Noometry

Model comparison

Claude Sonnet 5 vs Qwen3.8 27B

Claude Sonnet 5 is the stronger model overall, scoring 54.5 to 45.3 on the Noometry Index. Qwen3.8 27B costs 3.6× less per token, which makes it the better buy when Claude Sonnet 5's lead doesn't matter for your workload.

Last verified . 28 shared benchmarks.

Claude Sonnet 5 Anthropic

54.5

Rank #26 Confirmed

Qwen3.8 27B Alibaba (Qwen)

45.3

Rank #64 Confirmed

Summary

  • They share 28 benchmarks with published results for both. Claude Sonnet 5 scores higher in 8 categories and Qwen3.8 27B in 1 category; 6 gaps are clear of the uncertainty.
  • The widest gap is in math, where Claude Sonnet 5 leads 66.1 to 35.7.
  • The biggest single-benchmark swing is ProofBench: 77% for Claude Sonnet 5 and 16% for Qwen3.8 27B.
  • Qwen3.8 27B is cheaper at $0.99 / $1.49 per million input/output tokens, against $2 / $10 for Claude Sonnet 5.
  • Claude Sonnet 5 accepts more context: 1M tokens versus 262K.
  • Qwen3.8 27B has downloadable open weights; the other is API-only.

Side by side

Claude Sonnet 5Qwen3.8 27B
ProviderAnthropicAlibaba (Qwen)
Noometry Index54.545.3
Released2026-06-292026-08-14
WeightsProprietaryOpen
Context window1M262K
Max output128K33K
Input $ / M tokens$2$0.99
Output $ / M tokens$10$1.49
Results tracked5128

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Category by category

Coding Claude Sonnet 5 leads

Claude Sonnet 5: 55.5 (#20), Qwen3.8 27B: 50.3 (#42)

BenchmarkClaude Sonnet 5Qwen3.8 27B
LMArena WebDev15401592
SciCode53.6%46.6%
LMArena Coding14831487
DeepSWE53.8%—
FrontierCode42.7%—
CursorBench34.1%—
GSO37.3%—
WeirdML68.8%—
ALE-Bench1,463—

Agentic & Tool Use Not comparable

Claude Sonnet 5: 42.7 (#16), Qwen3.8 27B: —

BenchmarkClaude Sonnet 5Qwen3.8 27B
APEX-Agents54.5%—
GBAEval65.3%—
LMArena Search1194—
Vending-Bench 26,378—

Reasoning Claude Sonnet 5 leads

Claude Sonnet 5: 48.2 (#37), Qwen3.8 27B: 31.5 (#71)

BenchmarkClaude Sonnet 5Qwen3.8 27B
NYT Connections (extended)75.1%54.5%
CritPt16.9%5.4%
LMArena Hard Prompts14611459
DTBench92.5%88%
LMCA50%41.4%
Surface Evolver Bench60%45%
Epoch Capabilities Index156.34149.38
SimpleBench60.6%—
Chess Puzzles35%—
Mystery Game Puzzles35%—
Bench to the Future 30.14—
ForecastBench61.1—

Math Claude Sonnet 5 leads

Claude Sonnet 5: 66.1 (#21), Qwen3.8 27B: 35.7 (#139)

BenchmarkClaude Sonnet 5Qwen3.8 27B
ProofBench77%16%
LMArena Math14671453
FrontierMath (Tiers 1-3)65.6%—
FrontierMath Tier 429.3%—
OTIS Mock AIME 2024-202594.7%—

Knowledge Claude Sonnet 5 leads

Claude Sonnet 5: 55.7 (#42), Qwen3.8 27B: 40.9 (#105)

BenchmarkClaude Sonnet 5Qwen3.8 27B
LMArena Expert14911482
GPQA Diamond90.5%—
SimpleQA Verified33.7%—

Multimodal Claude Sonnet 5 leads

Claude Sonnet 5: 42.4 (#26), Qwen3.8 27B: 40.5 (#36)

BenchmarkClaude Sonnet 5Qwen3.8 27B
LMArena Vision12751270
Blueprint-Bench 224.9%—
LMArena Document1466—

Multilingual Too close to call

Claude Sonnet 5: 54.0 (#55), Qwen3.8 27B: 54.0 (#54)

BenchmarkClaude Sonnet 5Qwen3.8 27B
LMArena Non-English14311431
LMArena Chinese14751504
LMArena French14571468
LMArena German14481435
LMArena Japanese14221392
LMArena Korean14111389
LMArena Russian14521421
LMArena Spanish14361444

Instruction Following Too close to call

Claude Sonnet 5: 76.6 (#39), Qwen3.8 27B: 75.8 (#54)

BenchmarkClaude Sonnet 5Qwen3.8 27B
LMArena Instruction Following14531436

Long Context Too close to call

Claude Sonnet 5: 44.8 (#53), Qwen3.8 27B: 44.3 (#66)

BenchmarkClaude Sonnet 5Qwen3.8 27B
LMArena Longer Query14641448

Writing & Preference Claude Sonnet 5 leads

Claude Sonnet 5: 69.4 (#24), Qwen3.8 27B: 65.9 (#41)

BenchmarkClaude Sonnet 5Qwen3.8 27B
LMArena Text14431441
LMArena Creative Writing14161382
EQ-Bench Creative Writing17941671
LMArena Multi-Turn14541443
EQ-Bench 41236—

Frequently asked questions

Is Claude Sonnet 5 better than Qwen3.8 27B?

Claude Sonnet 5 is the stronger model overall, scoring 54.5 to 45.3 on the Noometry Index. Qwen3.8 27B costs 3.6× 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 Qwen3.8 27B?

Qwen3.8 27B is cheaper. It lists at $0.99 per million input tokens and $1.49 per million output tokens; Claude Sonnet 5 lists at $2 and $10.

Is Claude Sonnet 5 or Qwen3.8 27B better for coding?

Claude Sonnet 5 scores higher on coding benchmarks: 55.5 versus 50.3 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 Qwen3.8 27B share?

28 benchmarks have published results for both models. Claude Sonnet 5 has 51 scored results on Noometry and Qwen3.8 27B has 28.

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