Noometry

Model comparison

Claude Sonnet 5 vs Qwen3.5 27B

Claude Sonnet 5 is the stronger model overall, scoring 54.5 to 41.4 on the Noometry Index. Qwen3.5 27B costs 4.8× less per token, which makes it the better buy when Claude Sonnet 5's lead doesn't matter for your workload.

Last verified . 25 shared benchmarks.

Claude Sonnet 5 Anthropic

54.5

Rank #26 Confirmed

Qwen3.5 27B Alibaba (Qwen)

41.4

Rank #127 Confirmed

Summary

  • They share 25 benchmarks with published results for both. Claude Sonnet 5 scores higher in 9 categories and Qwen3.5 27B in 0 categories; 9 gaps are clear of the uncertainty.
  • The widest gap is in math, where Claude Sonnet 5 leads 66.1 to 36.8.
  • The biggest single-benchmark swing is WeirdML: 68.8% for Claude Sonnet 5 and 39.5% for Qwen3.5 27B.
  • Qwen3.5 27B is cheaper at $0.30 / $2.40 per million input/output tokens, against $2 / $10 for Claude Sonnet 5.
  • Claude Sonnet 5 accepts more context: 1M tokens versus 262K.
  • Qwen3.5 27B has downloadable open weights; the other is API-only.

Side by side

Claude Sonnet 5Qwen3.5 27B
ProviderAnthropicAlibaba (Qwen)
Noometry Index54.541.4
Released2026-06-292026-02-23
WeightsProprietaryOpen
Context window1M262K
Max output128K66K
Input $ / M tokens$2$0.30
Output $ / M tokens$10$2.40
Results tracked5128

Sponsored placements are available on pages like this one. Advertise on Noometry

Category by category

Coding Claude Sonnet 5 leads

Claude Sonnet 5: 55.5 (#20), Qwen3.5 27B: 38.6 (#159)

BenchmarkClaude Sonnet 5Qwen3.5 27B
LMArena WebDev15401357
WeirdML68.8%39.5%
LMArena Coding14831427
ALE-Bench1,463349.45
DeepSWE53.8%—
FrontierCode42.7%—
CursorBench34.1%—
SciCode53.6%—
GSO37.3%—

Agentic & Tool Use Not comparable

Claude Sonnet 5: 42.7 (#16), Qwen3.5 27B: —

BenchmarkClaude Sonnet 5Qwen3.5 27B
Vending-Bench 26,378201.98
APEX-Agents54.5%—
GBAEval65.3%—
LMArena Search1194—

Reasoning Claude Sonnet 5 leads

Claude Sonnet 5: 48.2 (#37), Qwen3.5 27B: 26.6 (#116)

BenchmarkClaude Sonnet 5Qwen3.5 27B
NYT Connections (extended)75.1%47.9%
LMArena Hard Prompts14611414
DTBench92.5%82.4%
LMCA50%34%
SimpleBench60.6%—
CritPt16.9%—
Chess Puzzles35%—
Thematic Generalization—45.5%
Mystery Game Puzzles35%—
Surface Evolver Bench60%—
Bench to the Future 30.14—
Epoch Capabilities Index156.34—
ForecastBench61.1—

Math Claude Sonnet 5 leads

Claude Sonnet 5: 66.1 (#21), Qwen3.5 27B: 36.8 (#103)

BenchmarkClaude Sonnet 5Qwen3.5 27B
LMArena Math14671428
FrontierMath (Tiers 1-3)65.6%—
FrontierMath Tier 429.3%—
MathArena Final-Answer Competitions—56.7%
OTIS Mock AIME 2024-202594.7%—
ProofBench77%—

Knowledge Claude Sonnet 5 leads

Claude Sonnet 5: 55.7 (#42), Qwen3.5 27B: 37.4 (#149)

BenchmarkClaude Sonnet 5Qwen3.5 27B
LMArena Expert14911428
GPQA Diamond90.5%—
SimpleQA Verified33.7%—
Vectara Hallucination Rate—12.1%

Multimodal Claude Sonnet 5 leads

Claude Sonnet 5: 42.4 (#26), Qwen3.5 27B: 38.7 (#56)

BenchmarkClaude Sonnet 5Qwen3.5 27B
LMArena Vision12751240
Blueprint-Bench 224.9%—
LMArena Document1466—

Multilingual Claude Sonnet 5 leads

Claude Sonnet 5: 54.0 (#55), Qwen3.5 27B: 51.0 (#112)

BenchmarkClaude Sonnet 5Qwen3.5 27B
LMArena Non-English14311390
LMArena Chinese14751478
LMArena French14571409
LMArena German14481393
LMArena Japanese14221345
LMArena Korean14111359
LMArena Russian14521389
LMArena Spanish14361408

Instruction Following Claude Sonnet 5 leads

Claude Sonnet 5: 76.6 (#39), Qwen3.5 27B: 73.7 (#114)

BenchmarkClaude Sonnet 5Qwen3.5 27B
LMArena Instruction Following14531393

Long Context Claude Sonnet 5 leads

Claude Sonnet 5: 44.8 (#53), Qwen3.5 27B: 43.1 (#103)

BenchmarkClaude Sonnet 5Qwen3.5 27B
LMArena Longer Query14641413

Writing & Preference Claude Sonnet 5 leads

Claude Sonnet 5: 69.4 (#24), Qwen3.5 27B: 59.5 (#106)

BenchmarkClaude Sonnet 5Qwen3.5 27B
LMArena Text14431409
LMArena Creative Writing14161362
LMArena Multi-Turn14541410
EQ-Bench Creative Writing1794—
EQ-Bench 41236—

Frequently asked questions

Is Claude Sonnet 5 better than Qwen3.5 27B?

Claude Sonnet 5 is the stronger model overall, scoring 54.5 to 41.4 on the Noometry Index. Qwen3.5 27B costs 4.8× less per token, which makes it the better buy when Claude Sonnet 5's lead doesn't matter for your workload.

Which is cheaper, Claude Sonnet 5 or Qwen3.5 27B?

Qwen3.5 27B is cheaper. It lists at $0.30 per million input tokens and $2.40 per million output tokens; Claude Sonnet 5 lists at $2 and $10.

Is Claude Sonnet 5 or Qwen3.5 27B better for coding?

Claude Sonnet 5 scores higher on coding benchmarks: 55.5 versus 38.6 in the Noometry coding category.

Which has the bigger context window?

Claude Sonnet 5 does, with 1M tokens against 262K.

How many benchmarks do Claude Sonnet 5 and Qwen3.5 27B share?

25 benchmarks have published results for both models. Claude Sonnet 5 has 51 scored results on Noometry and Qwen3.5 27B has 28.

Related comparisons

Go deeper