Noometry

Model comparison

Claude Sonnet 4 vs Qwen3.5 Plus

Qwen3.5 Plus is the stronger model overall, scoring 42.9 to 40.8 on the Noometry Index.

Last verified . 9 shared benchmarks.

Claude Sonnet 4 Anthropic

40.8

Rank #145 Confirmed

Qwen3.5 Plus Alibaba (Qwen)

42.9

Rank #106 Confirmed

Summary

  • They share 9 benchmarks with published results for both. Claude Sonnet 4 scores higher in 0 categories and Qwen3.5 Plus in 4 categories; 4 gaps are clear of the uncertainty.
  • The widest gap is in reasoning, where Qwen3.5 Plus leads 32.8 to 22.9.
  • The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 71.1% for Claude Sonnet 4 and 86.7% for Qwen3.5 Plus.
  • Qwen3.5 Plus is cheaper at $0.40 / $2.40 per million input/output tokens, against $3 / $15 for Claude Sonnet 4.
  • Qwen3.5 Plus accepts more context: 1M tokens versus 200K.

Side by side

Claude Sonnet 4Qwen3.5 Plus
ProviderAnthropicAlibaba (Qwen)
Noometry Index40.842.9
Released2025-05-222026-02-16
WeightsProprietaryProprietary
Context window200K1M
Max output64K66K
Input $ / M tokens$3$0.40
Output $ / M tokens$15$2.40
Results tracked5815

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Category by category

Coding Not comparable

Claude Sonnet 4: 43.5 (#88), Qwen3.5 Plus: —

BenchmarkClaude Sonnet 4Qwen3.5 Plus
ALE-Bench655.35621.92
SWE-bench Verified (bash only)64.9%—
Aider Polyglot61.3%—
SciCode40%—
GSO4.9%—
WeirdML46.1%—
LMArena Coding1414—

Agentic & Tool Use Not comparable

Claude Sonnet 4: 38.5 (#31), Qwen3.5 Plus: —

BenchmarkClaude Sonnet 4Qwen3.5 Plus
TheAgentCompany33.1%—
Cybench35%—
DeepResearch Bench46.6%—
OSWorld43.9%—
METR Time Horizons62%—
Vending-Bench 2—0.54

Reasoning Qwen3.5 Plus leads

Claude Sonnet 4: 22.9 (#187), Qwen3.5 Plus: 32.8 (#74)

BenchmarkClaude Sonnet 4Qwen3.5 Plus
DTBench77.1%80.5%
LMCA29%36.4%
Epoch Capabilities Index141.69146.78
ARC-AGI-25.9%—
SimpleBench45.5%—
Kagi LLM Benchmark73%—
ARC-AGI-140%—
CritPt0.3%—
Chess Puzzles—22%
EnigmaEval3.1%—
LMArena Hard Prompts1372—
Mystery Game Puzzles—17%
ForecastBench60.2—

Math Qwen3.5 Plus leads

Claude Sonnet 4: 43.3 (#80), Qwen3.5 Plus: 49.6 (#61)

BenchmarkClaude Sonnet 4Qwen3.5 Plus
OTIS Mock AIME 2024-202571.1%86.7%
FrontierMath (Feb 2025 set)4.1%21%
FrontierMath Tier 4 (v1)0%2.1%
Omni-MATH60.2%—
LMArena Math1375—
MATH Level 584.4%—

Knowledge Qwen3.5 Plus leads

Claude Sonnet 4: 41.8 (#108), Qwen3.5 Plus: 46.0 (#83)

BenchmarkClaude Sonnet 4Qwen3.5 Plus
GPQA Diamond79.2%84.8%
Vectara Hallucination Rate10.3%10.7%
Humanity's Last Exam7.8%—
SimpleQA Verified—25.4%
MMLU-Pro84.3%—
Confabulations13.2%—
GPQA (HELM)70.6%—
LMArena Expert1372—

Multimodal Not comparable

Claude Sonnet 4: 26.2 (#121), Qwen3.5 Plus: —

BenchmarkClaude Sonnet 4Qwen3.5 Plus
LMArena Vision1191—
GeoBench37%—
VPCT34%—
MindCube44.8%—

Multilingual Not comparable

Claude Sonnet 4: 46.7 (#156), Qwen3.5 Plus: —

BenchmarkClaude Sonnet 4Qwen3.5 Plus
LMArena Non-English1333—
LMArena Chinese1350—
LMArena French1363—
LMArena German1331—
LMArena Japanese1302—
LMArena Korean1291—
LMArena Russian1355—
LMArena Spanish1357—

Instruction Following Not comparable

Claude Sonnet 4: 71.7 (#145), Qwen3.5 Plus: —

BenchmarkClaude Sonnet 4Qwen3.5 Plus
IFEval84%—
LMArena Instruction Following1376—

Long Context Qwen3.5 Plus leads

Claude Sonnet 4: 33.7 (#259), Qwen3.5 Plus: 43.0 (#113)

BenchmarkClaude Sonnet 4Qwen3.5 Plus
Fiction.LiveBench46.9%—
CL-bench—19.8%
CL-bench Life—12.4%
LMArena Longer Query1398—

Writing & Preference Not comparable

Claude Sonnet 4: 57.1 (#132), Qwen3.5 Plus: —

BenchmarkClaude Sonnet 4Qwen3.5 Plus
LMArena Text1351—
LMArena Creative Writing1345—
Short-Story Creative Writing81.4%—
EQ-Bench Creative Writing1483—
WildBench83.8%—
LMArena Multi-Turn1376—

Frequently asked questions

Is Claude Sonnet 4 better than Qwen3.5 Plus?

Qwen3.5 Plus is the stronger model overall, scoring 42.9 to 40.8 on the Noometry Index.

Which is cheaper, Claude Sonnet 4 or Qwen3.5 Plus?

Qwen3.5 Plus is cheaper. It lists at $0.40 per million input tokens and $2.40 per million output tokens; Claude Sonnet 4 lists at $3 and $15.

Which has the bigger context window?

Qwen3.5 Plus does, with 1M tokens against 200K.

How many benchmarks do Claude Sonnet 4 and Qwen3.5 Plus share?

9 benchmarks have published results for both models. Claude Sonnet 4 has 58 scored results on Noometry and Qwen3.5 Plus has 15.

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