Noometry

Model comparison

Claude Fable 5.1 vs Muse Spark

Claude Fable 5.1 is the stronger model overall, scoring 69.0 to 50.6 on the Noometry Index.

Last verified . 24 shared benchmarks.

Claude Fable 5.1 Anthropic

69.0

Rank #2 Confirmed

Muse Spark Meta

50.6

Rank #46 Confirmed

Summary

  • They share 24 benchmarks with published results for both. Claude Fable 5.1 scores higher in 9 categories and Muse Spark in 0 categories; 9 gaps are clear of the uncertainty.
  • The widest gap is in math, where Claude Fable 5.1 leads 89.6 to 47.8.
  • The biggest single-benchmark swing is ProofBench: 100% for Claude Fable 5.1 and 17% for Muse Spark.

Side by side

Claude Fable 5.1Muse Spark
ProviderAnthropicMeta
Noometry Index69.050.6
Released2026-09-012026-04-08
WeightsProprietaryProprietary
Context window1M—
Max output128K—
Input $ / M tokens$10—
Output $ / M tokens$50—
Results tracked5227

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Category by category

Coding Claude Fable 5.1 leads

Claude Fable 5.1: 74.7 (#1), Muse Spark: 46.2 (#69)

BenchmarkClaude Fable 5.1Muse Spark
SciCode63.1%51.5%
LMArena Coding15281481
FrontierCode50.9%—
CursorBench51.8%—
LMArena WebDev1744—
FrontierSWE56.3%—
GSO88.2%—
WeirdML92.9%—
MirrorCode73.3%—
ALE-Bench2,143—

Agentic & Tool Use Not comparable

Claude Fable 5.1: 50.7 (#5), Muse Spark: —

BenchmarkClaude Fable 5.1Muse Spark
APEX-Agents68.6%—
Remote Labor Index17.9%—
GDP.pdf29.6%—
Vending-Bench 25,422—

Reasoning Claude Fable 5.1 leads

Claude Fable 5.1: 76.7 (#7), Muse Spark: 35.9 (#67)

BenchmarkClaude Fable 5.1Muse Spark
CritPt31.1%11.3%
LMArena Hard Prompts15261474
Epoch Capabilities Index164.7152.04
ARC-AGI-290%—
NYT Connections (extended)90%—
ARC-AGI-197.5%—
Chess Puzzles47%—
EBR-Bench57.1%—
Mystery Game Puzzles58%—
DTBench97.6%—
LMCA65.5%—

Math Claude Fable 5.1 leads

Claude Fable 5.1: 89.6 (#4), Muse Spark: 47.8 (#66)

BenchmarkClaude Fable 5.1Muse Spark
OTIS Mock AIME 2024-2025100%88.9%
ProofBench100%17%
LMArena Math15251455
FrontierMath (Tiers 1-3)90.2%—
FrontierMath Tier 487.8%—
FrontierMath (Feb 2025 set)—39%
FrontierMath Erdős0%—
FrontierMath Tier 4 (v1)—14.6%

Knowledge Claude Fable 5.1 leads

Claude Fable 5.1: 69.6 (#6), Muse Spark: 65.7 (#13)

BenchmarkClaude Fable 5.1Muse Spark
Humanity's Last Exam46.5%40.6%
LMArena Expert15351457
GPQA Diamond—89.8%
SimpleQA Verified70.8%—

Multimodal Claude Fable 5.1 leads

Claude Fable 5.1: 53.9 (#4), Muse Spark: 43.4 (#24)

BenchmarkClaude Fable 5.1Muse Spark
LMArena Vision13181306
LMArena Document15131444
Blueprint-Bench 241.9%—
Furniture Assembly70%—

Multilingual Claude Fable 5.1 leads

Claude Fable 5.1: 59.1 (#3), Muse Spark: 56.1 (#24)

BenchmarkClaude Fable 5.1Muse Spark
LMArena Non-English15071464
LMArena Chinese15861509
LMArena French15251497
LMArena German15001497
LMArena Korean15341459
LMArena Russian15211466
LMArena Spanish15161472
LMArena Japanese1543—

Instruction Following Claude Fable 5.1 leads

Claude Fable 5.1: 79.2 (#6), Muse Spark: 75.9 (#51)

BenchmarkClaude Fable 5.1Muse Spark
LMArena Instruction Following15171442

Long Context Claude Fable 5.1 leads

Claude Fable 5.1: 46.7 (#20), Muse Spark: 44.4 (#69)

BenchmarkClaude Fable 5.1Muse Spark
LMArena Longer Query15221451

Writing & Preference Claude Fable 5.1 leads

Claude Fable 5.1: 79.2 (#2), Muse Spark: 66.0 (#39)

BenchmarkClaude Fable 5.1Muse Spark
LMArena Text15101474
LMArena Creative Writing15071459
LMArena Multi-Turn14921477
EQ-Bench Creative Writing2162—

Frequently asked questions

Is Claude Fable 5.1 better than Muse Spark?

Claude Fable 5.1 is the stronger model overall, scoring 69.0 to 50.6 on the Noometry Index.

Is Claude Fable 5.1 or Muse Spark better for coding?

Claude Fable 5.1 scores higher on coding benchmarks: 74.7 versus 46.2 in the Noometry coding category.

How many benchmarks do Claude Fable 5.1 and Muse Spark share?

24 benchmarks have published results for both models. Claude Fable 5.1 has 52 scored results on Noometry and Muse Spark has 27.

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