Noometry

Model comparison

Claude Opus 4.1 vs Kimi K2.5 Instant

Kimi K2.5 Instant is the stronger model overall, scoring 43.6 to 41.0 on the Noometry Index.

Last verified . 17 shared benchmarks.

Claude Opus 4.1 Anthropic

41.0

Rank #142 Confirmed

Kimi K2.5 Instant Moonshot AI

43.6

Rank #89 Confirmed

Summary

  • They share 17 benchmarks with published results for both. Claude Opus 4.1 scores higher in 6 categories and Kimi K2.5 Instant in 3 categories; 6 gaps are clear of the uncertainty.
  • The widest gap is in math, where Kimi K2.5 Instant leads 39.4 to 22.3.
  • Kimi K2.5 Instant has downloadable open weights; the other is API-only.

Side by side

Claude Opus 4.1Kimi K2.5 Instant
ProviderAnthropicMoonshot AI
Noometry Index41.043.6
Released2025-08-05—
WeightsProprietaryOpen
Context window200K—
Max output32K—
Input $ / M tokens$15—
Output $ / M tokens$75—
Results tracked4818

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Category by category

Coding Claude Opus 4.1 leads

Claude Opus 4.1: 44.4 (#73), Kimi K2.5 Instant: 42.6 (#97)

BenchmarkClaude Opus 4.1Kimi K2.5 Instant
LMArena WebDev13901404
LMArena Coding14791484
SWE-bench Verified73.3%—
WeirdML45.9%—
ALE-Bench674.77—
AlgoTune1.34—

Agentic & Tool Use Not comparable

Claude Opus 4.1: 35.0 (#41), Kimi K2.5 Instant: —

BenchmarkClaude Opus 4.1Kimi K2.5 Instant
Terminal-Bench38%—
GDPval43.6%—
Cybench42%—
DeepResearch Bench48.3%—
LMArena Search1148—
METR Time Horizons66.8%—

Reasoning Claude Opus 4.1 leads

Claude Opus 4.1: 32.2 (#76), Kimi K2.5 Instant: 29.7 (#90)

BenchmarkClaude Opus 4.1Kimi K2.5 Instant
LMArena Hard Prompts14431443
SimpleBench60%—
Chess Puzzles7%—
EnigmaEval7.2%—
EBR-Bench7.9%—
Mystery Game Puzzles21%—
DTBench80%—
LMCA37.1%—
Epoch Capabilities Index144.12—
ForecastBench62—

Math Kimi K2.5 Instant leads

Claude Opus 4.1: 22.3 (#277), Kimi K2.5 Instant: 39.4 (#105)

BenchmarkClaude Opus 4.1Kimi K2.5 Instant
LMArena Math14311442
FrontierMath (Tiers 1-3)12.6%—
FrontierMath Tier 42.4%—
OTIS Mock AIME 2024-202568.9%—
FrontierMath (Feb 2025 set)7.2%—
FrontierMath Tier 4 (v1)4.2%—

Knowledge Claude Opus 4.1 leads

Claude Opus 4.1: 42.0 (#101), Kimi K2.5 Instant: 40.2 (#123)

BenchmarkClaude Opus 4.1Kimi K2.5 Instant
LMArena Expert14391440
GPQA Diamond77.3%—
Humanity's Last Exam11.5%—
Confabulations17.1%—
Vectara Hallucination Rate11.8%—

Multimodal Kimi K2.5 Instant leads

Claude Opus 4.1: 26.8 (#119), Kimi K2.5 Instant: 40.2 (#50)

BenchmarkClaude Opus 4.1Kimi K2.5 Instant
LMArena Vision—1254
VPCT35%—

Multilingual Too close to call

Claude Opus 4.1: 52.0 (#95), Kimi K2.5 Instant: 52.0 (#94)

BenchmarkClaude Opus 4.1Kimi K2.5 Instant
LMArena Non-English14051406
LMArena Chinese14271449
LMArena French14311403
LMArena German14131413
LMArena Korean13801378
LMArena Russian14221404
LMArena Spanish14481447
LMArena Japanese1378—

Instruction Following Too close to call

Claude Opus 4.1: 75.6 (#58), Kimi K2.5 Instant: 75.3 (#65)

BenchmarkClaude Opus 4.1Kimi K2.5 Instant
LMArena Instruction Following14351430

Long Context Too close to call

Claude Opus 4.1: 44.5 (#63), Kimi K2.5 Instant: 43.9 (#83)

BenchmarkClaude Opus 4.1Kimi K2.5 Instant
LMArena Longer Query14551435

Writing & Preference Claude Opus 4.1 leads

Claude Opus 4.1: 62.4 (#74), Kimi K2.5 Instant: 60.6 (#95)

BenchmarkClaude Opus 4.1Kimi K2.5 Instant
LMArena Text14191420
LMArena Creative Writing14121381
LMArena Multi-Turn14441427
Short-Story Creative Writing84.7%—

Frequently asked questions

Is Claude Opus 4.1 better than Kimi K2.5 Instant?

Kimi K2.5 Instant is the stronger model overall, scoring 43.6 to 41.0 on the Noometry Index.

Is Claude Opus 4.1 or Kimi K2.5 Instant better for coding?

Claude Opus 4.1 scores higher on coding benchmarks: 44.4 versus 42.6 in the Noometry coding category.

How many benchmarks do Claude Opus 4.1 and Kimi K2.5 Instant share?

17 benchmarks have published results for both models. Claude Opus 4.1 has 48 scored results on Noometry and Kimi K2.5 Instant has 18.

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