# 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.

- Canonical page: https://noometry.com/compare/claude-opus-4-1-vs-qwen3-5-plus
- Last updated: 2026-10-12
- Shared benchmarks: 11

## 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.

## Snapshot

| | Claude Opus 4.1 | Qwen3.5 Plus |
|---|---|---|
| Provider | Anthropic | Alibaba (Qwen) |
| Noometry Index | 41.0 | 42.9 |
| Rank | 142 | 106 |
| Context | 200K | 1M |
| Input $/M | $15 | $0.40 |
| Output $/M | $75 | $2.40 |
| Weights | Proprietary | Proprietary |

## Coding

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

| Benchmark | Claude Opus 4.1 | Qwen3.5 Plus |
|---|---|---|
| ALE-Bench | 674.77 | 621.92 |
| SWE-bench Verified | 73.3% | — |
| LMArena WebDev | 1390 | — |
| WeirdML | 45.9% | — |
| LMArena Coding | 1479 | — |
| AlgoTune | 1.34 | — |

## Agentic & Tool Use

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

| Benchmark | Claude Opus 4.1 | Qwen3.5 Plus |
|---|---|---|
| Terminal-Bench | 38% | — |
| GDPval | 43.6% | — |
| Cybench | 42% | — |
| DeepResearch Bench | 48.3% | — |
| LMArena Search | 1148 | — |
| METR Time Horizons | 66.8% | — |
| Vending-Bench 2 | — | 0.54 |

## Reasoning

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

| Benchmark | Claude Opus 4.1 | Qwen3.5 Plus |
|---|---|---|
| Chess Puzzles | 7% | 22% |
| Mystery Game Puzzles | 21% | 17% |
| DTBench | 80% | 80.5% |
| LMCA | 37.1% | 36.4% |
| Epoch Capabilities Index | 144.12 | 146.78 |
| SimpleBench | 60% | — |
| EnigmaEval | 7.2% | — |
| EBR-Bench | 7.9% | — |
| LMArena Hard Prompts | 1443 | — |
| ForecastBench | 62 | — |

## Math

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

| Benchmark | Claude Opus 4.1 | Qwen3.5 Plus |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 68.9% | 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 4 | 2.4% | — |
| LMArena Math | 1431 | — |

## Knowledge

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

| Benchmark | Claude Opus 4.1 | Qwen3.5 Plus |
|---|---|---|
| GPQA Diamond | 77.3% | 84.8% |
| Vectara Hallucination Rate | 11.8% | 10.7% |
| Humanity's Last Exam | 11.5% | — |
| SimpleQA Verified | — | 25.4% |
| Confabulations | 17.1% | — |
| LMArena Expert | 1439 | — |

## Multimodal

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

| Benchmark | Claude Opus 4.1 | Qwen3.5 Plus |
|---|---|---|
| VPCT | 35% | — |

## Multilingual

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

| Benchmark | Claude Opus 4.1 | Qwen3.5 Plus |
|---|---|---|
| LMArena Non-English | 1405 | — |
| LMArena Chinese | 1427 | — |
| LMArena French | 1431 | — |
| LMArena German | 1413 | — |
| LMArena Japanese | 1378 | — |
| LMArena Korean | 1380 | — |
| LMArena Russian | 1422 | — |
| LMArena Spanish | 1448 | — |

## Instruction Following

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

| Benchmark | Claude Opus 4.1 | Qwen3.5 Plus |
|---|---|---|
| LMArena Instruction Following | 1435 | — |

## Long Context

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

| Benchmark | Claude Opus 4.1 | Qwen3.5 Plus |
|---|---|---|
| CL-bench | — | 19.8% |
| CL-bench Life | — | 12.4% |
| LMArena Longer Query | 1455 | — |

## Writing & Preference

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

| Benchmark | Claude Opus 4.1 | Qwen3.5 Plus |
|---|---|---|
| LMArena Text | 1419 | — |
| LMArena Creative Writing | 1412 | — |
| Short-Story Creative Writing | 84.7% | — |
| LMArena Multi-Turn | 1444 | — |

## FAQ

### 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.