Noometry

Model comparison

Claude Sonnet 5 vs Kimi K2.5 Instant

Claude Sonnet 5 is the stronger model overall, scoring 54.6 to 43.6 on the Noometry Index.

Last verified . 18 shared benchmarks.

Claude Sonnet 5 Anthropic

54.6

Rank #29 Confirmed

Kimi K2.5 Instant Moonshot AI

43.6

Rank #89 Confirmed

Summary

  • They share 18 benchmarks with published results for both. Claude Sonnet 5 scores higher in 9 categories and Kimi K2.5 Instant in 0 categories; 8 gaps are clear of the uncertainty.
  • The widest gap is in math, where Claude Sonnet 5 leads 66.2 to 39.4.
  • Kimi K2.5 Instant has downloadable open weights; the other is API-only.

Side by side

Claude Sonnet 5Kimi K2.5 Instant
ProviderAnthropicMoonshot AI
Noometry Index54.643.6
Released2026-06-29—
WeightsProprietaryOpen
Context window1M—
Max output128K—
Input $ / M tokens$2—
Output $ / M tokens$10—
Results tracked5118

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Category by category

Coding Claude Sonnet 5 leads

Claude Sonnet 5: 55.5 (#26), Kimi K2.5 Instant: 42.6 (#97)

BenchmarkClaude Sonnet 5Kimi K2.5 Instant
LMArena WebDev15411404
LMArena Coding14831484
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 K2.5 Instant: —

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

Reasoning Claude Sonnet 5 leads

Claude Sonnet 5: 49.1 (#39), Kimi K2.5 Instant: 29.7 (#90)

BenchmarkClaude Sonnet 5Kimi K2.5 Instant
LMArena Hard Prompts14611443
SimpleBench60.6%—
NYT Connections (extended)75.1%—
CritPt16.9%—
Chess Puzzles35%—
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 K2.5 Instant: 39.4 (#105)

BenchmarkClaude Sonnet 5Kimi K2.5 Instant
LMArena Math14671442
FrontierMath (Tiers 1-3)65.6%—
FrontierMath Tier 429.3%—
OTIS Mock AIME 2024-202594.7%—
ProofBench77%—

Knowledge Claude Sonnet 5 leads

Claude Sonnet 5: 55.6 (#47), Kimi K2.5 Instant: 40.2 (#123)

BenchmarkClaude Sonnet 5Kimi K2.5 Instant
LMArena Expert14901440
GPQA Diamond90.5%—
SimpleQA Verified33.7%—

Multimodal Claude Sonnet 5 leads

Claude Sonnet 5: 42.4 (#31), Kimi K2.5 Instant: 40.2 (#50)

BenchmarkClaude Sonnet 5Kimi K2.5 Instant
LMArena Vision12741254
Blueprint-Bench 224.9%—
LMArena Document1466—

Multilingual Claude Sonnet 5 leads

Claude Sonnet 5: 53.8 (#55), Kimi K2.5 Instant: 52.0 (#94)

BenchmarkClaude Sonnet 5Kimi K2.5 Instant
LMArena Non-English14311406
LMArena Chinese14771449
LMArena French14601403
LMArena German14401413
LMArena Korean14111378
LMArena Russian14511404
LMArena Spanish14371447
LMArena Japanese1422—

Instruction Following Claude Sonnet 5 leads

Claude Sonnet 5: 76.3 (#41), Kimi K2.5 Instant: 75.3 (#65)

BenchmarkClaude Sonnet 5Kimi K2.5 Instant
LMArena Instruction Following14521430

Long Context Too close to call

Claude Sonnet 5: 44.8 (#55), Kimi K2.5 Instant: 43.9 (#83)

BenchmarkClaude Sonnet 5Kimi K2.5 Instant
LMArena Longer Query14631435

Writing & Preference Claude Sonnet 5 leads

Claude Sonnet 5: 69.2 (#25), Kimi K2.5 Instant: 60.6 (#95)

BenchmarkClaude Sonnet 5Kimi K2.5 Instant
LMArena Text14421420
LMArena Creative Writing14161381
LMArena Multi-Turn14541427
EQ-Bench Creative Writing1794—
EQ-Bench 41236—

Frequently asked questions

Is Claude Sonnet 5 better than Kimi K2.5 Instant?

Claude Sonnet 5 is the stronger model overall, scoring 54.6 to 43.6 on the Noometry Index.

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

Claude Sonnet 5 scores higher on coding benchmarks: 55.5 versus 42.6 in the Noometry coding category.

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

18 benchmarks have published results for both models. Claude Sonnet 5 has 51 scored results on Noometry and Kimi K2.5 Instant has 18.

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