Noometry

Model comparison

Claude Sonnet 5 vs Kimi K2 Thinking Turbo

Claude Sonnet 5 is the stronger model overall, scoring 54.6 to 45.8 on the Noometry Index.

Last verified . 21 shared benchmarks.

Claude Sonnet 5 Anthropic

54.6

Rank #29 Confirmed

Kimi K2 Thinking Turbo Moonshot AI

45.8

Rank #70 Confirmed

Summary

  • They share 21 benchmarks with published results for both. Claude Sonnet 5 scores higher in 8 categories and Kimi K2 Thinking Turbo in 0 categories; 8 gaps are clear of the uncertainty.
  • The widest gap is in math, where Claude Sonnet 5 leads 66.2 to 47.4.
  • The biggest single-benchmark swing is Chess Puzzles: 35% for Claude Sonnet 5 and 20% for Kimi K2 Thinking Turbo.
  • Kimi K2 Thinking Turbo has downloadable open weights; the other is API-only.

Side by side

Claude Sonnet 5Kimi K2 Thinking Turbo
ProviderAnthropicMoonshot AI
Noometry Index54.645.8
Released2026-06-292025-11-06
WeightsProprietaryOpen
Context window1M—
Max output128K—
Input $ / M tokens$2—
Output $ / M tokens$10—
Results tracked5121

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Category by category

Coding Claude Sonnet 5 leads

Claude Sonnet 5: 55.5 (#26), Kimi K2 Thinking Turbo: 38.4 (#178)

BenchmarkClaude Sonnet 5Kimi K2 Thinking Turbo
LMArena WebDev15411322
LMArena Coding14831454
DeepSWE53.8%—
FrontierCode42.7%—
CursorBench34.1%—
SciCode54.3%—
GSO37.3%—
WeirdML68.8%—
ALE-Bench1,463—

Agentic & Tool Use Not comparable

Claude Sonnet 5: 42.8 (#18), Kimi K2 Thinking Turbo: —

BenchmarkClaude Sonnet 5Kimi K2 Thinking Turbo
APEX-Agents54.5%—
GBAEval65.3%—
LMArena Search1194—
Vending-Bench 26,378—

Reasoning Claude Sonnet 5 leads

Claude Sonnet 5: 49.1 (#39), Kimi K2 Thinking Turbo: 32.5 (#75)

BenchmarkClaude Sonnet 5Kimi K2 Thinking Turbo
Chess Puzzles35%20%
LMArena Hard Prompts14611428
SimpleBench60.6%—
NYT Connections (extended)75.1%—
CritPt16.9%—
Mystery Game Puzzles35%—
DTBench92.5%—
LMCA50%—
Surface Evolver Bench60%—
Bench to the Future 30.14—
Epoch Capabilities Index156.21—
ForecastBench61.1—

Math Claude Sonnet 5 leads

Claude Sonnet 5: 66.2 (#27), Kimi K2 Thinking Turbo: 47.4 (#68)

BenchmarkClaude Sonnet 5Kimi K2 Thinking Turbo
OTIS Mock AIME 2024-202594.7%83.1%
LMArena Math14671429
FrontierMath (Tiers 1-3)65.6%—
FrontierMath Tier 429.3%—
ProofBench77%—

Knowledge Claude Sonnet 5 leads

Claude Sonnet 5: 55.6 (#47), Kimi K2 Thinking Turbo: 50.9 (#69)

BenchmarkClaude Sonnet 5Kimi K2 Thinking Turbo
GPQA Diamond90.5%84.2%
LMArena Expert14901439
SimpleQA Verified33.7%—

Multimodal Not comparable

Claude Sonnet 5: 42.4 (#31), Kimi K2 Thinking Turbo: —

BenchmarkClaude Sonnet 5Kimi K2 Thinking Turbo
LMArena Vision1274—
Blueprint-Bench 224.9%—
LMArena Document1466—

Multilingual Claude Sonnet 5 leads

Claude Sonnet 5: 53.8 (#55), Kimi K2 Thinking Turbo: 51.4 (#109)

BenchmarkClaude Sonnet 5Kimi K2 Thinking Turbo
LMArena Non-English14311398
LMArena Chinese14771456
LMArena French14601425
LMArena German14401390
LMArena Japanese14221357
LMArena Korean14111330
LMArena Russian14511391
LMArena Spanish14371406

Instruction Following Claude Sonnet 5 leads

Claude Sonnet 5: 76.3 (#41), Kimi K2 Thinking Turbo: 74.0 (#109)

BenchmarkClaude Sonnet 5Kimi K2 Thinking Turbo
LMArena Instruction Following14521403

Long Context Claude Sonnet 5 leads

Claude Sonnet 5: 44.8 (#55), Kimi K2 Thinking Turbo: 43.2 (#102)

BenchmarkClaude Sonnet 5Kimi K2 Thinking Turbo
LMArena Longer Query14631415

Writing & Preference Claude Sonnet 5 leads

Claude Sonnet 5: 69.2 (#25), Kimi K2 Thinking Turbo: 60.0 (#104)

BenchmarkClaude Sonnet 5Kimi K2 Thinking Turbo
LMArena Text14421415
LMArena Creative Writing14161374
LMArena Multi-Turn14541414
EQ-Bench Creative Writing1794—
EQ-Bench 41236—

Frequently asked questions

Is Claude Sonnet 5 better than Kimi K2 Thinking Turbo?

Claude Sonnet 5 is the stronger model overall, scoring 54.6 to 45.8 on the Noometry Index.

Is Claude Sonnet 5 or Kimi K2 Thinking Turbo better for coding?

Claude Sonnet 5 scores higher on coding benchmarks: 55.5 versus 38.4 in the Noometry coding category.

How many benchmarks do Claude Sonnet 5 and Kimi K2 Thinking Turbo share?

21 benchmarks have published results for both models. Claude Sonnet 5 has 51 scored results on Noometry and Kimi K2 Thinking Turbo has 21.

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