Noometry

Model comparison

Claude Sonnet 5.5 vs Qwen3.8 27B

Claude Sonnet 5.5 is the stronger model overall, scoring 61.9 to 46.0 on the Noometry Index. Qwen3.8 27B costs 6.6× less per token, which makes it the better buy when Claude Sonnet 5.5's lead doesn't matter for your workload.

Last verified . 20 shared benchmarks.

Claude Sonnet 5.5 Anthropic

61.9

Rank #10 Confirmed

Qwen3.8 27B Alibaba (Qwen)

46.0

Rank #68 Confirmed

Summary

  • They share 20 benchmarks with published results for both. Claude Sonnet 5.5 scores higher in 10 categories and Qwen3.8 27B in 0 categories; 9 gaps are clear of the uncertainty.
  • The widest gap is in math, where Claude Sonnet 5.5 leads 87.9 to 37.1.
  • The biggest single-benchmark swing is ProofBench: 100% for Claude Sonnet 5.5 and 16% for Qwen3.8 27B.
  • Qwen3.8 27B is cheaper at $0.04 / $2.30 per million input/output tokens, against $2 / $10 for Claude Sonnet 5.5.
  • Claude Sonnet 5.5 accepts more context: 1M tokens versus 262K.
  • Qwen3.8 27B has downloadable open weights; the other is API-only.

Side by side

Claude Sonnet 5.5Qwen3.8 27B
ProviderAnthropicAlibaba (Qwen)
Noometry Index61.946.0
Released2026-09-282026-08-14
WeightsProprietaryOpen
Context window1M262K
Max output128K33K
Input $ / M tokens$2$0.04
Output $ / M tokens$10$2.30
Results tracked3231

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Category by category

Coding Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 67.3 (#6), Qwen3.8 27B: 50.5 (#44)

BenchmarkClaude Sonnet 5.5Qwen3.8 27B
LMArena WebDev17741593
SciCode61%46.6%
LMArena Coding15131482
FrontierCode52.1%—
CursorBench55.5%—
FrontierSWE61.9%—
ALE-Bench1,819—

Agentic & Tool Use Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 45.0 (#16), Qwen3.8 27B: 32.9 (#57)

BenchmarkClaude Sonnet 5.5Qwen3.8 27B
APEX-Agents75.5%47.5%

Reasoning Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 54.0 (#28), Qwen3.8 27B: 41.0 (#54)

BenchmarkClaude Sonnet 5.5Qwen3.8 27B
NYT Connections (extended)80.5%54.5%
CritPt31.4%5.4%
LMArena Hard Prompts14951460
Epoch Capabilities Index165.03149.38
ARC-AGI-2—42.4%
ARC-AGI-1—87.5%
Mystery Game Puzzles65%—
DTBench—88%
LMCA—41.4%
Surface Evolver Bench—45%

Math Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 87.9 (#6), Qwen3.8 27B: 37.1 (#161)

BenchmarkClaude Sonnet 5.5Qwen3.8 27B
ProofBench100%16%
LMArena Math15101456
FrontierMath (Tiers 1-3)88.8%—
FrontierMath Tier 480.5%—
OTIS Mock AIME 2024-2025100%—
FrontierMath Erdős2.9%—

Knowledge Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 66.0 (#12), Qwen3.8 27B: 41.6 (#109)

BenchmarkClaude Sonnet 5.5Qwen3.8 27B
LMArena Expert15401482
GPQA Diamond95.6%—
SimpleQA Verified46.5%—

Multimodal Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 51.5 (#6), Qwen3.8 27B: 41.3 (#37)

BenchmarkClaude Sonnet 5.5Qwen3.8 27B
LMArena Vision12891271
Furniture Assembly75%—

Multilingual Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 55.3 (#30), Qwen3.8 27B: 53.7 (#60)

BenchmarkClaude Sonnet 5.5Qwen3.8 27B
LMArena Non-English14521430
LMArena Chinese15221504
LMArena Russian14511415
LMArena French—1465
LMArena German—1438
LMArena Japanese—1384
LMArena Korean—1393
LMArena Spanish—1448

Instruction Following Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 78.3 (#11), Qwen3.8 27B: 75.8 (#53)

BenchmarkClaude Sonnet 5.5Qwen3.8 27B
LMArena Instruction Following14951439

Long Context Claude Sonnet 5.5 leads

Claude Sonnet 5.5: 45.9 (#28), Qwen3.8 27B: 44.3 (#70)

BenchmarkClaude Sonnet 5.5Qwen3.8 27B
LMArena Longer Query14981450

Writing & Preference Too close to call

Claude Sonnet 5.5: 66.0 (#40), Qwen3.8 27B: 65.8 (#43)

BenchmarkClaude Sonnet 5.5Qwen3.8 27B
LMArena Text14711441
LMArena Creative Writing14651384
LMArena Multi-Turn14741441
EQ-Bench Creative Writing—1671

Frequently asked questions

Is Claude Sonnet 5.5 better than Qwen3.8 27B?

Claude Sonnet 5.5 is the stronger model overall, scoring 61.9 to 46.0 on the Noometry Index. Qwen3.8 27B costs 6.6× less per token, which makes it the better buy when Claude Sonnet 5.5's lead doesn't matter for your workload.

Which is cheaper, Claude Sonnet 5.5 or Qwen3.8 27B?

Qwen3.8 27B is cheaper. It lists at $0.04 per million input tokens and $2.30 per million output tokens; Claude Sonnet 5.5 lists at $2 and $10.

Is Claude Sonnet 5.5 or Qwen3.8 27B better for coding?

Claude Sonnet 5.5 scores higher on coding benchmarks: 67.3 versus 50.5 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 Qwen3.8 27B share?

20 benchmarks have published results for both models. Claude Sonnet 5.5 has 32 scored results on Noometry and Qwen3.8 27B has 31.

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