Model comparison

Claude Sonnet 5.5 vs Kimi K2.7 Code

Claude Sonnet 5.5 is the stronger model overall, scoring 61.9 to 43.3 on the Noometry Index. Kimi K2.7 Code costs 2.3× less per token, which makes it the better buy when Claude Sonnet 5.5's lead doesn't matter for your workload.

Last verified October 10, 2026. 12 shared benchmarks.

Claude Sonnet 5.5 Anthropic

61.9

Rank #10 Confirmed

Kimi K2.7 Code Moonshot AI

43.3

Rank #94 Confirmed

Summary

They share 12 benchmarks with published results for both. Claude Sonnet 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 math, where Claude Sonnet 5.5 leads 87.9 to 52.9.
The biggest single-benchmark swing is FrontierMath Tier 4: 80.5% for Claude Sonnet 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 $2 / $10 for Claude Sonnet 5.5.
Claude Sonnet 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 Sonnet 5.5 and Kimi K2.7 Code specifications
	Claude Sonnet 5.5	Kimi K2.7 Code
Provider	Anthropic	Moonshot AI
Noometry Index	61.9	43.3
Released	2026-09-28	2026-06-12
Weights	Proprietary	Open
Context window	1M	262K
Max output	128K	262K
Input $ / M tokens	$2	$0.95
Output $ / M tokens	$10	$4
Results tracked	32	19

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Category by category

Coding Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 67.3 (#6), Kimi K2.7 Code: 42.9 (#95)

Coding benchmarks
Benchmark	Claude Sonnet 5.5	Kimi K2.7 Code
FrontierCode	52.1%	30.1%
LMArena WebDev	1774	1473
SciCode	61%	47.5%
ALE-Bench	1,819	886.23
DeepSWE	—	30.5%
CursorBench	55.5%	—
FrontierSWE	61.9%	—
WeirdML	—	54.1%
LMArena Coding	1513	—

Agentic & Tool Use Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 45.0 (#16), Kimi K2.7 Code: 24.0 (#122)

Agentic & Tool Use benchmarks
Benchmark	Claude Sonnet 5.5	Kimi K2.7 Code
APEX-Agents	75.5%	37.6%
GBAEval	—	0.9%
Vending-Bench 2	—	5,083

Reasoning Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 54.0 (#28), Kimi K2.7 Code: 39.0 (#61)

Reasoning benchmarks
Benchmark	Claude Sonnet 5.5	Kimi K2.7 Code
CritPt	31.4%	10%
Epoch Capabilities Index	165.03	149.97
SimpleBench	—	57.9%
NYT Connections (extended)	80.5%	—
Chess Puzzles	—	21%
LMArena Hard Prompts	1495	—
Mystery Game Puzzles	65%	—
Surface Evolver Bench	—	48.8%

Math Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 87.9 (#6), Kimi K2.7 Code: 52.9 (#48)

Math benchmarks
Benchmark	Claude Sonnet 5.5	Kimi K2.7 Code
FrontierMath (Tiers 1-3)	88.8%	54%
FrontierMath Tier 4	80.5%	12.2%
OTIS Mock AIME 2024-2025	100%	95.6%
ProofBench	100%	—
LMArena Math	1510	—
FrontierMath Erdős	2.9%	—

Knowledge Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 66.0 (#12), Kimi K2.7 Code: 53.5 (#57)

Knowledge benchmarks
Benchmark	Claude Sonnet 5.5	Kimi K2.7 Code
GPQA Diamond	95.6%	87.9%
SimpleQA Verified	46.5%	36.5%
LMArena Expert	1540	—

Multimodal Not comparable

Claude Sonnet 5.5: 51.5 (#6), Kimi K2.7 Code: —

Multimodal benchmarks
Benchmark	Claude Sonnet 5.5	Kimi K2.7 Code
LMArena Vision	1289	—
Furniture Assembly	75%	—

Multilingual Not comparable

Claude Sonnet 5.5: 55.3 (#30), Kimi K2.7 Code: —

Multilingual benchmarks
Benchmark	Claude Sonnet 5.5	Kimi K2.7 Code
LMArena Non-English	1452	—
LMArena Chinese	1522	—
LMArena Russian	1451	—

Instruction Following Not comparable

Claude Sonnet 5.5: 78.3 (#11), Kimi K2.7 Code: —

Instruction Following benchmarks
Benchmark	Claude Sonnet 5.5	Kimi K2.7 Code
LMArena Instruction Following	1495	—

Long Context Not comparable

Claude Sonnet 5.5: 45.9 (#28), Kimi K2.7 Code: —

Long Context benchmarks
Benchmark	Claude Sonnet 5.5	Kimi K2.7 Code
LMArena Longer Query	1498	—

Writing & Preference Not comparable

Claude Sonnet 5.5: 66.0 (#40), Kimi K2.7 Code: —

Writing & Preference benchmarks
Benchmark	Claude Sonnet 5.5	Kimi K2.7 Code
LMArena Text	1471	—
LMArena Creative Writing	1465	—
LMArena Multi-Turn	1474	—

Frequently asked questions

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

Which is cheaper, Claude Sonnet 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 Sonnet 5.5 lists at $2 and $10.

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

Claude Sonnet 5.5 scores higher on coding benchmarks: 67.3 versus 42.9 in the Noometry coding category.

Which has the bigger context window?

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

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

12 benchmarks have published results for both models. Claude Sonnet 5.5 has 32 scored results on Noometry and Kimi K2.7 Code has 19.