Noometry

Model comparison

GPT-5.4 mini vs Muse Spark 1.2

Muse Spark 1.2 is the stronger model overall, scoring 50.3 to 45.0 on the Noometry Index.

Last verified . 26 shared benchmarks.

GPT-5.4 mini OpenAI

45.0

Rank #76 Confirmed

Muse Spark 1.2 Meta

50.3

Rank #48 Confirmed

Summary

  • They share 26 benchmarks with published results for both. GPT-5.4 mini scores higher in 1 category and Muse Spark 1.2 in 9 categories; 8 gaps are clear of the uncertainty.
  • The widest gap is in reasoning, where Muse Spark 1.2 leads 51.3 to 30.4.
  • The biggest single-benchmark swing is SimpleQA Verified: 29.4% for GPT-5.4 mini and 60.3% for Muse Spark 1.2.
  • GPT-5.4 mini is cheaper at $0.75 / $4.50 per million input/output tokens, against $1.25 / $4.25 for Muse Spark 1.2.
  • Muse Spark 1.2 accepts more context: 1.05M tokens versus 400K.

Side by side

GPT-5.4 miniMuse Spark 1.2
ProviderOpenAIMeta
Noometry Index45.050.3
Released2026-03-172026-08-05
WeightsProprietaryProprietary
Context window400K1.05M
Max output128K131K
Input $ / M tokens$0.75$1.25
Output $ / M tokens$4.50$4.25
Results tracked4631

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Category by category

Coding Muse Spark 1.2 leads

GPT-5.4 mini: 45.2 (#72), Muse Spark 1.2: 49.2 (#51)

BenchmarkGPT-5.4 miniMuse Spark 1.2
LMArena WebDev13971533
SciCode49.9%56.4%
WeirdML60.3%60.3%
LMArena Coding14381495
DeepSWE—54.9%
FrontierCode27%—
FrontierSWE—12%
ALE-Bench1,189—

Agentic & Tool Use Too close to call

GPT-5.4 mini: 29.9 (#81), Muse Spark 1.2: 29.4 (#87)

BenchmarkGPT-5.4 miniMuse Spark 1.2
APEX-Agents—36.4%
DeepResearch Bench36.3%—
GDP.pdf—16%

Reasoning Muse Spark 1.2 leads

GPT-5.4 mini: 30.4 (#85), Muse Spark 1.2: 51.3 (#34)

BenchmarkGPT-5.4 miniMuse Spark 1.2
NYT Connections (extended)61.8%79.2%
CritPt10%17.7%
LMArena Hard Prompts14241486
DTBench80%94.7%
LMCA40.8%48.4%
Epoch Capabilities Index148.84154.87
ARC-AGI-218.9%—
SimpleBench—74.5%
Kagi LLM Benchmark37.9%—
ARC-AGI-163.7%—
Chess Puzzles24%—
Thematic Generalization61.7%—
Mystery Game Puzzles11%—
ForecastBench57—

Math Too close to call

GPT-5.4 mini: 45.5 (#75), Muse Spark 1.2: 46.4 (#70)

BenchmarkGPT-5.4 miniMuse Spark 1.2
ProofBench21%43%
LMArena Math14191471
FrontierMath (Tiers 1-3)51.2%—
FrontierMath Tier 49.8%—
OTIS Mock AIME 2024-202588.9%—
FrontierMath (Feb 2025 set)28.3%—
FrontierMath Tier 4 (v1)2.1%—

Knowledge Muse Spark 1.2 leads

GPT-5.4 mini: 51.5 (#67), Muse Spark 1.2: 54.1 (#53)

BenchmarkGPT-5.4 miniMuse Spark 1.2
SimpleQA Verified29.4%60.3%
LMArena Expert14351480
GPQA Diamond86.9%—
Vectara Hallucination Rate5.5%—

Multimodal Muse Spark 1.2 leads

GPT-5.4 mini: 39.7 (#56), Muse Spark 1.2: 43.4 (#25)

BenchmarkGPT-5.4 miniMuse Spark 1.2
LMArena Vision12451305

Multilingual Muse Spark 1.2 leads

GPT-5.4 mini: 51.9 (#96), Muse Spark 1.2: 57.1 (#11)

BenchmarkGPT-5.4 miniMuse Spark 1.2
LMArena Non-English14051478
LMArena Chinese14461511
LMArena French14401513
LMArena Russian14171487
LMArena Spanish14051498
LMArena German1409—
LMArena Japanese1374—
LMArena Korean1368—

Instruction Following Muse Spark 1.2 leads

GPT-5.4 mini: 74.1 (#102), Muse Spark 1.2: 76.7 (#36)

BenchmarkGPT-5.4 miniMuse Spark 1.2
LMArena Instruction Following14051461

Long Context Muse Spark 1.2 leads

GPT-5.4 mini: 43.0 (#112), Muse Spark 1.2: 45.2 (#48)

BenchmarkGPT-5.4 miniMuse Spark 1.2
LMArena Longer Query14071475

Writing & Preference Muse Spark 1.2 leads

GPT-5.4 mini: 64.0 (#58), Muse Spark 1.2: 72.3 (#14)

BenchmarkGPT-5.4 miniMuse Spark 1.2
LMArena Text14121482
LMArena Creative Writing13701449
EQ-Bench Creative Writing16651840
LMArena Multi-Turn14291494

Frequently asked questions

Is GPT-5.4 mini better than Muse Spark 1.2?

Muse Spark 1.2 is the stronger model overall, scoring 50.3 to 45.0 on the Noometry Index.

Which is cheaper, GPT-5.4 mini or Muse Spark 1.2?

GPT-5.4 mini is cheaper. It lists at $0.75 per million input tokens and $4.50 per million output tokens; Muse Spark 1.2 lists at $1.25 and $4.25.

Is GPT-5.4 mini or Muse Spark 1.2 better for coding?

Muse Spark 1.2 scores higher on coding benchmarks: 49.2 versus 45.2 in the Noometry coding category.

Which has the bigger context window?

Muse Spark 1.2 does, with 1.05M tokens against 400K.

How many benchmarks do GPT-5.4 mini and Muse Spark 1.2 share?

26 benchmarks have published results for both models. GPT-5.4 mini has 46 scored results on Noometry and Muse Spark 1.2 has 31.

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