Noometry

Model comparison

GPT-6 Luna vs Kimi K2.5 Instant

GPT-6 Luna is the stronger model overall, scoring 53.3 to 43.6 on the Noometry Index.

Last verified . 18 shared benchmarks.

GPT-6 Luna OpenAI

53.3

Rank #36 Confirmed

Kimi K2.5 Instant Moonshot AI

43.6

Rank #89 Confirmed

Summary

  • They share 18 benchmarks with published results for both. GPT-6 Luna scores higher in 5 categories and Kimi K2.5 Instant in 4 categories; 8 gaps are clear of the uncertainty.
  • The widest gap is in math, where GPT-6 Luna leads 76.1 to 39.4.
  • Kimi K2.5 Instant has downloadable open weights; the other is API-only.

Side by side

GPT-6 LunaKimi K2.5 Instant
ProviderOpenAIMoonshot AI
Noometry Index53.343.6
Released2026-09-22—
WeightsProprietaryOpen
Context window1.05M—
Max output128K—
Input $ / M tokens$0.10—
Output $ / M tokens$0.50—
Results tracked4218

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Category by category

Coding GPT-6 Luna leads

GPT-6 Luna: 55.5 (#25), Kimi K2.5 Instant: 42.6 (#97)

BenchmarkGPT-6 LunaKimi K2.5 Instant
LMArena WebDev15811404
LMArena Coding14391484
DeepSWE66.6%—
FrontierCode42.4%—
SciCode54.6%—
ALE-Bench1,577—

Agentic & Tool Use Not comparable

GPT-6 Luna: 33.3 (#54), Kimi K2.5 Instant: —

BenchmarkGPT-6 LunaKimi K2.5 Instant
APEX-Agents44.3%—
GDP.pdf23%—

Reasoning GPT-6 Luna leads

GPT-6 Luna: 48.2 (#41), Kimi K2.5 Instant: 29.7 (#90)

BenchmarkGPT-6 LunaKimi K2.5 Instant
LMArena Hard Prompts14111443
ARC-AGI-259.3%—
NYT Connections (extended)68.7%—
ARC-AGI-186.7%—
CritPt19.4%—
Chess Puzzles31%—
Mystery Game Puzzles7%—
DTBench90.1%—
LMCA44.5%—
Epoch Capabilities Index156.28—

Math GPT-6 Luna leads

GPT-6 Luna: 76.1 (#15), Kimi K2.5 Instant: 39.4 (#105)

BenchmarkGPT-6 LunaKimi K2.5 Instant
LMArena Math14161442
FrontierMath (Tiers 1-3)78.9%—
FrontierMath Tier 456.1%—
OTIS Mock AIME 2024-202598.9%—
ProofBench64%—

Knowledge GPT-6 Luna leads

GPT-6 Luna: 57.0 (#41), Kimi K2.5 Instant: 40.2 (#123)

BenchmarkGPT-6 LunaKimi K2.5 Instant
LMArena Expert14441440
GPQA Diamond90.5%—
SimpleQA Verified41.4%—

Multimodal GPT-6 Luna leads

GPT-6 Luna: 42.4 (#30), Kimi K2.5 Instant: 40.2 (#50)

BenchmarkGPT-6 LunaKimi K2.5 Instant
LMArena Vision12171254
Blueprint-Bench 231.2%—
Furniture Assembly44.2%—

Multilingual Kimi K2.5 Instant leads

GPT-6 Luna: 50.5 (#117), Kimi K2.5 Instant: 52.0 (#94)

BenchmarkGPT-6 LunaKimi K2.5 Instant
LMArena Non-English13861406
LMArena Chinese14331449
LMArena French14201403
LMArena German13691413
LMArena Korean13601378
LMArena Russian13941404
LMArena Spanish13931447
LMArena Japanese1369—

Instruction Following Kimi K2.5 Instant leads

GPT-6 Luna: 74.3 (#99), Kimi K2.5 Instant: 75.3 (#65)

BenchmarkGPT-6 LunaKimi K2.5 Instant
LMArena Instruction Following14091430

Long Context Too close to call

GPT-6 Luna: 43.0 (#111), Kimi K2.5 Instant: 43.9 (#83)

BenchmarkGPT-6 LunaKimi K2.5 Instant
LMArena Longer Query14091435

Writing & Preference Kimi K2.5 Instant leads

GPT-6 Luna: 58.3 (#119), Kimi K2.5 Instant: 60.6 (#95)

BenchmarkGPT-6 LunaKimi K2.5 Instant
LMArena Text13911420
LMArena Creative Writing13631381
LMArena Multi-Turn13961427

Frequently asked questions

Is GPT-6 Luna better than Kimi K2.5 Instant?

GPT-6 Luna is the stronger model overall, scoring 53.3 to 43.6 on the Noometry Index.

Is GPT-6 Luna or Kimi K2.5 Instant better for coding?

GPT-6 Luna scores higher on coding benchmarks: 55.5 versus 42.6 in the Noometry coding category.

How many benchmarks do GPT-6 Luna and Kimi K2.5 Instant share?

18 benchmarks have published results for both models. GPT-6 Luna has 42 scored results on Noometry and Kimi K2.5 Instant has 18.

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