Noometry

Model comparison

Claude Opus 5.5 vs Grok 4.1

Claude Opus 5.5 is the stronger model overall, scoring 68.6 to 41.5 on the Noometry Index.

Last verified . 15 shared benchmarks.

Claude Opus 5.5 Anthropic

68.6

Rank #3 Confirmed

Grok 4.1 xAI

41.5

Rank #134 Confirmed

Summary

  • They share 15 benchmarks with published results for both. Claude Opus 5.5 scores higher in 9 categories and Grok 4.1 in 0 categories; 9 gaps are clear of the uncertainty.
  • The widest gap is in math, where Claude Opus 5.5 leads 91.8 to 38.9.

Side by side

Claude Opus 5.5Grok 4.1
ProviderAnthropicxAI
Noometry Index68.641.5
Released2026-09-222025-11-17
WeightsProprietaryProprietary
Context window1M—
Max output128K—
Input $ / M tokens$4—
Output $ / M tokens$20—
Results tracked4419

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Category by category

Coding Claude Opus 5.5 leads

Claude Opus 5.5: 71.9 (#3), Grok 4.1: 33.7 (#253)

BenchmarkClaude Opus 5.5Grok 4.1
LMArena WebDev18131214
LMArena Coding15471445
FrontierCode54.6%—
CursorBench57.8%—
FrontierSWE62.3%—
SciCode66.9%—
MirrorCode77.4%—
ALE-Bench2,147—

Agentic & Tool Use Claude Opus 5.5 leads

Claude Opus 5.5: 45.3 (#15), Grok 4.1: 34.1 (#49)

BenchmarkClaude Opus 5.5Grok 4.1
APEX-Agents73.5%—
Cybench—39%
GDP.pdf30.6%—
Vending-Bench 29,235—

Reasoning Claude Opus 5.5 leads

Claude Opus 5.5: 80.2 (#3), Grok 4.1: 29.5 (#91)

BenchmarkClaude Opus 5.5Grok 4.1
LMArena Hard Prompts15351435
ARC-AGI-293.3%—
NYT Connections (extended)88.5%—
ARC-AGI-198.5%—
CritPt31.7%—
EBR-Bench71.4%—
Mystery Game Puzzles71%—
DTBench98.9%—
LMCA68.2%—
Epoch Capabilities Index167.33—

Math Claude Opus 5.5 leads

Claude Opus 5.5: 91.8 (#3), Grok 4.1: 38.9 (#120)

BenchmarkClaude Opus 5.5Grok 4.1
LMArena Math15061422
FrontierMath (Tiers 1-3)91.2%—
FrontierMath Tier 495%—
OTIS Mock AIME 2024-2025100%—
ProofBench100%—
FrontierMath Erdős2.9%—

Knowledge Claude Opus 5.5 leads

Claude Opus 5.5: 66.4 (#10), Grok 4.1: 39.5 (#133)

BenchmarkClaude Opus 5.5Grok 4.1
LMArena Expert15471417
GPQA Diamond90.6%—
SimpleQA Verified72.2%—

Multimodal Not comparable

Claude Opus 5.5: 57.8 (#1), Grok 4.1: —

BenchmarkClaude Opus 5.5Grok 4.1
LMArena Vision1321—
Blueprint-Bench 251.2%—
Furniture Assembly83.3%—

Multilingual Claude Opus 5.5 leads

Claude Opus 5.5: 59.1 (#2), Grok 4.1: 53.4 (#68)

BenchmarkClaude Opus 5.5Grok 4.1
LMArena Non-English15071425
LMArena Chinese15881465
LMArena French15141448
LMArena Russian15201434
LMArena Spanish15071438
LMArena German—1446
LMArena Japanese—1397
LMArena Korean—1407

Instruction Following Claude Opus 5.5 leads

Claude Opus 5.5: 80.0 (#3), Grok 4.1: 73.8 (#111)

BenchmarkClaude Opus 5.5Grok 4.1
LMArena Instruction Following15371400

Long Context Claude Opus 5.5 leads

Claude Opus 5.5: 47.1 (#19), Grok 4.1: 43.2 (#100)

BenchmarkClaude Opus 5.5Grok 4.1
LMArena Longer Query15321416

Writing & Preference Claude Opus 5.5 leads

Claude Opus 5.5: 78.2 (#3), Grok 4.1: 62.4 (#75)

BenchmarkClaude Opus 5.5Grok 4.1
LMArena Text15151437
LMArena Creative Writing15331411
LMArena Multi-Turn14991437
EQ-Bench Creative Writing2050—

Frequently asked questions

Is Claude Opus 5.5 better than Grok 4.1?

Claude Opus 5.5 is the stronger model overall, scoring 68.6 to 41.5 on the Noometry Index.

Is Claude Opus 5.5 or Grok 4.1 better for coding?

Claude Opus 5.5 scores higher on coding benchmarks: 71.9 versus 33.7 in the Noometry coding category.

How many benchmarks do Claude Opus 5.5 and Grok 4.1 share?

15 benchmarks have published results for both models. Claude Opus 5.5 has 44 scored results on Noometry and Grok 4.1 has 19.

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