Noometry

Model comparison

Claude Opus 5.5 vs Muse Spark

Claude Opus 5.5 is the stronger model overall, scoring 68.5 to 50.3 on the Noometry Index.

Last verified . 16 shared benchmarks.

Claude Opus 5.5 Anthropic

68.5

Rank #3 Confirmed

Muse Spark Meta

50.3

Rank #41 Confirmed

Summary

  • They share 16 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 math, where Claude Opus 5.5 leads 92.4 to 46.8.
  • 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 Index68.550.3
Released2026-09-222026-04-08
WeightsProprietaryProprietary
Context window1M—
Max output128K—
Input $ / M tokens$4—
Output $ / M tokens$20—
Results tracked3527

Sponsored placements are available on pages like this one. Advertise on Noometry

Category by category

Coding Claude Opus 5.5 leads

Claude Opus 5.5: 71.4 (#1), Muse Spark: 45.6 (#65)

BenchmarkClaude Opus 5.5Muse Spark
SciCode66.9%51.5%
LMArena Coding15451482
FrontierCode54.4%—
CursorBench57.8%—
LMArena WebDev1820—
FrontierSWE62.3%—
MirrorCode77.4%—

Agentic & Tool Use Not comparable

Claude Opus 5.5: 45.3 (#13), Muse Spark: —

BenchmarkClaude Opus 5.5Muse Spark
APEX-Agents73.5%—
GDP.pdf30.6%—

Reasoning Claude Opus 5.5 leads

Claude Opus 5.5: 79.5 (#2), Muse Spark: 34.9 (#61)

BenchmarkClaude Opus 5.5Muse Spark
CritPt31.7%11.3%
LMArena Hard Prompts15451475
ARC-AGI-292.5%—
NYT Connections (extended)88.5%—
ARC-AGI-197.5%—
EBR-Bench71.4%—
Mystery Game Puzzles71%—
DTBench98.9%—
LMCA68.2%—
Epoch Capabilities Index—152.09

Math Claude Opus 5.5 leads

Claude Opus 5.5: 92.4 (#2), Muse Spark: 46.8 (#57)

BenchmarkClaude Opus 5.5Muse Spark
OTIS Mock AIME 2024-2025100%88.9%
ProofBench100%17%
FrontierMath (Tiers 1-3)91.2%—
FrontierMath Tier 495%—
LMArena Math—1455
FrontierMath (Feb 2025 set)—39%
FrontierMath Tier 4 (v1)—14.6%

Knowledge Too close to call

Claude Opus 5.5: 66.6 (#9), Muse Spark: 65.7 (#12)

BenchmarkClaude Opus 5.5Muse Spark
GPQA Diamond90.6%89.8%
LMArena Expert15641458
Humanity's Last Exam—40.6%
SimpleQA Verified72.2%—

Multimodal Claude Opus 5.5 leads

Claude Opus 5.5: 56.5 (#2), Muse Spark: 42.7 (#23)

BenchmarkClaude Opus 5.5Muse Spark
LMArena Vision—1306
Furniture Assembly83.3%—
LMArena Document—1444

Multilingual Claude Opus 5.5 leads

Claude Opus 5.5: 59.8 (#1), Muse Spark: 56.3 (#23)

BenchmarkClaude Opus 5.5Muse Spark
LMArena Non-English15131464
LMArena Chinese15721507
LMArena Russian15321467
LMArena French—1497
LMArena German—1497
LMArena Korean—1457
LMArena Spanish—1471

Instruction Following Claude Opus 5.5 leads

Claude Opus 5.5: 80.1 (#2), Muse Spark: 76.1 (#47)

BenchmarkClaude Opus 5.5Muse Spark
LMArena Instruction Following15351443

Long Context Claude Opus 5.5 leads

Claude Opus 5.5: 47.3 (#18), Muse Spark: 44.4 (#65)

BenchmarkClaude Opus 5.5Muse Spark
LMArena Longer Query15401451

Writing & Preference Claude Opus 5.5 leads

Claude Opus 5.5: 78.7 (#3), Muse Spark: 66.2 (#37)

BenchmarkClaude Opus 5.5Muse Spark
LMArena Text15181474
LMArena Creative Writing15381460
LMArena Multi-Turn15201477
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 68.5 to 50.3 on the Noometry Index.

Is Claude Opus 5.5 or Muse Spark better for coding?

Claude Opus 5.5 scores higher on coding benchmarks: 71.4 versus 45.6 in the Noometry coding category.

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

16 benchmarks have published results for both models. Claude Opus 5.5 has 35 scored results on Noometry and Muse Spark has 27.

Related comparisons

Go deeper