Noometry

Model comparison

Claude 3 Sonnet vs Grok 4.3

Grok 4.3 is the stronger model overall, scoring 43.8 to 29.0 on the Noometry Index.

Last verified . 23 shared benchmarks.

Claude 3 Sonnet Anthropic

29.0

Rank #319 Confirmed

Grok 4.3 xAI

43.8

Rank #86 Confirmed

Summary

  • They share 23 benchmarks with published results for both. Claude 3 Sonnet scores higher in 0 categories and Grok 4.3 in 9 categories; 9 gaps are clear of the uncertainty.
  • The widest gap is in math, where Grok 4.3 leads 46.0 to 10.7.
  • The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 2.5% for Claude 3 Sonnet and 93.3% for Grok 4.3.

Side by side

Claude 3 SonnetGrok 4.3
ProviderAnthropicxAI
Noometry Index29.043.8
Released2024-02-292026-04-17
WeightsProprietaryProprietary
Context window—1M
Max output—30K
Input $ / M tokens—$1.25
Output $ / M tokens—$2.50
Results tracked3040

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Category by category

Coding Grok 4.3 leads

Claude 3 Sonnet: 29.6 (#302), Grok 4.3: 41.6 (#121)

BenchmarkClaude 3 SonnetGrok 4.3
WeirdML10.2%49.9%
LMArena Coding12231415
LMArena WebDev—1357
SciCode—47.3%
BigCodeBench Instruct42.7%—
BigCodeBench Complete53.8%—
ALE-Bench—944.17
HumanEval+64%—
MBPP+69.3%—

Agentic & Tool Use Not comparable

Claude 3 Sonnet: —, Grok 4.3: 27.7 (#99)

BenchmarkClaude 3 SonnetGrok 4.3
GDP.pdf—8%
LMArena Search—1165
Vending-Bench 2—35.26

Reasoning Grok 4.3 leads

Claude 3 Sonnet: 20.5 (#237), Grok 4.3: 35.9 (#68)

BenchmarkClaude 3 SonnetGrok 4.3
LMArena Hard Prompts11971396
DTBench53.6%90.7%
Epoch Capabilities Index120.7149.16
NYT Connections (extended)—55.2%
CritPt—8%
Chess Puzzles—25%
LMCA—38.3%
ForecastBench—60.3
WinoGrande75.1%—

Math Grok 4.3 leads

Claude 3 Sonnet: 10.7 (#310), Grok 4.3: 46.0 (#74)

BenchmarkClaude 3 SonnetGrok 4.3
OTIS Mock AIME 2024-20252.5%93.3%
LMArena Math12131388
FrontierMath (Tiers 1-3)—42.8%
FrontierMath Tier 4—14.6%
ProofBench—11%
MATH Level 518.2%—

Knowledge Grok 4.3 leads

Claude 3 Sonnet: 21.1 (#276), Grok 4.3: 52.5 (#62)

BenchmarkClaude 3 SonnetGrok 4.3
GPQA Diamond40.6%88.8%
LMArena Expert11731385
SimpleQA Verified—33.2%
MMLU75.9%—

Multimodal Grok 4.3 leads

Claude 3 Sonnet: 25.2 (#125), Grok 4.3: 31.6 (#104)

BenchmarkClaude 3 SonnetGrok 4.3
LMArena Vision9841229
Blueprint-Bench 2—0%

Multilingual Grok 4.3 leads

Claude 3 Sonnet: 37.8 (#234), Grok 4.3: 50.5 (#120)

BenchmarkClaude 3 SonnetGrok 4.3
LMArena Non-English12051385
LMArena Chinese11891422
LMArena French12291412
LMArena German12041395
LMArena Japanese11311379
LMArena Korean11281356
LMArena Russian12271399
LMArena Spanish12041398

Instruction Following Grok 4.3 leads

Claude 3 Sonnet: 62.8 (#235), Grok 4.3: 72.1 (#140)

BenchmarkClaude 3 SonnetGrok 4.3
LMArena Instruction Following11991366

Long Context Grok 4.3 leads

Claude 3 Sonnet: 36.7 (#228), Grok 4.3: 42.5 (#123)

BenchmarkClaude 3 SonnetGrok 4.3
LMArena Longer Query12111393

Writing & Preference Grok 4.3 leads

Claude 3 Sonnet: 42.1 (#238), Grok 4.3: 58.5 (#118)

BenchmarkClaude 3 SonnetGrok 4.3
LMArena Text12181397
LMArena Creative Writing11861380
LMArena Multi-Turn12271406
EQ-Bench 4—1075

Frequently asked questions

Is Claude 3 Sonnet better than Grok 4.3?

Grok 4.3 is the stronger model overall, scoring 43.8 to 29.0 on the Noometry Index.

Is Claude 3 Sonnet or Grok 4.3 better for coding?

Grok 4.3 scores higher on coding benchmarks: 41.6 versus 29.6 in the Noometry coding category.

How many benchmarks do Claude 3 Sonnet and Grok 4.3 share?

23 benchmarks have published results for both models. Claude 3 Sonnet has 30 scored results on Noometry and Grok 4.3 has 40.

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