22.5 (#179)

BenchmarkClaude 3 SonnetGrok 4 Fast
LMArena Hard Prompts11971413
DTBench53.6%82.7%
Epoch Capabilities Index120.69144.21
ARC-AGI-2—5.3%
Kagi LLM Benchmark—66.1%
ARC-AGI-1—48.5%
ForecastBench—60.5
WinoGrande75.1%—

Math Grok 4 Fast leads

Claude 3 Sonnet: 10.0 (#305), Grok 4 Fast: 36.1 (#126)

BenchmarkClaude 3 SonnetGrok 4 Fast
LMArena Math12131419
OTIS Mock AIME 2024-20252.5%—
MATH Level 518.2%—

Knowledge Grok 4 Fast leads

Claude 3 Sonnet: 21.1 (#271), Grok 4 Fast: 31.5 (#211)

BenchmarkClaude 3 SonnetGrok 4 Fast
LMArena Expert11731411
GPQA Diamond40.6%—
Vectara Hallucination Rate—19.7%
MMLU75.9%—

Multimodal Not comparable

Claude 3 Sonnet: 24.7 (#120), Grok 4 Fast: —

BenchmarkClaude 3 SonnetGrok 4 Fast
LMArena Vision984—

Multilingual Grok 4 Fast leads

Claude 3 Sonnet: 38.0 (#229), Grok 4 Fast: 51.5 (#106)

BenchmarkClaude 3 SonnetGrok 4 Fast
LMArena Non-English12051397
LMArena Chinese11881458
LMArena French12281433
LMArena German12041383
LMArena Japanese11311358
LMArena Korean11281359
LMArena Russian12271387
LMArena Spanish12041414

Instruction Following Grok 4 Fast leads

Claude 3 Sonnet: 63.1 (#230), Grok 4 Fast: 73.4 (#116)

BenchmarkClaude 3 SonnetGrok 4 Fast
LMArena Instruction Following12001388

Long Context Grok 4 Fast leads

Claude 3 Sonnet: 36.7 (#223), Grok 4 Fast: 63.2 (#3)

BenchmarkClaude 3 SonnetGrok 4 Fast
LMArena Longer Query12111415
Fiction.LiveBench—94.4%

Writing & Preference Grok 4 Fast leads

Claude 3 Sonnet: 42.3 (#233), Grok 4 Fast: 60.2 (#96)

BenchmarkClaude 3 SonnetGrok 4 Fast
LMArena Text12181407
LMArena Creative Writing11861388
LMArena Multi-Turn12271414

Frequently asked questions

Is Claude 3 Sonnet better than Grok 4 Fast?

Grok 4 Fast is the stronger model overall, scoring 39.0 to 28.8 on the Noometry Index.

Is Claude 3 Sonnet or Grok 4 Fast better for coding?

Grok 4 Fast scores higher on coding benchmarks: 32.3 versus 29.2 in the Noometry coding category.

How many benchmarks do Claude 3 Sonnet and Grok 4 Fast share?

20 benchmarks have published results for both models. Claude 3 Sonnet has 30 scored results on Noometry and Grok 4 Fast has 30.

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