Noometry

Model comparison

GPT-5.5 Instant vs Muse Spark 1.3

Muse Spark 1.3 is the stronger model overall, scoring 54.8 to 42.7 on the Noometry Index.

Last verified . 26 shared benchmarks.

GPT-5.5 Instant OpenAI

42.7

Rank #110 Confirmed

Muse Spark 1.3 Meta

54.8

Rank #27 Confirmed

Summary

  • They share 26 benchmarks with published results for both. GPT-5.5 Instant 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 26.5.
  • The biggest single-benchmark swing is FrontierMath (Tiers 1-3): 26.3% for GPT-5.5 Instant and 74.4% for Muse Spark 1.3.

Side by side

GPT-5.5 InstantMuse Spark 1.3
ProviderOpenAIMeta
Noometry Index42.754.8
Released2026-05-052026-09-02
WeightsProprietaryProprietary
Context window—1.05M
Max output—131K
Input $ / M tokens—$1.25
Output $ / M tokens—$4.25
Results tracked2737

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Category by category

Coding Muse Spark 1.3 leads

GPT-5.5 Instant: 44.3 (#74), Muse Spark 1.3: 56.6 (#21)

BenchmarkGPT-5.5 InstantMuse Spark 1.3
SciCode48.6%59.7%
LMArena Coding14331514
CursorBench—41.6%
LMArena WebDev—1657

Agentic & Tool Use Not comparable

GPT-5.5 Instant: —, Muse Spark 1.3: 38.6 (#30)

BenchmarkGPT-5.5 InstantMuse Spark 1.3
APEX-Agents—57.8%
GDP.pdf—27.6%

Reasoning Muse Spark 1.3 leads

GPT-5.5 Instant: 24.9 (#155), Muse Spark 1.3: 54.0 (#27)

BenchmarkGPT-5.5 InstantMuse Spark 1.3
CritPt0%26%
Chess Puzzles12%38%
LMArena Hard Prompts14261503
Epoch Capabilities Index142.52156.75
NYT Connections (extended)—85.1%
Mystery Game Puzzles—25%
DTBench—96.5%
LMCA—53.9%
Bench to the Future 3—0.14

Math Muse Spark 1.3 leads

GPT-5.5 Instant: 26.5 (#259), Muse Spark 1.3: 73.1 (#21)

BenchmarkGPT-5.5 InstantMuse Spark 1.3
FrontierMath (Tiers 1-3)26.3%74.4%
FrontierMath Tier 42.4%46.3%
OTIS Mock AIME 2024-202568.1%99.2%
LMArena Math14201494
ProofBench—58%

Knowledge GPT-5.5 Instant leads

GPT-5.5 Instant: 48.9 (#74), Muse Spark 1.3: 42.6 (#95)

BenchmarkGPT-5.5 InstantMuse Spark 1.3
LMArena Expert14091516
GPQA Diamond82.5%—

Multimodal Muse Spark 1.3 leads

GPT-5.5 Instant: 40.0 (#52), Muse Spark 1.3: 43.7 (#22)

BenchmarkGPT-5.5 InstantMuse Spark 1.3
LMArena Vision12501309
LMArena Document14031471

Multilingual Muse Spark 1.3 leads

GPT-5.5 Instant: 52.8 (#80), Muse Spark 1.3: 57.4 (#8)

BenchmarkGPT-5.5 InstantMuse Spark 1.3
LMArena Non-English14171481
LMArena Chinese14561529
LMArena French14281524
LMArena German14111515
LMArena Japanese14081474
LMArena Korean13921501
LMArena Russian14311490
LMArena Spanish14291490

Instruction Following Muse Spark 1.3 leads

GPT-5.5 Instant: 74.2 (#100), Muse Spark 1.3: 77.5 (#22)

BenchmarkGPT-5.5 InstantMuse Spark 1.3
LMArena Instruction Following14061477

Long Context Muse Spark 1.3 leads

GPT-5.5 Instant: 43.4 (#96), Muse Spark 1.3: 45.6 (#32)

BenchmarkGPT-5.5 InstantMuse Spark 1.3
LMArena Longer Query14221488

Writing & Preference Muse Spark 1.3 leads

GPT-5.5 Instant: 61.8 (#85), Muse Spark 1.3: 73.6 (#9)

BenchmarkGPT-5.5 InstantMuse Spark 1.3
LMArena Text14191490
LMArena Creative Writing14191455
LMArena Multi-Turn14331482
EQ-Bench Creative Writing—1906

Frequently asked questions

Is GPT-5.5 Instant better than Muse Spark 1.3?

Muse Spark 1.3 is the stronger model overall, scoring 54.8 to 42.7 on the Noometry Index.

Is GPT-5.5 Instant or Muse Spark 1.3 better for coding?

Muse Spark 1.3 scores higher on coding benchmarks: 56.6 versus 44.3 in the Noometry coding category.

How many benchmarks do GPT-5.5 Instant and Muse Spark 1.3 share?

26 benchmarks have published results for both models. GPT-5.5 Instant has 27 scored results on Noometry and Muse Spark 1.3 has 37.

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