Noometry

Model comparison

Grok 4.5 vs Muse Glimmer

Grok 4.5 is the stronger model overall, scoring 55.0 to 41.7 on the Noometry Index.

Last verified . 15 shared benchmarks.

Grok 4.5 xAI

55.0

Rank #25 Confirmed

Muse Glimmer Meta

41.7

Rank #131 Confirmed

Summary

  • They share 15 benchmarks with published results for both. Grok 4.5 scores higher in 8 categories and Muse Glimmer in 0 categories; 8 gaps are clear of the uncertainty.
  • The widest gap is in reasoning, where Grok 4.5 leads 56.1 to 25.7.
  • The biggest single-benchmark swing is CritPt: 15.4% for Grok 4.5 and 2.6% for Muse Glimmer.
  • Muse Glimmer has downloadable open weights; the other is API-only.

Side by side

Grok 4.5Muse Glimmer
ProviderxAIMeta
Noometry Index55.041.7
Released2026-07-082026-08-10
WeightsProprietaryOpen
Context window500K—
Max output500K—
Input $ / M tokens$2—
Output $ / M tokens$6—
Results tracked5215

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Category by category

Coding Grok 4.5 leads

Grok 4.5: 52.2 (#35), Muse Glimmer: 40.4 (#142)

BenchmarkGrok 4.5Muse Glimmer
LMArena WebDev15531355
SciCode54.1%44.9%
LMArena Coding14741416
DeepSWE53.8%—
FrontierCode42.4%—
WeirdML46.4%—
ALE-Bench1,309—

Agentic & Tool Use Not comparable

Grok 4.5: 44.4 (#17), Muse Glimmer: —

BenchmarkGrok 4.5Muse Glimmer
APEX-Agents56.2%—
τ²-bench Banking47.9%—
PostTrainBench23.4%—
GBAEval65.4%—
GDP.pdf14%—
LMArena Search1213—
Vending-Bench 23,887—

Reasoning Grok 4.5 leads

Grok 4.5: 56.1 (#25), Muse Glimmer: 25.7 (#144)

BenchmarkGrok 4.5Muse Glimmer
CritPt15.4%2.6%
LMArena Hard Prompts14621396
ARC-AGI-252.6%—
SimpleBench70%—
Kagi LLM Benchmark83.5%—
NYT Connections (extended)79.9%—
ARC-AGI-187.2%—
Chess Puzzles36%—
DTBench96.5%—
LMCA45.2%—
Surface Evolver Bench74.4%—
Epoch Capabilities Index153.92—

Math Grok 4.5 leads

Grok 4.5: 60.9 (#35), Muse Glimmer: 38.8 (#125)

BenchmarkGrok 4.5Muse Glimmer
LMArena Math14591417
FrontierMath (Tiers 1-3)57.2%—
FrontierMath Tier 424.4%—
OTIS Mock AIME 2024-202597.8%—
ProofBench31%—

Knowledge Grok 4.5 leads

Grok 4.5: 62.3 (#24), Muse Glimmer: 38.5 (#143)

BenchmarkGrok 4.5Muse Glimmer
LMArena Expert14661386
GPQA Diamond93.4%—
SimpleQA Verified48.3%—

Multimodal Not comparable

Grok 4.5: 37.6 (#72), Muse Glimmer: —

BenchmarkGrok 4.5Muse Glimmer
LMArena Vision1288—
Blueprint-Bench 227.3%—
Furniture Assembly22.5%—
LMArena Document1452—

Multilingual Grok 4.5 leads

Grok 4.5: 54.4 (#42), Muse Glimmer: 50.5 (#122)

BenchmarkGrok 4.5Muse Glimmer
LMArena Non-English14401384
LMArena Chinese14961412
LMArena Russian14481390
LMArena French1456—
LMArena German1446—
LMArena Japanese1428—
LMArena Korean1404—
LMArena Spanish1450—

Instruction Following Grok 4.5 leads

Grok 4.5: 76.0 (#48), Muse Glimmer: 72.6 (#135)

BenchmarkGrok 4.5Muse Glimmer
LMArena Instruction Following14461375

Long Context Grok 4.5 leads

Grok 4.5: 44.8 (#56), Muse Glimmer: 42.1 (#129)

BenchmarkGrok 4.5Muse Glimmer
LMArena Longer Query14631382

Writing & Preference Grok 4.5 leads

Grok 4.5: 65.8 (#42), Muse Glimmer: 57.5 (#126)

BenchmarkGrok 4.5Muse Glimmer
LMArena Text14481389
LMArena Creative Writing14421339
LMArena Multi-Turn14561399
EQ-Bench Creative Writing1579—

Frequently asked questions

Is Grok 4.5 better than Muse Glimmer?

Grok 4.5 is the stronger model overall, scoring 55.0 to 41.7 on the Noometry Index.

Is Grok 4.5 or Muse Glimmer better for coding?

Grok 4.5 scores higher on coding benchmarks: 52.2 versus 40.4 in the Noometry coding category.

How many benchmarks do Grok 4.5 and Muse Glimmer share?

15 benchmarks have published results for both models. Grok 4.5 has 52 scored results on Noometry and Muse Glimmer has 15.

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