Noometry

Model comparison

Grok 4.1 Fast vs Muse Glimmer

Grok 4.1 Fast and Muse Glimmer score almost the same on the Noometry Index (41.4 vs 41.7), so choose on price, context window or the category you care about most.

Last verified . 13 shared benchmarks.

Grok 4.1 Fast xAI

41.4

Rank #136 Confirmed

Muse Glimmer Meta

41.7

Rank #131 Confirmed

Summary

  • They share 13 benchmarks with published results for both. Grok 4.1 Fast scores higher in 4 categories and Muse Glimmer in 4 categories; 4 gaps are clear of the uncertainty.
  • The widest gap is in reasoning, where Grok 4.1 Fast leads 43.4 to 25.7.
  • Muse Glimmer has downloadable open weights; the other is API-only.

Side by side

Grok 4.1 FastMuse Glimmer
ProviderxAIMeta
Noometry Index41.441.7
Released2025-06-272026-08-10
WeightsProprietaryOpen
Context window128K—
Max output30K—
Input $ / M tokens$0.20—
Output $ / M tokens$0.50—
Results tracked3215

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Category by category

Coding Muse Glimmer leads

Grok 4.1 Fast: 34.1 (#245), Muse Glimmer: 40.4 (#142)

BenchmarkGrok 4.1 FastMuse Glimmer
LMArena WebDev12421355
LMArena Coding14111416
SciCode—44.9%
ALE-Bench394.93—

Agentic & Tool Use Not comparable

Grok 4.1 Fast: 36.3 (#39), Muse Glimmer: —

BenchmarkGrok 4.1 FastMuse Glimmer
Berkeley Function Calling Leaderboard69.6%—
τ²-bench Banking13.1%—
LMArena Search1171—
Vending-Bench 21,107—

Reasoning Grok 4.1 Fast leads

Grok 4.1 Fast: 43.4 (#49), Muse Glimmer: 25.7 (#144)

BenchmarkGrok 4.1 FastMuse Glimmer
LMArena Hard Prompts14071396
SimpleBench56%—
NYT Connections (extended)87.4%—
CritPt—2.6%
DTBench87.7%—
ForecastBench61—

Math Muse Glimmer leads

Grok 4.1 Fast: 31.9 (#221), Muse Glimmer: 38.8 (#125)

BenchmarkGrok 4.1 FastMuse Glimmer
LMArena Math14081417
MathArena Final-Answer Competitions60.9%—
ProofBench4%—

Knowledge Muse Glimmer leads

Grok 4.1 Fast: 33.1 (#207), Muse Glimmer: 38.5 (#143)

BenchmarkGrok 4.1 FastMuse Glimmer
LMArena Expert13991386
Vectara Hallucination Rate17.8%—

Multimodal Not comparable

Grok 4.1 Fast: 37.0 (#76), Muse Glimmer: —

BenchmarkGrok 4.1 FastMuse Glimmer
LMArena Vision1201—

Multilingual Too close to call

Grok 4.1 Fast: 51.0 (#114), Muse Glimmer: 50.5 (#122)

BenchmarkGrok 4.1 FastMuse Glimmer
LMArena Non-English13911384
LMArena Chinese14411412
LMArena Russian13871390
LMArena French1415—
LMArena German1404—
LMArena Japanese1349—
LMArena Korean1361—
LMArena Spanish1413—

Instruction Following Too close to call

Grok 4.1 Fast: 72.7 (#133), Muse Glimmer: 72.6 (#135)

BenchmarkGrok 4.1 FastMuse Glimmer
LMArena Instruction Following13761375

Long Context Too close to call

Grok 4.1 Fast: 42.4 (#126), Muse Glimmer: 42.1 (#129)

BenchmarkGrok 4.1 FastMuse Glimmer
LMArena Longer Query13901382

Writing & Preference Too close to call

Grok 4.1 Fast: 57.2 (#131), Muse Glimmer: 57.5 (#126)

BenchmarkGrok 4.1 FastMuse Glimmer
LMArena Text14081389
LMArena Creative Writing13941339
LMArena Multi-Turn13891399
EQ-Bench Creative Writing1327—

Frequently asked questions

Is Grok 4.1 Fast better than Muse Glimmer?

Grok 4.1 Fast and Muse Glimmer score almost the same on the Noometry Index (41.4 vs 41.7), so choose on price, context window or the category you care about most.

Is Grok 4.1 Fast or Muse Glimmer better for coding?

Muse Glimmer scores higher on coding benchmarks: 40.4 versus 34.1 in the Noometry coding category.

How many benchmarks do Grok 4.1 Fast and Muse Glimmer share?

13 benchmarks have published results for both models. Grok 4.1 Fast has 32 scored results on Noometry and Muse Glimmer has 15.

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