Noometry

Model comparison

Grok 4 Fast vs Muse Spark 1.3

Muse Spark 1.3 is the stronger model overall, scoring 54.8 to 39.4 on the Noometry Index.

Last verified . 20 shared benchmarks.

Grok 4 Fast xAI

39.4

Rank #167 Confirmed

Muse Spark 1.3 Meta

54.8

Rank #27 Confirmed

Summary

  • They share 20 benchmarks with published results for both. Grok 4 Fast scores higher in 1 category and Muse Spark 1.3 in 8 categories; 9 gaps are clear of the uncertainty.
  • The widest gap is in math, where Muse Spark 1.3 leads 73.1 to 38.9.
  • The biggest single-benchmark swing is DTBench: 82.7% for Grok 4 Fast and 96.5% for Muse Spark 1.3.

Side by side

Grok 4 FastMuse Spark 1.3
ProviderxAIMeta
Noometry Index39.454.8
Released2025-09-192026-09-02
WeightsProprietaryProprietary
Context window—1.05M
Max output—131K
Input $ / M tokens—$1.25
Output $ / M tokens—$4.25
Results tracked3037

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Category by category

Coding Muse Spark 1.3 leads

Grok 4 Fast: 32.5 (#271), Muse Spark 1.3: 56.6 (#21)

BenchmarkGrok 4 FastMuse Spark 1.3
LMArena WebDev11591657
LMArena Coding14291514
CursorBench—41.6%
SciCode—59.7%
WeirdML42.9%—

Agentic & Tool Use Muse Spark 1.3 leads

Grok 4 Fast: 29.5 (#86), Muse Spark 1.3: 38.6 (#30)

BenchmarkGrok 4 FastMuse Spark 1.3
APEX-Agents—57.8%
τ²-bench Banking15.7%—
Cybench30%—
GDP.pdf—27.6%
LMArena Search1171—

Reasoning Muse Spark 1.3 leads

Grok 4 Fast: 22.2 (#201), Muse Spark 1.3: 54.0 (#27)

BenchmarkGrok 4 FastMuse Spark 1.3
LMArena Hard Prompts14121503
DTBench82.7%96.5%
Epoch Capabilities Index144.2156.75
ARC-AGI-25.3%—
Kagi LLM Benchmark66.1%—
NYT Connections (extended)—85.1%
ARC-AGI-148.5%—
CritPt—26%
Chess Puzzles—38%
Mystery Game Puzzles—25%
LMCA—53.9%
Bench to the Future 3—0.14
ForecastBench60.5—

Math Muse Spark 1.3 leads

Grok 4 Fast: 38.9 (#123), Muse Spark 1.3: 73.1 (#21)

BenchmarkGrok 4 FastMuse Spark 1.3
LMArena Math14191494
FrontierMath (Tiers 1-3)—74.4%
FrontierMath Tier 4—46.3%
OTIS Mock AIME 2024-2025—99.2%
ProofBench—58%

Knowledge Muse Spark 1.3 leads

Grok 4 Fast: 32.0 (#214), Muse Spark 1.3: 42.6 (#95)

BenchmarkGrok 4 FastMuse Spark 1.3
LMArena Expert14111516
Vectara Hallucination Rate19.7%—

Multimodal Not comparable

Grok 4 Fast: —, Muse Spark 1.3: 43.7 (#22)

BenchmarkGrok 4 FastMuse Spark 1.3
LMArena Vision—1309
LMArena Document—1471

Multilingual Muse Spark 1.3 leads

Grok 4 Fast: 51.3 (#111), Muse Spark 1.3: 57.4 (#8)

BenchmarkGrok 4 FastMuse Spark 1.3
LMArena Non-English13961481
LMArena Chinese14571529
LMArena French14311524
LMArena German13831515
LMArena Japanese13521474
LMArena Korean13571501
LMArena Russian13891490
LMArena Spanish14151490

Instruction Following Muse Spark 1.3 leads

Grok 4 Fast: 73.2 (#121), Muse Spark 1.3: 77.5 (#22)

BenchmarkGrok 4 FastMuse Spark 1.3
LMArena Instruction Following13871477

Long Context Grok 4 Fast leads

Grok 4 Fast: 63.2 (#3), Muse Spark 1.3: 45.6 (#32)

BenchmarkGrok 4 FastMuse Spark 1.3
LMArena Longer Query14151488
Fiction.LiveBench94.4%—

Writing & Preference Muse Spark 1.3 leads

Grok 4 Fast: 60.0 (#102), Muse Spark 1.3: 73.6 (#9)

BenchmarkGrok 4 FastMuse Spark 1.3
LMArena Text14071490
LMArena Creative Writing13871455
LMArena Multi-Turn14141482
EQ-Bench Creative Writing—1906

Frequently asked questions

Is Grok 4 Fast better than Muse Spark 1.3?

Muse Spark 1.3 is the stronger model overall, scoring 54.8 to 39.4 on the Noometry Index.

Is Grok 4 Fast or Muse Spark 1.3 better for coding?

Muse Spark 1.3 scores higher on coding benchmarks: 56.6 versus 32.5 in the Noometry coding category.

How many benchmarks do Grok 4 Fast and Muse Spark 1.3 share?

20 benchmarks have published results for both models. Grok 4 Fast has 30 scored results on Noometry and Muse Spark 1.3 has 37.

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