Noometry

Model comparison

Claude Opus 4 vs Kimi K2 Thinking Turbo

Kimi K2 Thinking Turbo is the stronger model overall, scoring 45.8 to 43.1 on the Noometry Index.

Last verified . 19 shared benchmarks.

Claude Opus 4 Anthropic

43.1

Rank #100 Confirmed

Kimi K2 Thinking Turbo Moonshot AI

45.8

Rank #70 Confirmed

Summary

  • They share 19 benchmarks with published results for both. Claude Opus 4 scores higher in 3 categories and Kimi K2 Thinking Turbo in 5 categories; 8 gaps are clear of the uncertainty.
  • The widest gap is in coding, where Claude Opus 4 leads 47.2 to 38.4.
  • The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 64.4% for Claude Opus 4 and 83.1% for Kimi K2 Thinking Turbo.
  • Kimi K2 Thinking Turbo has downloadable open weights; the other is API-only.

Side by side

Claude Opus 4Kimi K2 Thinking Turbo
ProviderAnthropicMoonshot AI
Noometry Index43.145.8
Released2025-05-222025-11-06
WeightsProprietaryOpen
Context window200K—
Max output32K—
Input $ / M tokens$15—
Output $ / M tokens$75—
Results tracked5621

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Category by category

Coding Claude Opus 4 leads

Claude Opus 4: 47.2 (#62), Kimi K2 Thinking Turbo: 38.4 (#178)

BenchmarkClaude Opus 4Kimi K2 Thinking Turbo
LMArena Coding14421454
SWE-bench Verified70.7%—
SWE-bench Verified (bash only)67.6%—
Aider Polyglot72%—
LMArena WebDev—1322
GSO6.9%—
WeirdML43.7%—
AlgoTune1.33—

Agentic & Tool Use Not comparable

Claude Opus 4: 34.8 (#42), Kimi K2 Thinking Turbo: —

BenchmarkClaude Opus 4Kimi K2 Thinking Turbo
Cybench38%—
DeepResearch Bench46.8%—
LMArena Search1127—
METR Time Horizons63.9%—

Reasoning Kimi K2 Thinking Turbo leads

Claude Opus 4: 27.3 (#121), Kimi K2 Thinking Turbo: 32.5 (#75)

BenchmarkClaude Opus 4Kimi K2 Thinking Turbo
LMArena Hard Prompts13991428
ARC-AGI-28.6%—
SimpleBench58.8%—
Kagi LLM Benchmark74.3%—
ARC-AGI-135.7%—
CritPt0.3%—
Chess Puzzles—20%
EnigmaEval5.6%—
DTBench81.6%—
LMCA37.4%—
Epoch Capabilities Index142.67—
ForecastBench61.1—

Math Kimi K2 Thinking Turbo leads

Claude Opus 4: 42.0 (#86), Kimi K2 Thinking Turbo: 47.4 (#68)

BenchmarkClaude Opus 4Kimi K2 Thinking Turbo
OTIS Mock AIME 2024-202564.4%83.1%
LMArena Math13901429
Omni-MATH61.6%—
MATH Level 585%—
FrontierMath (Feb 2025 set)4.5%—
FrontierMath Tier 4 (v1)4.2%—

Knowledge Kimi K2 Thinking Turbo leads

Claude Opus 4: 44.0 (#88), Kimi K2 Thinking Turbo: 50.9 (#69)

BenchmarkClaude Opus 4Kimi K2 Thinking Turbo
GPQA Diamond76.3%84.2%
LMArena Expert13861439
Humanity's Last Exam10.7%—
MMLU-Pro87.5%—
Confabulations15.9%—
Vectara Hallucination Rate12%—
GPQA (HELM)70.8%—

Multimodal Not comparable

Claude Opus 4: 31.5 (#106), Kimi K2 Thinking Turbo: —

BenchmarkClaude Opus 4Kimi K2 Thinking Turbo
LMArena Vision1192—
GeoBench49%—
VPCT38%—

Multilingual Kimi K2 Thinking Turbo leads

Claude Opus 4: 48.8 (#138), Kimi K2 Thinking Turbo: 51.4 (#109)

BenchmarkClaude Opus 4Kimi K2 Thinking Turbo
LMArena Non-English13621398
LMArena Chinese13861456
LMArena French13721425
LMArena German13911390
LMArena Japanese13311357
LMArena Korean13211330
LMArena Russian13921391
LMArena Spanish13891406

Instruction Following Claude Opus 4 leads

Claude Opus 4: 77.1 (#28), Kimi K2 Thinking Turbo: 74.0 (#109)

BenchmarkClaude Opus 4Kimi K2 Thinking Turbo
LMArena Instruction Following14061403
IFEval91.8%—

Long Context Kimi K2 Thinking Turbo leads

Claude Opus 4: 39.6 (#172), Kimi K2 Thinking Turbo: 43.2 (#102)

BenchmarkClaude Opus 4Kimi K2 Thinking Turbo
LMArena Longer Query14221415
Fiction.LiveBench61.1%—

Writing & Preference Claude Opus 4 leads

Claude Opus 4: 61.2 (#89), Kimi K2 Thinking Turbo: 60.0 (#104)

BenchmarkClaude Opus 4Kimi K2 Thinking Turbo
LMArena Text13771415
LMArena Creative Writing13871374
LMArena Multi-Turn13961414
Short-Story Creative Writing83.6%—
EQ-Bench Creative Writing1580—
WildBench85.2%—

Frequently asked questions

Is Claude Opus 4 better than Kimi K2 Thinking Turbo?

Kimi K2 Thinking Turbo is the stronger model overall, scoring 45.8 to 43.1 on the Noometry Index.

Is Claude Opus 4 or Kimi K2 Thinking Turbo better for coding?

Claude Opus 4 scores higher on coding benchmarks: 47.2 versus 38.4 in the Noometry coding category.

How many benchmarks do Claude Opus 4 and Kimi K2 Thinking Turbo share?

19 benchmarks have published results for both models. Claude Opus 4 has 56 scored results on Noometry and Kimi K2 Thinking Turbo has 21.

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