Noometry

Model comparison

Claude Sonnet 5 vs Qwen3.5 Plus

Claude Sonnet 5 is the stronger model overall, scoring 54.6 to 42.9 on the Noometry Index. Qwen3.5 Plus costs 4.4× less per token, which makes it the better buy when Claude Sonnet 5's lead doesn't matter for your workload.

Last verified . 10 shared benchmarks.

Claude Sonnet 5 Anthropic

54.6

Rank #29 Confirmed

Qwen3.5 Plus Alibaba (Qwen)

42.9

Rank #106 Confirmed

Summary

  • They share 10 benchmarks with published results for both. Claude Sonnet 5 scores higher in 4 categories and Qwen3.5 Plus in 0 categories; 4 gaps are clear of the uncertainty.
  • The widest gap is in math, where Claude Sonnet 5 leads 66.2 to 49.6.
  • The biggest single-benchmark swing is Mystery Game Puzzles: 35% for Claude Sonnet 5 and 17% for Qwen3.5 Plus.
  • Qwen3.5 Plus is cheaper at $0.40 / $2.40 per million input/output tokens, against $2 / $10 for Claude Sonnet 5.

Side by side

Claude Sonnet 5Qwen3.5 Plus
ProviderAnthropicAlibaba (Qwen)
Noometry Index54.642.9
Released2026-06-292026-02-16
WeightsProprietaryProprietary
Context window1M1M
Max output128K66K
Input $ / M tokens$2$0.40
Output $ / M tokens$10$2.40
Results tracked5115

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Category by category

Coding Not comparable

Claude Sonnet 5: 55.5 (#26), Qwen3.5 Plus: —

BenchmarkClaude Sonnet 5Qwen3.5 Plus
ALE-Bench1,463621.92
DeepSWE53.8%—
FrontierCode42.7%—
CursorBench34.1%—
LMArena WebDev1541—
SciCode54.3%—
GSO37.3%—
WeirdML68.8%—
LMArena Coding1483—

Agentic & Tool Use Not comparable

Claude Sonnet 5: 42.8 (#18), Qwen3.5 Plus: —

BenchmarkClaude Sonnet 5Qwen3.5 Plus
Vending-Bench 26,3780.54
APEX-Agents54.5%—
GBAEval65.3%—
LMArena Search1194—

Reasoning Claude Sonnet 5 leads

Claude Sonnet 5: 49.1 (#39), Qwen3.5 Plus: 32.8 (#74)

BenchmarkClaude Sonnet 5Qwen3.5 Plus
Chess Puzzles35%22%
Mystery Game Puzzles35%17%
DTBench92.5%80.5%
LMCA50%36.4%
Epoch Capabilities Index156.21146.78
SimpleBench60.6%—
NYT Connections (extended)75.1%—
CritPt16.9%—
LMArena Hard Prompts1461—
Surface Evolver Bench60%—
Bench to the Future 30.14—
ForecastBench61.1—

Math Claude Sonnet 5 leads

Claude Sonnet 5: 66.2 (#27), Qwen3.5 Plus: 49.6 (#61)

BenchmarkClaude Sonnet 5Qwen3.5 Plus
OTIS Mock AIME 2024-202594.7%86.7%
FrontierMath (Tiers 1-3)65.6%—
FrontierMath Tier 429.3%—
ProofBench77%—
LMArena Math1467—
FrontierMath (Feb 2025 set)—21%
FrontierMath Tier 4 (v1)—2.1%

Knowledge Claude Sonnet 5 leads

Claude Sonnet 5: 55.6 (#47), Qwen3.5 Plus: 46.0 (#83)

BenchmarkClaude Sonnet 5Qwen3.5 Plus
GPQA Diamond90.5%84.8%
SimpleQA Verified33.7%25.4%
Vectara Hallucination Rate—10.7%
LMArena Expert1490—

Multimodal Not comparable

Claude Sonnet 5: 42.4 (#31), Qwen3.5 Plus: —

BenchmarkClaude Sonnet 5Qwen3.5 Plus
LMArena Vision1274—
Blueprint-Bench 224.9%—
LMArena Document1466—

Multilingual Not comparable

Claude Sonnet 5: 53.8 (#55), Qwen3.5 Plus: —

BenchmarkClaude Sonnet 5Qwen3.5 Plus
LMArena Non-English1431—
LMArena Chinese1477—
LMArena French1460—
LMArena German1440—
LMArena Japanese1422—
LMArena Korean1411—
LMArena Russian1451—
LMArena Spanish1437—

Instruction Following Not comparable

Claude Sonnet 5: 76.3 (#41), Qwen3.5 Plus: —

BenchmarkClaude Sonnet 5Qwen3.5 Plus
LMArena Instruction Following1452—

Long Context Claude Sonnet 5 leads

Claude Sonnet 5: 44.8 (#55), Qwen3.5 Plus: 43.0 (#113)

BenchmarkClaude Sonnet 5Qwen3.5 Plus
CL-bench—19.8%
CL-bench Life—12.4%
LMArena Longer Query1463—

Writing & Preference Not comparable

Claude Sonnet 5: 69.2 (#25), Qwen3.5 Plus: —

BenchmarkClaude Sonnet 5Qwen3.5 Plus
LMArena Text1442—
LMArena Creative Writing1416—
EQ-Bench Creative Writing1794—
EQ-Bench 41236—
LMArena Multi-Turn1454—

Frequently asked questions

Is Claude Sonnet 5 better than Qwen3.5 Plus?

Claude Sonnet 5 is the stronger model overall, scoring 54.6 to 42.9 on the Noometry Index. Qwen3.5 Plus costs 4.4× 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 Plus?

Qwen3.5 Plus is cheaper. It lists at $0.40 per million input tokens and $2.40 per million output tokens; Claude Sonnet 5 lists at $2 and $10.

Which has the bigger context window?

Both accept 1M tokens.

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

10 benchmarks have published results for both models. Claude Sonnet 5 has 51 scored results on Noometry and Qwen3.5 Plus has 15.

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