Noometry

Model comparison

Kimi K2.5 Instant vs Muse Spark 1.3

Muse Spark 1.3 is the stronger model overall, scoring 54.8 to 43.6 on the Noometry Index.

Last verified . 18 shared benchmarks.

Kimi K2.5 Instant Moonshot AI

43.6

Rank #89 Confirmed

Muse Spark 1.3 Meta

54.8

Rank #27 Confirmed

Summary

  • They share 18 benchmarks with published results for both. Kimi K2.5 Instant scores higher in 0 categories and Muse Spark 1.3 in 9 categories; 9 gaps are clear of the uncertainty.
  • The widest gap is in math, where Muse Spark 1.3 leads 73.1 to 39.4.
  • Kimi K2.5 Instant has downloadable open weights; the other is API-only.

Side by side

Kimi K2.5 InstantMuse Spark 1.3
ProviderMoonshot AIMeta
Noometry Index43.654.8
Released—2026-09-02
WeightsOpenProprietary
Context window—1.05M
Max output—131K
Input $ / M tokens—$1.25
Output $ / M tokens—$4.25
Results tracked1837

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Category by category

Coding Muse Spark 1.3 leads

Kimi K2.5 Instant: 42.6 (#97), Muse Spark 1.3: 56.6 (#21)

BenchmarkKimi K2.5 InstantMuse Spark 1.3
LMArena WebDev14041657
LMArena Coding14841514
CursorBench—41.6%
SciCode—59.7%

Agentic & Tool Use Not comparable

Kimi K2.5 Instant: —, Muse Spark 1.3: 38.6 (#30)

BenchmarkKimi K2.5 InstantMuse Spark 1.3
APEX-Agents—57.8%
GDP.pdf—27.6%

Reasoning Muse Spark 1.3 leads

Kimi K2.5 Instant: 29.7 (#90), Muse Spark 1.3: 54.0 (#27)

BenchmarkKimi K2.5 InstantMuse Spark 1.3
LMArena Hard Prompts14431503
NYT Connections (extended)—85.1%
CritPt—26%
Chess Puzzles—38%
Mystery Game Puzzles—25%
DTBench—96.5%
LMCA—53.9%
Bench to the Future 3—0.14
Epoch Capabilities Index—156.75

Math Muse Spark 1.3 leads

Kimi K2.5 Instant: 39.4 (#105), Muse Spark 1.3: 73.1 (#21)

BenchmarkKimi K2.5 InstantMuse Spark 1.3
LMArena Math14421494
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

Kimi K2.5 Instant: 40.2 (#123), Muse Spark 1.3: 42.6 (#95)

BenchmarkKimi K2.5 InstantMuse Spark 1.3
LMArena Expert14401516

Multimodal Muse Spark 1.3 leads

Kimi K2.5 Instant: 40.2 (#50), Muse Spark 1.3: 43.7 (#22)

BenchmarkKimi K2.5 InstantMuse Spark 1.3
LMArena Vision12541309
LMArena Document—1471

Multilingual Muse Spark 1.3 leads

Kimi K2.5 Instant: 52.0 (#94), Muse Spark 1.3: 57.4 (#8)

BenchmarkKimi K2.5 InstantMuse Spark 1.3
LMArena Non-English14061481
LMArena Chinese14491529
LMArena French14031524
LMArena German14131515
LMArena Korean13781501
LMArena Russian14041490
LMArena Spanish14471490
LMArena Japanese—1474

Instruction Following Muse Spark 1.3 leads

Kimi K2.5 Instant: 75.3 (#65), Muse Spark 1.3: 77.5 (#22)

BenchmarkKimi K2.5 InstantMuse Spark 1.3
LMArena Instruction Following14301477

Long Context Muse Spark 1.3 leads

Kimi K2.5 Instant: 43.9 (#83), Muse Spark 1.3: 45.6 (#32)

BenchmarkKimi K2.5 InstantMuse Spark 1.3
LMArena Longer Query14351488

Writing & Preference Muse Spark 1.3 leads

Kimi K2.5 Instant: 60.6 (#95), Muse Spark 1.3: 73.6 (#9)

BenchmarkKimi K2.5 InstantMuse Spark 1.3
LMArena Text14201490
LMArena Creative Writing13811455
LMArena Multi-Turn14271482
EQ-Bench Creative Writing—1906

Frequently asked questions

Is Kimi K2.5 Instant better than Muse Spark 1.3?

Muse Spark 1.3 is the stronger model overall, scoring 54.8 to 43.6 on the Noometry Index.

Is Kimi K2.5 Instant or Muse Spark 1.3 better for coding?

Muse Spark 1.3 scores higher on coding benchmarks: 56.6 versus 42.6 in the Noometry coding category.

How many benchmarks do Kimi K2.5 Instant and Muse Spark 1.3 share?

18 benchmarks have published results for both models. Kimi K2.5 Instant has 18 scored results on Noometry and Muse Spark 1.3 has 37.

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