Noometry

Model comparison

Claude Sonnet 5.5 vs Muse Spark

Claude Sonnet 5.5 is the stronger model overall, scoring 61.9 to 50.6 on the Noometry Index.

Last verified . 19 shared benchmarks.

Claude Sonnet 5.5 Anthropic

61.9

Rank #10 Confirmed

Muse Spark Meta

50.6

Rank #46 Confirmed

Summary

  • They share 19 benchmarks with published results for both. Claude Sonnet 5.5 scores higher in 7 categories and Muse Spark in 2 categories; 6 gaps are clear of the uncertainty.
  • The widest gap is in math, where Claude Sonnet 5.5 leads 87.9 to 47.8.
  • The biggest single-benchmark swing is ProofBench: 100% for Claude Sonnet 5.5 and 17% for Muse Spark.

Side by side

Claude Sonnet 5.5Muse Spark
ProviderAnthropicMeta
Noometry Index61.950.6
Released2026-09-282026-04-08
WeightsProprietaryProprietary
Context window1M—
Max output128K—
Input $ / M tokens$2—
Output $ / M tokens$10—
Results tracked3227

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Category by category

Coding Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 67.3 (#6), Muse Spark: 46.2 (#69)

BenchmarkClaude Sonnet 5.5Muse Spark
SciCode61%51.5%
LMArena Coding15131481
FrontierCode52.1%—
CursorBench55.5%—
LMArena WebDev1774—
FrontierSWE61.9%—
ALE-Bench1,819—

Agentic & Tool Use Not comparable

Claude Sonnet 5.5: 45.0 (#16), Muse Spark: —

BenchmarkClaude Sonnet 5.5Muse Spark
APEX-Agents75.5%—

Reasoning Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 54.0 (#28), Muse Spark: 35.9 (#67)

BenchmarkClaude Sonnet 5.5Muse Spark
CritPt31.4%11.3%
LMArena Hard Prompts14951474
Epoch Capabilities Index165.03152.04
NYT Connections (extended)80.5%—
Mystery Game Puzzles65%—

Math Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 87.9 (#6), Muse Spark: 47.8 (#66)

BenchmarkClaude Sonnet 5.5Muse Spark
OTIS Mock AIME 2024-2025100%88.9%
ProofBench100%17%
LMArena Math15101455
FrontierMath (Tiers 1-3)88.8%—
FrontierMath Tier 480.5%—
FrontierMath (Feb 2025 set)—39%
FrontierMath Erdős2.9%—
FrontierMath Tier 4 (v1)—14.6%

Knowledge Too close to call

Claude Sonnet 5.5: 66.0 (#12), Muse Spark: 65.7 (#13)

BenchmarkClaude Sonnet 5.5Muse Spark
GPQA Diamond95.6%89.8%
LMArena Expert15401457
Humanity's Last Exam—40.6%
SimpleQA Verified46.5%—

Multimodal Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 51.5 (#6), Muse Spark: 43.4 (#24)

BenchmarkClaude Sonnet 5.5Muse Spark
LMArena Vision12891306
Furniture Assembly75%—
LMArena Document—1444

Multilingual Too close to call

Claude Sonnet 5.5: 55.3 (#30), Muse Spark: 56.1 (#24)

BenchmarkClaude Sonnet 5.5Muse Spark
LMArena Non-English14521464
LMArena Chinese15221509
LMArena Russian14511466
LMArena French—1497
LMArena German—1497
LMArena Korean—1459
LMArena Spanish—1472

Instruction Following Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 78.3 (#11), Muse Spark: 75.9 (#51)

BenchmarkClaude Sonnet 5.5Muse Spark
LMArena Instruction Following14951442

Long Context Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 45.9 (#28), Muse Spark: 44.4 (#69)

BenchmarkClaude Sonnet 5.5Muse Spark
LMArena Longer Query14981451

Writing & Preference Too close to call

Claude Sonnet 5.5: 66.0 (#40), Muse Spark: 66.0 (#39)

BenchmarkClaude Sonnet 5.5Muse Spark
LMArena Text14711474
LMArena Creative Writing14651459
LMArena Multi-Turn14741477

Frequently asked questions

Is Claude Sonnet 5.5 better than Muse Spark?

Claude Sonnet 5.5 is the stronger model overall, scoring 61.9 to 50.6 on the Noometry Index.

Is Claude Sonnet 5.5 or Muse Spark better for coding?

Claude Sonnet 5.5 scores higher on coding benchmarks: 67.3 versus 46.2 in the Noometry coding category.

How many benchmarks do Claude Sonnet 5.5 and Muse Spark share?

19 benchmarks have published results for both models. Claude Sonnet 5.5 has 32 scored results on Noometry and Muse Spark has 27.

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