Noometry

Model comparison

Claude Opus 4.1 vs Qwen3.5 Plus

Qwen3.5 Plus is the stronger model overall, scoring 42.9 to 41.0 on the Noometry Index.

Last verified . 11 shared benchmarks.

Claude Opus 4.1 Anthropic

41.0

Rank #142 Confirmed

Qwen3.5 Plus Alibaba (Qwen)

42.9

Rank #106 Confirmed

Summary

  • They share 11 benchmarks with published results for both. Claude Opus 4.1 scores higher in 1 category and Qwen3.5 Plus in 3 categories; 3 gaps are clear of the uncertainty.
  • The widest gap is in math, where Qwen3.5 Plus leads 49.6 to 22.3.
  • The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 68.9% for Claude Opus 4.1 and 86.7% for Qwen3.5 Plus.
  • Qwen3.5 Plus is cheaper at $0.40 / $2.40 per million input/output tokens, against $15 / $75 for Claude Opus 4.1.
  • Qwen3.5 Plus accepts more context: 1M tokens versus 200K.

Side by side

Claude Opus 4.1Qwen3.5 Plus
ProviderAnthropicAlibaba (Qwen)
Noometry Index41.042.9
Released2025-08-052026-02-16
WeightsProprietaryProprietary
Context window200K1M
Max output32K66K
Input $ / M tokens$15$0.40
Output $ / M tokens$75$2.40
Results tracked4815

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Category by category

Coding Not comparable

Claude Opus 4.1: 44.4 (#73), Qwen3.5 Plus: —

BenchmarkClaude Opus 4.1Qwen3.5 Plus
ALE-Bench674.77621.92
SWE-bench Verified73.3%—
LMArena WebDev1390—
WeirdML45.9%—
LMArena Coding1479—
AlgoTune1.34—

Agentic & Tool Use Not comparable

Claude Opus 4.1: 35.0 (#41), Qwen3.5 Plus: —

BenchmarkClaude Opus 4.1Qwen3.5 Plus
Terminal-Bench38%—
GDPval43.6%—
Cybench42%—
DeepResearch Bench48.3%—
LMArena Search1148—
METR Time Horizons66.8%—
Vending-Bench 2—0.54

Reasoning Too close to call

Claude Opus 4.1: 32.2 (#76), Qwen3.5 Plus: 32.8 (#74)

BenchmarkClaude Opus 4.1Qwen3.5 Plus
Chess Puzzles7%22%
Mystery Game Puzzles21%17%
DTBench80%80.5%
LMCA37.1%36.4%
Epoch Capabilities Index144.12146.78
SimpleBench60%—
EnigmaEval7.2%—
EBR-Bench7.9%—
LMArena Hard Prompts1443—
ForecastBench62—

Math Qwen3.5 Plus leads

Claude Opus 4.1: 22.3 (#277), Qwen3.5 Plus: 49.6 (#61)

BenchmarkClaude Opus 4.1Qwen3.5 Plus
OTIS Mock AIME 2024-202568.9%86.7%
FrontierMath (Feb 2025 set)7.2%21%
FrontierMath Tier 4 (v1)4.2%2.1%
FrontierMath (Tiers 1-3)12.6%—
FrontierMath Tier 42.4%—
LMArena Math1431—

Knowledge Qwen3.5 Plus leads

Claude Opus 4.1: 42.0 (#101), Qwen3.5 Plus: 46.0 (#83)

BenchmarkClaude Opus 4.1Qwen3.5 Plus
GPQA Diamond77.3%84.8%
Vectara Hallucination Rate11.8%10.7%
Humanity's Last Exam11.5%—
SimpleQA Verified—25.4%
Confabulations17.1%—
LMArena Expert1439—

Multimodal Not comparable

Claude Opus 4.1: 26.8 (#119), Qwen3.5 Plus: —

BenchmarkClaude Opus 4.1Qwen3.5 Plus
VPCT35%—

Multilingual Not comparable

Claude Opus 4.1: 52.0 (#95), Qwen3.5 Plus: —

BenchmarkClaude Opus 4.1Qwen3.5 Plus
LMArena Non-English1405—
LMArena Chinese1427—
LMArena French1431—
LMArena German1413—
LMArena Japanese1378—
LMArena Korean1380—
LMArena Russian1422—
LMArena Spanish1448—

Instruction Following Not comparable

Claude Opus 4.1: 75.6 (#58), Qwen3.5 Plus: —

BenchmarkClaude Opus 4.1Qwen3.5 Plus
LMArena Instruction Following1435—

Long Context Claude Opus 4.1 leads

Claude Opus 4.1: 44.5 (#63), Qwen3.5 Plus: 43.0 (#113)

BenchmarkClaude Opus 4.1Qwen3.5 Plus
CL-bench—19.8%
CL-bench Life—12.4%
LMArena Longer Query1455—

Writing & Preference Not comparable

Claude Opus 4.1: 62.4 (#74), Qwen3.5 Plus: —

BenchmarkClaude Opus 4.1Qwen3.5 Plus
LMArena Text1419—
LMArena Creative Writing1412—
Short-Story Creative Writing84.7%—
LMArena Multi-Turn1444—

Frequently asked questions

Is Claude Opus 4.1 better than Qwen3.5 Plus?

Qwen3.5 Plus is the stronger model overall, scoring 42.9 to 41.0 on the Noometry Index.

Which is cheaper, Claude Opus 4.1 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 Opus 4.1 lists at $15 and $75.

Which has the bigger context window?

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

How many benchmarks do Claude Opus 4.1 and Qwen3.5 Plus share?

11 benchmarks have published results for both models. Claude Opus 4.1 has 48 scored results on Noometry and Qwen3.5 Plus has 15.

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