Noometry

Model comparison

Claude Sonnet 5 vs Muse Spark 1.2

Claude Sonnet 5 is the stronger model overall, scoring 54.6 to 50.3 on the Noometry Index. Muse Spark 1.2 costs 2.0× less per token, which makes it the better buy when Claude Sonnet 5's lead doesn't matter for your workload.

Last verified . 29 shared benchmarks.

Claude Sonnet 5 Anthropic

54.6

Rank #29 Confirmed

Muse Spark 1.2 Meta

50.3

Rank #48 Confirmed

Summary

  • They share 29 benchmarks with published results for both. Claude Sonnet 5 scores higher in 4 categories and Muse Spark 1.2 in 6 categories; 8 gaps are clear of the uncertainty.
  • The widest gap is in math, where Claude Sonnet 5 leads 66.2 to 46.4.
  • The biggest single-benchmark swing is ProofBench: 77% for Claude Sonnet 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 $2 / $10 for Claude Sonnet 5.
  • Muse Spark 1.2 accepts more context: 1.05M tokens versus 1M.

Side by side

Claude Sonnet 5Muse Spark 1.2
ProviderAnthropicMeta
Noometry Index54.650.3
Released2026-06-292026-08-05
WeightsProprietaryProprietary
Context window1M1.05M
Max output128K131K
Input $ / M tokens$2$1.25
Output $ / M tokens$10$4.25
Results tracked5131

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Category by category

Coding Claude Sonnet 5 leads

Claude Sonnet 5: 55.5 (#26), Muse Spark 1.2: 49.2 (#51)

BenchmarkClaude Sonnet 5Muse Spark 1.2
DeepSWE53.8%54.9%
LMArena WebDev15411533
SciCode54.3%56.4%
WeirdML68.8%60.3%
LMArena Coding14831495
FrontierCode42.7%—
CursorBench34.1%—
FrontierSWE—12%
GSO37.3%—
ALE-Bench1,463—

Agentic & Tool Use Claude Sonnet 5 leads

Claude Sonnet 5: 42.8 (#18), Muse Spark 1.2: 29.4 (#87)

BenchmarkClaude Sonnet 5Muse Spark 1.2
APEX-Agents54.5%36.4%
GBAEval65.3%—
GDP.pdf—16%
LMArena Search1194—
Vending-Bench 26,378—

Reasoning Muse Spark 1.2 leads

Claude Sonnet 5: 49.1 (#39), Muse Spark 1.2: 51.3 (#34)

BenchmarkClaude Sonnet 5Muse Spark 1.2
SimpleBench60.6%74.5%
NYT Connections (extended)75.1%79.2%
CritPt16.9%17.7%
LMArena Hard Prompts14611486
DTBench92.5%94.7%
LMCA50%48.4%
Epoch Capabilities Index156.21154.87
Chess Puzzles35%—
Mystery Game Puzzles35%—
Surface Evolver Bench60%—
Bench to the Future 30.14—
ForecastBench61.1—

Math Claude Sonnet 5 leads

Claude Sonnet 5: 66.2 (#27), Muse Spark 1.2: 46.4 (#70)

BenchmarkClaude Sonnet 5Muse Spark 1.2
ProofBench77%43%
LMArena Math14671471
FrontierMath (Tiers 1-3)65.6%—
FrontierMath Tier 429.3%—
OTIS Mock AIME 2024-202594.7%—

Knowledge Claude Sonnet 5 leads

Claude Sonnet 5: 55.6 (#47), Muse Spark 1.2: 54.1 (#53)

BenchmarkClaude Sonnet 5Muse Spark 1.2
SimpleQA Verified33.7%60.3%
LMArena Expert14901480
GPQA Diamond90.5%—

Multimodal Muse Spark 1.2 leads

Claude Sonnet 5: 42.4 (#31), Muse Spark 1.2: 43.4 (#25)

BenchmarkClaude Sonnet 5Muse Spark 1.2
LMArena Vision12741305
Blueprint-Bench 224.9%—
LMArena Document1466—

Multilingual Muse Spark 1.2 leads

Claude Sonnet 5: 53.8 (#55), Muse Spark 1.2: 57.1 (#11)

BenchmarkClaude Sonnet 5Muse Spark 1.2
LMArena Non-English14311478
LMArena Chinese14771511
LMArena French14601513
LMArena Russian14511487
LMArena Spanish14371498
LMArena German1440—
LMArena Japanese1422—
LMArena Korean1411—

Instruction Following Too close to call

Claude Sonnet 5: 76.3 (#41), Muse Spark 1.2: 76.7 (#36)

BenchmarkClaude Sonnet 5Muse Spark 1.2
LMArena Instruction Following14521461

Long Context Too close to call

Claude Sonnet 5: 44.8 (#55), Muse Spark 1.2: 45.2 (#48)

BenchmarkClaude Sonnet 5Muse Spark 1.2
LMArena Longer Query14631475

Writing & Preference Muse Spark 1.2 leads

Claude Sonnet 5: 69.2 (#25), Muse Spark 1.2: 72.3 (#14)

BenchmarkClaude Sonnet 5Muse Spark 1.2
LMArena Text14421482
LMArena Creative Writing14161449
EQ-Bench Creative Writing17941840
LMArena Multi-Turn14541494
EQ-Bench 41236—

Frequently asked questions

Is Claude Sonnet 5 better than Muse Spark 1.2?

Claude Sonnet 5 is the stronger model overall, scoring 54.6 to 50.3 on the Noometry Index. Muse Spark 1.2 costs 2.0× less per token, which makes it the better buy when Claude Sonnet 5's lead doesn't matter for your workload.

Which is cheaper, Claude Sonnet 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 Sonnet 5 lists at $2 and $10.

Is Claude Sonnet 5 or Muse Spark 1.2 better for coding?

Claude Sonnet 5 scores higher on coding benchmarks: 55.5 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 Sonnet 5 and Muse Spark 1.2 share?

29 benchmarks have published results for both models. Claude Sonnet 5 has 51 scored results on Noometry and Muse Spark 1.2 has 31.

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