Noometry

Model comparison

GPT-4.5 vs Muse Spark 1.2

Muse Spark 1.2 is the stronger model overall, scoring 50.3 to 37.2 on the Noometry Index.

Last verified . 18 shared benchmarks.

GPT-4.5 OpenAI

37.2

Rank #208 Confirmed

Muse Spark 1.2 Meta

50.3

Rank #48 Confirmed

Summary

  • They share 18 benchmarks with published results for both. GPT-4.5 scores higher in 0 categories and Muse Spark 1.2 in 10 categories; 10 gaps are clear of the uncertainty.
  • The widest gap is in reasoning, where Muse Spark 1.2 leads 51.3 to 13.9.
  • The biggest single-benchmark swing is SimpleBench: 34.5% for GPT-4.5 and 74.5% for Muse Spark 1.2.

Side by side

GPT-4.5Muse Spark 1.2
ProviderOpenAIMeta
Noometry Index37.250.3
Released2025-02-272026-08-05
WeightsProprietaryProprietary
Context window—1.05M
Max output—131K
Input $ / M tokens—$1.25
Output $ / M tokens—$4.25
Results tracked4231

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Category by category

Coding Muse Spark 1.2 leads

GPT-4.5: 42.2 (#109), Muse Spark 1.2: 49.2 (#51)

BenchmarkGPT-4.5Muse Spark 1.2
WeirdML39.4%60.3%
LMArena Coding13961495
DeepSWE—54.9%
Aider Polyglot44.9%—
LMArena WebDev—1533
FrontierSWE—12%
SciCode—56.4%
LiveBench Coding75.2%—

Agentic & Tool Use Muse Spark 1.2 leads

GPT-4.5: 27.9 (#97), Muse Spark 1.2: 29.4 (#87)

BenchmarkGPT-4.5Muse Spark 1.2
APEX-Agents—36.4%
Cybench17.5%—
GDP.pdf—16%

Reasoning Muse Spark 1.2 leads

GPT-4.5: 13.9 (#330), Muse Spark 1.2: 51.3 (#34)

BenchmarkGPT-4.5Muse Spark 1.2
SimpleBench34.5%74.5%
LMArena Hard Prompts14031486
Epoch Capabilities Index136.74154.87
ARC-AGI-20.8%—
NYT Connections (extended)—79.2%
ARC-AGI-110.3%—
CritPt—17.7%
EnigmaEval3.2%—
LiveBench Reasoning71.1%—
DTBench—94.7%
LiveBench Data Analysis64.3%—
LMCA—48.4%
ForecastBench61.7—
LiveBench69%—

Math Muse Spark 1.2 leads

GPT-4.5: 32.6 (#211), Muse Spark 1.2: 46.4 (#70)

BenchmarkGPT-4.5Muse Spark 1.2
LMArena Math14121471
OTIS Mock AIME 2024-202537.8%—
ProofBench—43%
LiveBench Math69.3%—
MATH Level 578.6%—

Knowledge Muse Spark 1.2 leads

GPT-4.5: 32.5 (#211), Muse Spark 1.2: 54.1 (#53)

BenchmarkGPT-4.5Muse Spark 1.2
LMArena Expert13941480
GPQA Diamond68.7%—
Humanity's Last Exam5.4%—
SimpleQA Verified—60.3%
Confabulations13.6%—

Multimodal Muse Spark 1.2 leads

GPT-4.5: 37.6 (#71), Muse Spark 1.2: 43.4 (#25)

BenchmarkGPT-4.5Muse Spark 1.2
LMArena Vision11951305
VPCT45%—

Multilingual Muse Spark 1.2 leads

GPT-4.5: 52.5 (#83), Muse Spark 1.2: 57.1 (#11)

BenchmarkGPT-4.5Muse Spark 1.2
LMArena Non-English14131478
LMArena Chinese14211511
LMArena French14181513
LMArena Russian14191487
LMArena German1457—
LMArena Japanese1416—
LMArena Korean1392—
LMArena Spanish—1498

Instruction Following Muse Spark 1.2 leads

GPT-4.5: 72.6 (#134), Muse Spark 1.2: 76.7 (#36)

BenchmarkGPT-4.5Muse Spark 1.2
LMArena Instruction Following14041461
LiveBench Instruction Following72.3%—

Long Context Muse Spark 1.2 leads

GPT-4.5: 40.4 (#155), Muse Spark 1.2: 45.2 (#48)

BenchmarkGPT-4.5Muse Spark 1.2
LMArena Longer Query14061475
Fiction.LiveBench63.9%—

Writing & Preference Muse Spark 1.2 leads

GPT-4.5: 56.9 (#134), Muse Spark 1.2: 72.3 (#14)

BenchmarkGPT-4.5Muse Spark 1.2
LMArena Text14171482
LMArena Creative Writing13941449
EQ-Bench Creative Writing12581840
LMArena Multi-Turn14441494
Short-Story Creative Writing75.6%—
LiveBench Language61.5%—

Frequently asked questions

Is GPT-4.5 better than Muse Spark 1.2?

Muse Spark 1.2 is the stronger model overall, scoring 50.3 to 37.2 on the Noometry Index.

Is GPT-4.5 or Muse Spark 1.2 better for coding?

Muse Spark 1.2 scores higher on coding benchmarks: 49.2 versus 42.2 in the Noometry coding category.

How many benchmarks do GPT-4.5 and Muse Spark 1.2 share?

18 benchmarks have published results for both models. GPT-4.5 has 42 scored results on Noometry and Muse Spark 1.2 has 31.

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