Noometry

Model comparison

Claude Opus 5.5 vs Kimi K2.7 Code

Claude Opus 5.5 is the stronger model overall, scoring 68.6 to 43.3 on the Noometry Index. Kimi K2.7 Code costs 4.7× less per token, which makes it the better buy when Claude Opus 5.5's lead doesn't matter for your workload.

Last verified . 13 shared benchmarks.

Claude Opus 5.5 Anthropic

68.6

Rank #3 Confirmed

Kimi K2.7 Code Moonshot AI

43.3

Rank #94 Confirmed

Summary

  • They share 13 benchmarks with published results for both. Claude Opus 5.5 scores higher in 5 categories and Kimi K2.7 Code in 0 categories; 5 gaps are clear of the uncertainty.
  • The widest gap is in reasoning, where Claude Opus 5.5 leads 80.2 to 39.0.
  • The biggest single-benchmark swing is FrontierMath Tier 4: 95% for Claude Opus 5.5 and 12.2% for Kimi K2.7 Code.
  • Kimi K2.7 Code is cheaper at $0.95 / $4 per million input/output tokens, against $4 / $20 for Claude Opus 5.5.
  • Claude Opus 5.5 accepts more context: 1M tokens versus 262K.
  • Kimi K2.7 Code has downloadable open weights; the other is API-only.

Side by side

Claude Opus 5.5Kimi K2.7 Code
ProviderAnthropicMoonshot AI
Noometry Index68.643.3
Released2026-09-222026-06-12
WeightsProprietaryOpen
Context window1M262K
Max output128K262K
Input $ / M tokens$4$0.95
Output $ / M tokens$20$4
Results tracked4419

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Category by category

Coding Claude Opus 5.5 leads

Claude Opus 5.5: 71.9 (#3), Kimi K2.7 Code: 42.9 (#95)

BenchmarkClaude Opus 5.5Kimi K2.7 Code
FrontierCode54.6%30.1%
LMArena WebDev18131473
SciCode66.9%47.5%
ALE-Bench2,147886.23
DeepSWE—30.5%
CursorBench57.8%—
FrontierSWE62.3%—
WeirdML—54.1%
LMArena Coding1547—
MirrorCode77.4%—

Agentic & Tool Use Claude Opus 5.5 leads

Claude Opus 5.5: 45.3 (#15), Kimi K2.7 Code: 24.0 (#122)

BenchmarkClaude Opus 5.5Kimi K2.7 Code
APEX-Agents73.5%37.6%
Vending-Bench 29,2355,083
GBAEval—0.9%
GDP.pdf30.6%—

Reasoning Claude Opus 5.5 leads

Claude Opus 5.5: 80.2 (#3), Kimi K2.7 Code: 39.0 (#61)

BenchmarkClaude Opus 5.5Kimi K2.7 Code
CritPt31.7%10%
Epoch Capabilities Index167.33149.97
ARC-AGI-293.3%—
SimpleBench—57.9%
NYT Connections (extended)88.5%—
ARC-AGI-198.5%—
Chess Puzzles—21%
EBR-Bench71.4%—
LMArena Hard Prompts1535—
Mystery Game Puzzles71%—
DTBench98.9%—
LMCA68.2%—
Surface Evolver Bench—48.8%

Math Claude Opus 5.5 leads

Claude Opus 5.5: 91.8 (#3), Kimi K2.7 Code: 52.9 (#48)

BenchmarkClaude Opus 5.5Kimi K2.7 Code
FrontierMath (Tiers 1-3)91.2%54%
FrontierMath Tier 495%12.2%
OTIS Mock AIME 2024-2025100%95.6%
ProofBench100%—
LMArena Math1506—
FrontierMath Erdős2.9%—

Knowledge Claude Opus 5.5 leads

Claude Opus 5.5: 66.4 (#10), Kimi K2.7 Code: 53.5 (#57)

BenchmarkClaude Opus 5.5Kimi K2.7 Code
GPQA Diamond90.6%87.9%
SimpleQA Verified72.2%36.5%
LMArena Expert1547—

Multimodal Not comparable

Claude Opus 5.5: 57.8 (#1), Kimi K2.7 Code: —

BenchmarkClaude Opus 5.5Kimi K2.7 Code
LMArena Vision1321—
Blueprint-Bench 251.2%—
Furniture Assembly83.3%—

Multilingual Not comparable

Claude Opus 5.5: 59.1 (#2), Kimi K2.7 Code: —

BenchmarkClaude Opus 5.5Kimi K2.7 Code
LMArena Non-English1507—
LMArena Chinese1588—
LMArena French1514—
LMArena Russian1520—
LMArena Spanish1507—

Instruction Following Not comparable

Claude Opus 5.5: 80.0 (#3), Kimi K2.7 Code: —

BenchmarkClaude Opus 5.5Kimi K2.7 Code
LMArena Instruction Following1537—

Long Context Not comparable

Claude Opus 5.5: 47.1 (#19), Kimi K2.7 Code: —

BenchmarkClaude Opus 5.5Kimi K2.7 Code
LMArena Longer Query1532—

Writing & Preference Not comparable

Claude Opus 5.5: 78.2 (#3), Kimi K2.7 Code: —

BenchmarkClaude Opus 5.5Kimi K2.7 Code
LMArena Text1515—
LMArena Creative Writing1533—
EQ-Bench Creative Writing2050—
LMArena Multi-Turn1499—

Frequently asked questions

Is Claude Opus 5.5 better than Kimi K2.7 Code?

Claude Opus 5.5 is the stronger model overall, scoring 68.6 to 43.3 on the Noometry Index. Kimi K2.7 Code costs 4.7× less per token, which makes it the better buy when Claude Opus 5.5's lead doesn't matter for your workload.

Which is cheaper, Claude Opus 5.5 or Kimi K2.7 Code?

Kimi K2.7 Code is cheaper. It lists at $0.95 per million input tokens and $4 per million output tokens; Claude Opus 5.5 lists at $4 and $20.

Is Claude Opus 5.5 or Kimi K2.7 Code better for coding?

Claude Opus 5.5 scores higher on coding benchmarks: 71.9 versus 42.9 in the Noometry coding category.

Which has the bigger context window?

Claude Opus 5.5 does, with 1M tokens against 262K.

How many benchmarks do Claude Opus 5.5 and Kimi K2.7 Code share?

13 benchmarks have published results for both models. Claude Opus 5.5 has 44 scored results on Noometry and Kimi K2.7 Code has 19.

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