Noometry

Model comparison

GPT-5.4 mini vs Muse Glimmer

GPT-5.4 mini is the stronger model overall, scoring 45.0 to 41.7 on the Noometry Index.

Last verified . 15 shared benchmarks.

GPT-5.4 mini OpenAI

45.0

Rank #76 Confirmed

Muse Glimmer Meta

41.7

Rank #131 Confirmed

Summary

  • They share 15 benchmarks with published results for both. GPT-5.4 mini scores higher in 8 categories and Muse Glimmer in 0 categories; 7 gaps are clear of the uncertainty.
  • The widest gap is in knowledge, where GPT-5.4 mini leads 51.5 to 38.5.
  • The biggest single-benchmark swing is CritPt: 10% for GPT-5.4 mini and 2.6% for Muse Glimmer.
  • Muse Glimmer has downloadable open weights; the other is API-only.

Side by side

GPT-5.4 miniMuse Glimmer
ProviderOpenAIMeta
Noometry Index45.041.7
Released2026-03-172026-08-10
WeightsProprietaryOpen
Context window400K—
Max output128K—
Input $ / M tokens$0.75—
Output $ / M tokens$4.50—
Results tracked4615

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Category by category

Coding GPT-5.4 mini leads

GPT-5.4 mini: 45.2 (#72), Muse Glimmer: 40.4 (#142)

BenchmarkGPT-5.4 miniMuse Glimmer
LMArena WebDev13971355
SciCode49.9%44.9%
LMArena Coding14381416
FrontierCode27%—
WeirdML60.3%—
ALE-Bench1,189—

Agentic & Tool Use Not comparable

GPT-5.4 mini: 29.9 (#81), Muse Glimmer: —

BenchmarkGPT-5.4 miniMuse Glimmer
DeepResearch Bench36.3%—

Reasoning GPT-5.4 mini leads

GPT-5.4 mini: 30.4 (#85), Muse Glimmer: 25.7 (#144)

BenchmarkGPT-5.4 miniMuse Glimmer
CritPt10%2.6%
LMArena Hard Prompts14241396
ARC-AGI-218.9%—
Kagi LLM Benchmark37.9%—
NYT Connections (extended)61.8%—
ARC-AGI-163.7%—
Chess Puzzles24%—
Thematic Generalization61.7%—
Mystery Game Puzzles11%—
DTBench80%—
LMCA40.8%—
Epoch Capabilities Index148.84—
ForecastBench57—

Math GPT-5.4 mini leads

GPT-5.4 mini: 45.5 (#75), Muse Glimmer: 38.8 (#125)

BenchmarkGPT-5.4 miniMuse Glimmer
LMArena Math14191417
FrontierMath (Tiers 1-3)51.2%—
FrontierMath Tier 49.8%—
OTIS Mock AIME 2024-202588.9%—
ProofBench21%—
FrontierMath (Feb 2025 set)28.3%—
FrontierMath Tier 4 (v1)2.1%—

Knowledge GPT-5.4 mini leads

GPT-5.4 mini: 51.5 (#67), Muse Glimmer: 38.5 (#143)

BenchmarkGPT-5.4 miniMuse Glimmer
LMArena Expert14351386
GPQA Diamond86.9%—
SimpleQA Verified29.4%—
Vectara Hallucination Rate5.5%—

Multimodal Not comparable

GPT-5.4 mini: 39.7 (#56), Muse Glimmer: —

BenchmarkGPT-5.4 miniMuse Glimmer
LMArena Vision1245—

Multilingual GPT-5.4 mini leads

GPT-5.4 mini: 51.9 (#96), Muse Glimmer: 50.5 (#122)

BenchmarkGPT-5.4 miniMuse Glimmer
LMArena Non-English14051384
LMArena Chinese14461412
LMArena Russian14171390
LMArena French1440—
LMArena German1409—
LMArena Japanese1374—
LMArena Korean1368—
LMArena Spanish1405—

Instruction Following GPT-5.4 mini leads

GPT-5.4 mini: 74.1 (#102), Muse Glimmer: 72.6 (#135)

BenchmarkGPT-5.4 miniMuse Glimmer
LMArena Instruction Following14051375

Long Context Too close to call

GPT-5.4 mini: 43.0 (#112), Muse Glimmer: 42.1 (#129)

BenchmarkGPT-5.4 miniMuse Glimmer
LMArena Longer Query14071382

Writing & Preference GPT-5.4 mini leads

GPT-5.4 mini: 64.0 (#58), Muse Glimmer: 57.5 (#126)

BenchmarkGPT-5.4 miniMuse Glimmer
LMArena Text14121389
LMArena Creative Writing13701339
LMArena Multi-Turn14291399
EQ-Bench Creative Writing1665—

Frequently asked questions

Is GPT-5.4 mini better than Muse Glimmer?

GPT-5.4 mini is the stronger model overall, scoring 45.0 to 41.7 on the Noometry Index.

Is GPT-5.4 mini or Muse Glimmer better for coding?

GPT-5.4 mini scores higher on coding benchmarks: 45.2 versus 40.4 in the Noometry coding category.

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

15 benchmarks have published results for both models. GPT-5.4 mini has 46 scored results on Noometry and Muse Glimmer has 15.

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