Noometry

Model comparison

Claude Sonnet 5.5 vs Grok-3 mini

Claude Sonnet 5.5 is the stronger model overall, scoring 61.9 to 41.2 on the Noometry Index.

Last verified . 15 shared benchmarks.

Claude Sonnet 5.5 Anthropic

61.9

Rank #10 Confirmed

Grok-3 mini xAI

41.2

Rank #141 Confirmed

Summary

  • They share 15 benchmarks with published results for both. Claude Sonnet 5.5 scores higher in 7 categories and Grok-3 mini in 1 category; 7 gaps are clear of the uncertainty.
  • The widest gap is in math, where Claude Sonnet 5.5 leads 87.9 to 42.1.
  • The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 100% for Claude Sonnet 5.5 and 77.8% for Grok-3 mini.

Side by side

Claude Sonnet 5.5Grok-3 mini
ProviderAnthropicxAI
Noometry Index61.941.2
Released2026-09-282025-04-09
WeightsProprietaryProprietary
Context window1M—
Max output128K—
Input $ / M tokens$2—
Output $ / M tokens$10—
Results tracked3235

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Category by category

Coding Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 67.3 (#6), Grok-3 mini: 40.8 (#131)

BenchmarkClaude Sonnet 5.5Grok-3 mini
LMArena Coding15131379
FrontierCode52.1%—
Aider Polyglot—49.3%
CursorBench55.5%—
LMArena WebDev1774—
FrontierSWE61.9%—
SciCode61%—
WeirdML—42.6%
ALE-Bench1,819—

Agentic & Tool Use Not comparable

Claude Sonnet 5.5: 45.0 (#16), Grok-3 mini: —

BenchmarkClaude Sonnet 5.5Grok-3 mini
APEX-Agents75.5%—

Reasoning Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 54.0 (#28), Grok-3 mini: 13.6 (#334)

BenchmarkClaude Sonnet 5.5Grok-3 mini
LMArena Hard Prompts14951375
Epoch Capabilities Index165.03140.35
ARC-AGI-2—0.4%
Kagi LLM Benchmark—61.3%
NYT Connections (extended)80.5%—
ARC-AGI-1—16.5%
CritPt31.4%—
Mystery Game Puzzles65%—

Math Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 87.9 (#6), Grok-3 mini: 42.1 (#85)

BenchmarkClaude Sonnet 5.5Grok-3 mini
OTIS Mock AIME 2024-2025100%77.8%
LMArena Math15101386
FrontierMath (Tiers 1-3)88.8%—
FrontierMath Tier 480.5%—
ProofBench100%—
Omni-MATH—31.8%
MATH Level 5—90.9%
FrontierMath (Feb 2025 set)—5.9%
FrontierMath Erdős2.9%—

Knowledge Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 66.0 (#12), Grok-3 mini: 46.4 (#81)

BenchmarkClaude Sonnet 5.5Grok-3 mini
GPQA Diamond95.6%76.3%
LMArena Expert15401395
SimpleQA Verified46.5%—
MMLU-Pro—79.9%
Confabulations—10.8%
GPQA (HELM)—67.5%

Multimodal Not comparable

Claude Sonnet 5.5: 51.5 (#6), Grok-3 mini: —

BenchmarkClaude Sonnet 5.5Grok-3 mini
LMArena Vision1289—
Furniture Assembly75%—

Multilingual Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 55.3 (#30), Grok-3 mini: 48.1 (#145)

BenchmarkClaude Sonnet 5.5Grok-3 mini
LMArena Non-English14521352
LMArena Chinese15221387
LMArena Russian14511353
LMArena French—1357
LMArena German—1349
LMArena Japanese—1342
LMArena Korean—1335
LMArena Spanish—1381

Instruction Following Too close to call

Claude Sonnet 5.5: 78.3 (#11), Grok-3 mini: 78.5 (#9)

BenchmarkClaude Sonnet 5.5Grok-3 mini
LMArena Instruction Following14951357
IFEval—95.1%

Long Context Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 45.9 (#28), Grok-3 mini: 41.0 (#147)

BenchmarkClaude Sonnet 5.5Grok-3 mini
LMArena Longer Query14981372
Fiction.LiveBench—66.7%

Writing & Preference Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 66.0 (#40), Grok-3 mini: 52.5 (#169)

BenchmarkClaude Sonnet 5.5Grok-3 mini
LMArena Text14711370
LMArena Creative Writing14651342
LMArena Multi-Turn14741355
Short-Story Creative Writing—73.5%
WildBench—65.1%

Frequently asked questions

Is Claude Sonnet 5.5 better than Grok-3 mini?

Claude Sonnet 5.5 is the stronger model overall, scoring 61.9 to 41.2 on the Noometry Index.

Is Claude Sonnet 5.5 or Grok-3 mini better for coding?

Claude Sonnet 5.5 scores higher on coding benchmarks: 67.3 versus 40.8 in the Noometry coding category.

How many benchmarks do Claude Sonnet 5.5 and Grok-3 mini share?

15 benchmarks have published results for both models. Claude Sonnet 5.5 has 32 scored results on Noometry and Grok-3 mini has 35.

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