Noometry

Model comparison

Claude Opus 4.5 vs Muse Spark 1.2

Claude Opus 4.5 and Muse Spark 1.2 score almost the same on the Noometry Index (50.5 vs 50.3), so choose on price, context window or the category you care about most.

Last verified . 24 shared benchmarks.

Claude Opus 4.5 Anthropic

50.5

Rank #47 Confirmed

Muse Spark 1.2 Meta

50.3

Rank #48 Confirmed

Summary

  • They share 24 benchmarks with published results for both. Claude Opus 4.5 scores higher in 5 categories and Muse Spark 1.2 in 5 categories; 9 gaps are clear of the uncertainty.
  • The widest gap is in agentic & tool use, where Claude Opus 4.5 leads 47.3 to 29.4.
  • The biggest single-benchmark swing is NYT Connections (extended): 52.5% for Claude Opus 4.5 and 79.2% for Muse Spark 1.2.
  • Muse Spark 1.2 is cheaper at $1.25 / $4.25 per million input/output tokens, against $5 / $25 for Claude Opus 4.5.
  • Muse Spark 1.2 accepts more context: 1.05M tokens versus 200K.

Side by side

Claude Opus 4.5Muse Spark 1.2
ProviderAnthropicMeta
Noometry Index50.550.3
Released2025-11-012026-08-05
WeightsProprietaryProprietary
Context window200K1.05M
Max output64K131K
Input $ / M tokens$5$1.25
Output $ / M tokens$25$4.25
Results tracked6931

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Category by category

Coding Claude Opus 4.5 leads

Claude Opus 4.5: 54.8 (#27), Muse Spark 1.2: 49.2 (#51)

BenchmarkClaude Opus 4.5Muse Spark 1.2
LMArena WebDev14941533
WeirdML63.7%60.3%
LMArena Coding15041495
SWE-bench Verified76.7%—
DeepSWE—54.9%
SWE-bench Verified (bash only)76.8%—
SWE-bench Multilingual70.7%—
FrontierSWE—12%
SciCode—56.4%
GSO26.5%—
ALE-Bench1,025—
AlgoTune1.77—

Agentic & Tool Use Claude Opus 4.5 leads

Claude Opus 4.5: 47.3 (#12), Muse Spark 1.2: 29.4 (#87)

BenchmarkClaude Opus 4.5Muse Spark 1.2
Terminal-Bench63.1%—
APEX-Agents—36.4%
Berkeley Function Calling Leaderboard77.5%—
GDPval45.5%—
Remote Labor Index3.8%—
τ²-bench Airline84%—
τ²-bench Banking24.7%—
τ²-bench Retail79.6%—
τ²-bench Telecom92.3%—
Cybench82%—
DeepResearch Bench54.8%—
OSWorld66.3%—
BALROG43.5%—
GDP.pdf—16%
LMArena Search1180—
METR Time Horizons75%—
Vending-Bench 24,967—

Reasoning Muse Spark 1.2 leads

Claude Opus 4.5: 42.6 (#51), Muse Spark 1.2: 51.3 (#34)

BenchmarkClaude Opus 4.5Muse Spark 1.2
SimpleBench62%74.5%
NYT Connections (extended)52.5%79.2%
LMArena Hard Prompts14761486
DTBench89.9%94.7%
LMCA44.5%48.4%
Epoch Capabilities Index150.09154.87
ARC-AGI-237.6%—
Kagi LLM Benchmark80.2%—
ARC-AGI-180%—
CritPt—17.7%
Chess Puzzles12%—
EnigmaEval11.9%—
EBR-Bench14.3%—
Mystery Game Puzzles22%—
ForecastBench60.7—

Math Muse Spark 1.2 leads

Claude Opus 4.5: 38.6 (#132), Muse Spark 1.2: 46.4 (#70)

BenchmarkClaude Opus 4.5Muse Spark 1.2
ProofBench36%43%
LMArena Math14631471
FrontierMath (Tiers 1-3)34.4%—
FrontierMath Tier 44.9%—
OTIS Mock AIME 2024-202586.1%—
FrontierMath (Feb 2025 set)20.7%—
FrontierMath Tier 4 (v1)4.2%—

Knowledge Claude Opus 4.5 leads

Claude Opus 4.5: 56.5 (#44), Muse Spark 1.2: 54.1 (#53)

BenchmarkClaude Opus 4.5Muse Spark 1.2
SimpleQA Verified45.7%60.3%
LMArena Expert14871480
GPQA Diamond86%—
Humanity's Last Exam25.2%—
Vectara Hallucination Rate10.9%—

Multimodal Muse Spark 1.2 leads

Claude Opus 4.5: 31.4 (#107), Muse Spark 1.2: 43.4 (#25)

BenchmarkClaude Opus 4.5Muse Spark 1.2
LMArena Vision—1305
GeoBench75%—
VPCT40%—
Furniture Assembly28.3%—
LMArena Document1462—

Multilingual Muse Spark 1.2 leads

Claude Opus 4.5: 54.3 (#47), Muse Spark 1.2: 57.1 (#11)

BenchmarkClaude Opus 4.5Muse Spark 1.2
LMArena Non-English14381478
LMArena Chinese14701511
LMArena French14711513
LMArena Russian14471487
LMArena Spanish14581498
LMArena German1449—
LMArena Japanese1416—
LMArena Korean1424—

Instruction Following Too close to call

Claude Opus 4.5: 77.5 (#19), Muse Spark 1.2: 76.7 (#36)

BenchmarkClaude Opus 4.5Muse Spark 1.2
LMArena Instruction Following14781461

Long Context Claude Opus 4.5 leads

Claude Opus 4.5: 46.5 (#22), Muse Spark 1.2: 45.2 (#48)

BenchmarkClaude Opus 4.5Muse Spark 1.2
LMArena Longer Query14801475
CL-bench21.1%—

Writing & Preference Muse Spark 1.2 leads

Claude Opus 4.5: 68.1 (#28), Muse Spark 1.2: 72.3 (#14)

BenchmarkClaude Opus 4.5Muse Spark 1.2
LMArena Text14511482
LMArena Creative Writing14451449
EQ-Bench Creative Writing16871840
LMArena Multi-Turn14661494

Frequently asked questions

Is Claude Opus 4.5 better than Muse Spark 1.2?

Claude Opus 4.5 and Muse Spark 1.2 score almost the same on the Noometry Index (50.5 vs 50.3), so choose on price, context window or the category you care about most.

Which is cheaper, Claude Opus 4.5 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 4.5 lists at $5 and $25.

Is Claude Opus 4.5 or Muse Spark 1.2 better for coding?

Claude Opus 4.5 scores higher on coding benchmarks: 54.8 versus 49.2 in the Noometry coding category.

Which has the bigger context window?

Muse Spark 1.2 does, with 1.05M tokens against 200K.

How many benchmarks do Claude Opus 4.5 and Muse Spark 1.2 share?

24 benchmarks have published results for both models. Claude Opus 4.5 has 69 scored results on Noometry and Muse Spark 1.2 has 31.

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