Noometry

Model comparison

Claude Opus 5.5 vs Muse Spark 1.2

Claude Opus 5.5 is the stronger model overall, scoring 68.6 to 50.3 on the Noometry Index. Muse Spark 1.2 costs 4.0× less per token, which makes it the better buy when Claude Opus 5.5's lead doesn't matter for your workload.

Last verified . 28 shared benchmarks.

Claude Opus 5.5 Anthropic

68.6

Rank #3 Confirmed

Muse Spark 1.2 Meta

50.3

Rank #48 Confirmed

Summary

  • They share 28 benchmarks with published results for both. Claude Opus 5.5 scores higher in 10 categories and Muse Spark 1.2 in 0 categories; 10 gaps are clear of the uncertainty.
  • The widest gap is in math, where Claude Opus 5.5 leads 91.8 to 46.4.
  • The biggest single-benchmark swing is ProofBench: 100% for Claude Opus 5.5 and 43% for Muse Spark 1.2.
  • Muse Spark 1.2 is cheaper at $1.25 / $4.25 per million input/output tokens, against $4 / $20 for Claude Opus 5.5.
  • Muse Spark 1.2 accepts more context: 1.05M tokens versus 1M.

Side by side

Claude Opus 5.5Muse Spark 1.2
ProviderAnthropicMeta
Noometry Index68.650.3
Released2026-09-222026-08-05
WeightsProprietaryProprietary
Context window1M1.05M
Max output128K131K
Input $ / M tokens$4$1.25
Output $ / M tokens$20$4.25
Results tracked4431

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: 71.9 (#3), Muse Spark 1.2: 49.2 (#51)

BenchmarkClaude Opus 5.5Muse Spark 1.2
LMArena WebDev18131533
FrontierSWE62.3%12%
SciCode66.9%56.4%
LMArena Coding15471495
DeepSWE—54.9%
FrontierCode54.6%—
CursorBench57.8%—
WeirdML—60.3%
MirrorCode77.4%—
ALE-Bench2,147—

Agentic & Tool Use Claude Opus 5.5 leads

Claude Opus 5.5: 45.3 (#15), Muse Spark 1.2: 29.4 (#87)

BenchmarkClaude Opus 5.5Muse Spark 1.2
APEX-Agents73.5%36.4%
GDP.pdf30.6%16%
Vending-Bench 29,235—

Reasoning Claude Opus 5.5 leads

Claude Opus 5.5: 80.2 (#3), Muse Spark 1.2: 51.3 (#34)

BenchmarkClaude Opus 5.5Muse Spark 1.2
NYT Connections (extended)88.5%79.2%
CritPt31.7%17.7%
LMArena Hard Prompts15351486
DTBench98.9%94.7%
LMCA68.2%48.4%
Epoch Capabilities Index167.33154.87
ARC-AGI-293.3%—
SimpleBench—74.5%
ARC-AGI-198.5%—
EBR-Bench71.4%—
Mystery Game Puzzles71%—

Math Claude Opus 5.5 leads

Claude Opus 5.5: 91.8 (#3), Muse Spark 1.2: 46.4 (#70)

BenchmarkClaude Opus 5.5Muse Spark 1.2
ProofBench100%43%
LMArena Math15061471
FrontierMath (Tiers 1-3)91.2%—
FrontierMath Tier 495%—
OTIS Mock AIME 2024-2025100%—
FrontierMath Erdős2.9%—

Knowledge Claude Opus 5.5 leads

Claude Opus 5.5: 66.4 (#10), Muse Spark 1.2: 54.1 (#53)

BenchmarkClaude Opus 5.5Muse Spark 1.2
SimpleQA Verified72.2%60.3%
LMArena Expert15471480
GPQA Diamond90.6%—

Multimodal Claude Opus 5.5 leads

Claude Opus 5.5: 57.8 (#1), Muse Spark 1.2: 43.4 (#25)

BenchmarkClaude Opus 5.5Muse Spark 1.2
LMArena Vision13211305
Blueprint-Bench 251.2%—
Furniture Assembly83.3%—

Multilingual Claude Opus 5.5 leads

Claude Opus 5.5: 59.1 (#2), Muse Spark 1.2: 57.1 (#11)

BenchmarkClaude Opus 5.5Muse Spark 1.2
LMArena Non-English15071478
LMArena Chinese15881511
LMArena French15141513
LMArena Russian15201487
LMArena Spanish15071498

Instruction Following Claude Opus 5.5 leads

Claude Opus 5.5: 80.0 (#3), Muse Spark 1.2: 76.7 (#36)

BenchmarkClaude Opus 5.5Muse Spark 1.2
LMArena Instruction Following15371461

Long Context Claude Opus 5.5 leads

Claude Opus 5.5: 47.1 (#19), Muse Spark 1.2: 45.2 (#48)

BenchmarkClaude Opus 5.5Muse Spark 1.2
LMArena Longer Query15321475

Writing & Preference Claude Opus 5.5 leads

Claude Opus 5.5: 78.2 (#3), Muse Spark 1.2: 72.3 (#14)

BenchmarkClaude Opus 5.5Muse Spark 1.2
LMArena Text15151482
LMArena Creative Writing15331449
EQ-Bench Creative Writing20501840
LMArena Multi-Turn14991494

Frequently asked questions

Is Claude Opus 5.5 better than Muse Spark 1.2?

Claude Opus 5.5 is the stronger model overall, scoring 68.6 to 50.3 on the Noometry Index. Muse Spark 1.2 costs 4.0× less per token, which makes it the better buy when Claude Opus 5.5's lead doesn't matter for your workload.

Which is cheaper, Claude Opus 5.5 or Muse Spark 1.2?

Muse Spark 1.2 is cheaper. It lists at $1.25 per million input tokens and $4.25 per million output tokens; Claude Opus 5.5 lists at $4 and $20.

Is Claude Opus 5.5 or Muse Spark 1.2 better for coding?

Claude Opus 5.5 scores higher on coding benchmarks: 71.9 versus 49.2 in the Noometry coding category.

Which has the bigger context window?

Muse Spark 1.2 does, with 1.05M tokens against 1M.

How many benchmarks do Claude Opus 5.5 and Muse Spark 1.2 share?

28 benchmarks have published results for both models. Claude Opus 5.5 has 44 scored results on Noometry and Muse Spark 1.2 has 31.

Related comparisons

Go deeper