Noometry

Model comparison

Claude Opus 5.5 vs Kimi K2 Thinking Turbo

Claude Opus 5.5 is the stronger model overall, scoring 68.6 to 45.8 on the Noometry Index.

Last verified . 17 shared benchmarks.

Claude Opus 5.5 Anthropic

68.6

Rank #3 Confirmed

Kimi K2 Thinking Turbo Moonshot AI

45.8

Rank #70 Confirmed

Summary

  • They share 17 benchmarks with published results for both. Claude Opus 5.5 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 reasoning, where Claude Opus 5.5 leads 80.2 to 32.5.
  • The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 100% for Claude Opus 5.5 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 5.5Kimi K2 Thinking Turbo
ProviderAnthropicMoonshot AI
Noometry Index68.645.8
Released2026-09-222025-11-06
WeightsProprietaryOpen
Context window1M—
Max output128K—
Input $ / M tokens$4—
Output $ / M tokens$20—
Results tracked4421

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Category by category

Coding Claude Opus 5.5 leads

Claude Opus 5.5: 71.9 (#3), Kimi K2 Thinking Turbo: 38.4 (#178)

BenchmarkClaude Opus 5.5Kimi K2 Thinking Turbo
LMArena WebDev18131322
LMArena Coding15471454
FrontierCode54.6%—
CursorBench57.8%—
FrontierSWE62.3%—
SciCode66.9%—
MirrorCode77.4%—
ALE-Bench2,147—

Agentic & Tool Use Not comparable

Claude Opus 5.5: 45.3 (#15), Kimi K2 Thinking Turbo: —

BenchmarkClaude Opus 5.5Kimi K2 Thinking Turbo
APEX-Agents73.5%—
GDP.pdf30.6%—
Vending-Bench 29,235—

Reasoning Claude Opus 5.5 leads

Claude Opus 5.5: 80.2 (#3), Kimi K2 Thinking Turbo: 32.5 (#75)

BenchmarkClaude Opus 5.5Kimi K2 Thinking Turbo
LMArena Hard Prompts15351428
ARC-AGI-293.3%—
NYT Connections (extended)88.5%—
ARC-AGI-198.5%—
CritPt31.7%—
Chess Puzzles—20%
EBR-Bench71.4%—
Mystery Game Puzzles71%—
DTBench98.9%—
LMCA68.2%—
Epoch Capabilities Index167.33—

Math Claude Opus 5.5 leads

Claude Opus 5.5: 91.8 (#3), Kimi K2 Thinking Turbo: 47.4 (#68)

BenchmarkClaude Opus 5.5Kimi K2 Thinking Turbo
OTIS Mock AIME 2024-2025100%83.1%
LMArena Math15061429
FrontierMath (Tiers 1-3)91.2%—
FrontierMath Tier 495%—
ProofBench100%—
FrontierMath Erdős2.9%—

Knowledge Claude Opus 5.5 leads

Claude Opus 5.5: 66.4 (#10), Kimi K2 Thinking Turbo: 50.9 (#69)

BenchmarkClaude Opus 5.5Kimi K2 Thinking Turbo
GPQA Diamond90.6%84.2%
LMArena Expert15471439
SimpleQA Verified72.2%—

Multimodal Not comparable

Claude Opus 5.5: 57.8 (#1), Kimi K2 Thinking Turbo: —

BenchmarkClaude Opus 5.5Kimi K2 Thinking Turbo
LMArena Vision1321—
Blueprint-Bench 251.2%—
Furniture Assembly83.3%—

Multilingual Claude Opus 5.5 leads

Claude Opus 5.5: 59.1 (#2), Kimi K2 Thinking Turbo: 51.4 (#109)

BenchmarkClaude Opus 5.5Kimi K2 Thinking Turbo
LMArena Non-English15071398
LMArena Chinese15881456
LMArena French15141425
LMArena Russian15201391
LMArena Spanish15071406
LMArena German—1390
LMArena Japanese—1357
LMArena Korean—1330

Instruction Following Claude Opus 5.5 leads

Claude Opus 5.5: 80.0 (#3), Kimi K2 Thinking Turbo: 74.0 (#109)

BenchmarkClaude Opus 5.5Kimi K2 Thinking Turbo
LMArena Instruction Following15371403

Long Context Claude Opus 5.5 leads

Claude Opus 5.5: 47.1 (#19), Kimi K2 Thinking Turbo: 43.2 (#102)

BenchmarkClaude Opus 5.5Kimi K2 Thinking Turbo
LMArena Longer Query15321415

Writing & Preference Claude Opus 5.5 leads

Claude Opus 5.5: 78.2 (#3), Kimi K2 Thinking Turbo: 60.0 (#104)

BenchmarkClaude Opus 5.5Kimi K2 Thinking Turbo
LMArena Text15151415
LMArena Creative Writing15331374
LMArena Multi-Turn14991414
EQ-Bench Creative Writing2050—

Frequently asked questions

Is Claude Opus 5.5 better than Kimi K2 Thinking Turbo?

Claude Opus 5.5 is the stronger model overall, scoring 68.6 to 45.8 on the Noometry Index.

Is Claude Opus 5.5 or Kimi K2 Thinking Turbo better for coding?

Claude Opus 5.5 scores higher on coding benchmarks: 71.9 versus 38.4 in the Noometry coding category.

How many benchmarks do Claude Opus 5.5 and Kimi K2 Thinking Turbo share?

17 benchmarks have published results for both models. Claude Opus 5.5 has 44 scored results on Noometry and Kimi K2 Thinking Turbo has 21.

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