Noometry

Model comparison

Claude Opus 5.5 vs Muse Spark

Claude Opus 5.5 is the stronger model overall, scoring 68.6 to 50.6 on the Noometry Index.

Last verified . 21 shared benchmarks.

Claude Opus 5.5 Anthropic

68.6

Rank #3 Confirmed

Muse Spark Meta

50.6

Rank #46 Confirmed

Summary

  • They share 21 benchmarks with published results for both. Claude Opus 5.5 scores higher in 9 categories and Muse Spark in 0 categories; 8 gaps are clear of the uncertainty.
  • The widest gap is in reasoning, where Claude Opus 5.5 leads 80.2 to 35.9.
  • The biggest single-benchmark swing is ProofBench: 100% for Claude Opus 5.5 and 17% for Muse Spark.

Side by side

Claude Opus 5.5Muse Spark
ProviderAnthropicMeta
Noometry Index68.650.6
Released2026-09-222026-04-08
WeightsProprietaryProprietary
Context window1M—
Max output128K—
Input $ / M tokens$4—
Output $ / M tokens$20—
Results tracked4427

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Category by category

Coding Claude Opus 5.5 leads

Claude Opus 5.5: 71.9 (#3), Muse Spark: 46.2 (#69)

BenchmarkClaude Opus 5.5Muse Spark
SciCode66.9%51.5%
LMArena Coding15471481
FrontierCode54.6%—
CursorBench57.8%—
LMArena WebDev1813—
FrontierSWE62.3%—
MirrorCode77.4%—
ALE-Bench2,147—

Agentic & Tool Use Not comparable

Claude Opus 5.5: 45.3 (#15), Muse Spark: —

BenchmarkClaude Opus 5.5Muse Spark
APEX-Agents73.5%—
GDP.pdf30.6%—
Vending-Bench 29,235—

Reasoning Claude Opus 5.5 leads

Claude Opus 5.5: 80.2 (#3), Muse Spark: 35.9 (#67)

BenchmarkClaude Opus 5.5Muse Spark
CritPt31.7%11.3%
LMArena Hard Prompts15351474
Epoch Capabilities Index167.33152.04
ARC-AGI-293.3%—
NYT Connections (extended)88.5%—
ARC-AGI-198.5%—
EBR-Bench71.4%—
Mystery Game Puzzles71%—
DTBench98.9%—
LMCA68.2%—

Math Claude Opus 5.5 leads

Claude Opus 5.5: 91.8 (#3), Muse Spark: 47.8 (#66)

BenchmarkClaude Opus 5.5Muse Spark
OTIS Mock AIME 2024-2025100%88.9%
ProofBench100%17%
LMArena Math15061455
FrontierMath (Tiers 1-3)91.2%—
FrontierMath Tier 495%—
FrontierMath (Feb 2025 set)—39%
FrontierMath Erdős2.9%—
FrontierMath Tier 4 (v1)—14.6%

Knowledge Too close to call

Claude Opus 5.5: 66.4 (#10), Muse Spark: 65.7 (#13)

BenchmarkClaude Opus 5.5Muse Spark
GPQA Diamond90.6%89.8%
LMArena Expert15471457
Humanity's Last Exam—40.6%
SimpleQA Verified72.2%—

Multimodal Claude Opus 5.5 leads

Claude Opus 5.5: 57.8 (#1), Muse Spark: 43.4 (#24)

BenchmarkClaude Opus 5.5Muse Spark
LMArena Vision13211306
Blueprint-Bench 251.2%—
Furniture Assembly83.3%—
LMArena Document—1444

Multilingual Claude Opus 5.5 leads

Claude Opus 5.5: 59.1 (#2), Muse Spark: 56.1 (#24)

BenchmarkClaude Opus 5.5Muse Spark
LMArena Non-English15071464
LMArena Chinese15881509
LMArena French15141497
LMArena Russian15201466
LMArena Spanish15071472
LMArena German—1497
LMArena Korean—1459

Instruction Following Claude Opus 5.5 leads

Claude Opus 5.5: 80.0 (#3), Muse Spark: 75.9 (#51)

BenchmarkClaude Opus 5.5Muse Spark
LMArena Instruction Following15371442

Long Context Claude Opus 5.5 leads

Claude Opus 5.5: 47.1 (#19), Muse Spark: 44.4 (#69)

BenchmarkClaude Opus 5.5Muse Spark
LMArena Longer Query15321451

Writing & Preference Claude Opus 5.5 leads

Claude Opus 5.5: 78.2 (#3), Muse Spark: 66.0 (#39)

BenchmarkClaude Opus 5.5Muse Spark
LMArena Text15151474
LMArena Creative Writing15331459
LMArena Multi-Turn14991477
EQ-Bench Creative Writing2050—

Frequently asked questions

Is Claude Opus 5.5 better than Muse Spark?

Claude Opus 5.5 is the stronger model overall, scoring 68.6 to 50.6 on the Noometry Index.

Is Claude Opus 5.5 or Muse Spark better for coding?

Claude Opus 5.5 scores higher on coding benchmarks: 71.9 versus 46.2 in the Noometry coding category.

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

21 benchmarks have published results for both models. Claude Opus 5.5 has 44 scored results on Noometry and Muse Spark has 27.

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