Noometry

Model comparison

GPT-5.5 Instant vs Kimi K3

Kimi K3 is the stronger model overall, scoring 59.5 to 42.7 on the Noometry Index.

Last verified . 25 shared benchmarks.

GPT-5.5 Instant OpenAI

42.7

Rank #110 Confirmed

Kimi K3 Moonshot AI

59.5

Rank #15 Confirmed

Summary

  • They share 25 benchmarks with published results for both. GPT-5.5 Instant scores higher in 1 category and Kimi K3 in 8 categories; 9 gaps are clear of the uncertainty.
  • The widest gap is in math, where Kimi K3 leads 74.2 to 26.5.
  • The biggest single-benchmark swing is FrontierMath (Tiers 1-3): 26.3% for GPT-5.5 Instant and 72.2% for Kimi K3.
  • Kimi K3 has downloadable open weights; the other is API-only.

Side by side

GPT-5.5 InstantKimi K3
ProviderOpenAIMoonshot AI
Noometry Index42.759.5
Released2026-05-052026-07-16
WeightsProprietaryOpen
Context window—1.05M
Max output—1.05M
Input $ / M tokens—$3
Output $ / M tokens—$15
Results tracked2753

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Category by category

Coding Kimi K3 leads

GPT-5.5 Instant: 44.3 (#74), Kimi K3: 61.0 (#10)

BenchmarkGPT-5.5 InstantKimi K3
SciCode48.6%59.5%
LMArena Coding14331508
DeepSWE—68.5%
FrontierCode—44.2%
LMArena WebDev—1654
FrontierSWE—25.9%
WeirdML—82.6%
ALE-Bench—1,524

Agentic & Tool Use Not comparable

GPT-5.5 Instant: —, Kimi K3: 41.8 (#20)

BenchmarkGPT-5.5 InstantKimi K3
APEX-Agents—50.6%
τ²-bench Banking—37.1%
PostTrainBench—32%
GBAEval—48.3%
GDP.pdf—19%
Vending-Bench 2—5,165

Reasoning Kimi K3 leads

GPT-5.5 Instant: 24.9 (#155), Kimi K3: 63.0 (#17)

BenchmarkGPT-5.5 InstantKimi K3
CritPt0%23.4%
Chess Puzzles12%39%
LMArena Hard Prompts14261496
Epoch Capabilities Index142.52157.45
ARC-AGI-2—60.4%
SimpleBench—60.7%
NYT Connections (extended)—93.6%
ARC-AGI-1—94.5%
Mystery Game Puzzles—26%
DTBench—91.2%
LMCA—52.7%
Surface Evolver Bench—95%
ForecastBench—61.1

Math Kimi K3 leads

GPT-5.5 Instant: 26.5 (#259), Kimi K3: 74.2 (#16)

BenchmarkGPT-5.5 InstantKimi K3
FrontierMath (Tiers 1-3)26.3%72.2%
FrontierMath Tier 42.4%39%
OTIS Mock AIME 2024-202568.1%97.2%
LMArena Math14201491
MathArena Final-Answer Competitions—87.8%
ProofBench—87%

Knowledge Kimi K3 leads

GPT-5.5 Instant: 48.9 (#74), Kimi K3: 63.2 (#21)

BenchmarkGPT-5.5 InstantKimi K3
GPQA Diamond82.5%93.1%
LMArena Expert14091521
SimpleQA Verified—50.6%

Multimodal GPT-5.5 Instant leads

GPT-5.5 Instant: 40.0 (#52), Kimi K3: 37.8 (#70)

BenchmarkGPT-5.5 InstantKimi K3
LMArena Vision1250—
Blueprint-Bench 2—29.5%
Furniture Assembly—34.2%
LMArena Document1403—

Multilingual Kimi K3 leads

GPT-5.5 Instant: 52.8 (#80), Kimi K3: 56.3 (#21)

BenchmarkGPT-5.5 InstantKimi K3
LMArena Non-English14171466
LMArena Chinese14561529
LMArena French14281491
LMArena German14111488
LMArena Japanese14081487
LMArena Korean13921458
LMArena Russian14311482
LMArena Spanish14291472

Instruction Following Kimi K3 leads

GPT-5.5 Instant: 74.2 (#100), Kimi K3: 77.7 (#14)

BenchmarkGPT-5.5 InstantKimi K3
LMArena Instruction Following14061483

Long Context Kimi K3 leads

GPT-5.5 Instant: 43.4 (#96), Kimi K3: 45.8 (#29)

BenchmarkGPT-5.5 InstantKimi K3
LMArena Longer Query14221494

Writing & Preference Kimi K3 leads

GPT-5.5 Instant: 61.8 (#85), Kimi K3: 76.6 (#4)

BenchmarkGPT-5.5 InstantKimi K3
LMArena Text14191476
LMArena Creative Writing14191454
LMArena Multi-Turn14331488
EQ-Bench Creative Writing—2082
EQ-Bench 4—1339

Frequently asked questions

Is GPT-5.5 Instant better than Kimi K3?

Kimi K3 is the stronger model overall, scoring 59.5 to 42.7 on the Noometry Index.

Is GPT-5.5 Instant or Kimi K3 better for coding?

Kimi K3 scores higher on coding benchmarks: 61.0 versus 44.3 in the Noometry coding category.

How many benchmarks do GPT-5.5 Instant and Kimi K3 share?

25 benchmarks have published results for both models. GPT-5.5 Instant has 27 scored results on Noometry and Kimi K3 has 53.

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