# Claude Sonnet 4 vs Qwen3.5 Plus

> Qwen3.5 Plus is the stronger model overall, scoring 42.3 to 40.6 on the Noometry Index.

- Canonical page: https://noometry.com/compare/claude-sonnet-4-vs-qwen3-5-plus
- Last updated: 2026-10-10
- Shared benchmarks: 9

## 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 long context, where Qwen3.5 Plus leads 42.9 to 33.6.
- 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.

## Snapshot

| | Claude Sonnet 4 | Qwen3.5 Plus |
|---|---|---|
| Provider | Anthropic | Alibaba (Qwen) |
| Noometry Index | 40.6 | 42.3 |
| Rank | 139 | 103 |
| Context | 200K | 1M |
| Input $/M | $3 | $0.40 |
| Output $/M | $15 | $2.40 |
| Weights | Proprietary | Proprietary |

## Coding

- Claude Sonnet 4: 44.0 (#70)
- Qwen3.5 Plus: —

| Benchmark | Claude Sonnet 4 | Qwen3.5 Plus |
|---|---|---|
| ALE-Bench | 655.35 | 621.92 |
| SWE-bench Verified (bash only) | 64.9% | — |
| Aider Polyglot | 61.3% | — |
| SciCode | 40% | — |
| GSO | 4.9% | — |
| WeirdML | 46.1% | — |
| LMArena Coding | 1414 | — |

## Agentic & Tool Use

- Claude Sonnet 4: 38.3 (#29)
- Qwen3.5 Plus: —

| Benchmark | Claude Sonnet 4 | Qwen3.5 Plus |
|---|---|---|
| TheAgentCompany | 33.1% | — |
| Cybench | 35% | — |
| DeepResearch Bench | 46.6% | — |
| OSWorld | 43.9% | — |
| METR Time Horizons | 62% | — |
| Vending-Bench 2 | — | 0.54 |

## Reasoning

- Claude Sonnet 4: 23.0 (#169)
- Qwen3.5 Plus: 32.0 (#67)

| Benchmark | Claude Sonnet 4 | Qwen3.5 Plus |
|---|---|---|
| DTBench | 77.1% | 80.5% |
| LMCA | 29% | 36.4% |
| Epoch Capabilities Index | 141.69 | 146.79 |
| ARC-AGI-2 | 5.9% | — |
| SimpleBench | 45.5% | — |
| Kagi LLM Benchmark | 73% | — |
| ARC-AGI-1 | 40% | — |
| CritPt | 0.3% | — |
| Chess Puzzles | — | 22% |
| EnigmaEval | 3.1% | — |
| LMArena Hard Prompts | 1372 | — |
| Mystery Game Puzzles | — | 17% |
| ForecastBench | 60.2 | — |

## Math

- Claude Sonnet 4: 41.5 (#71)
- Qwen3.5 Plus: 47.9 (#55)

| Benchmark | Claude Sonnet 4 | Qwen3.5 Plus |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 71.1% | 86.7% |
| FrontierMath (Feb 2025 set) | 4.1% | 21% |
| FrontierMath Tier 4 (v1) | 0% | 2.1% |
| Omni-MATH | 60.2% | — |
| LMArena Math | 1375 | — |
| MATH Level 5 | 84.4% | — |

## Knowledge

- Claude Sonnet 4: 41.6 (#99)
- Qwen3.5 Plus: 46.0 (#78)

| Benchmark | Claude Sonnet 4 | Qwen3.5 Plus |
|---|---|---|
| GPQA Diamond | 79.2% | 84.8% |
| Vectara Hallucination Rate | 10.3% | 10.7% |
| Humanity's Last Exam | 7.8% | — |
| SimpleQA Verified | — | 25.4% |
| MMLU-Pro | 84.3% | — |
| Confabulations | 13.2% | — |
| GPQA (HELM) | 70.6% | — |
| LMArena Expert | 1371 | — |

## Multimodal

- Claude Sonnet 4: 25.6 (#116)
- Qwen3.5 Plus: —

| Benchmark | Claude Sonnet 4 | Qwen3.5 Plus |
|---|---|---|
| LMArena Vision | 1191 | — |
| GeoBench | 37% | — |
| VPCT | 34% | — |
| MindCube | 44.8% | — |

## Multilingual

- Claude Sonnet 4: 46.9 (#151)
- Qwen3.5 Plus: —

| Benchmark | Claude Sonnet 4 | Qwen3.5 Plus |
|---|---|---|
| LMArena Non-English | 1333 | — |
| LMArena Chinese | 1351 | — |
| LMArena French | 1364 | — |
| LMArena German | 1331 | — |
| LMArena Japanese | 1301 | — |
| LMArena Korean | 1293 | — |
| LMArena Russian | 1355 | — |
| LMArena Spanish | 1356 | — |

## Instruction Following

- Claude Sonnet 4: 71.8 (#141)
- Qwen3.5 Plus: —

| Benchmark | Claude Sonnet 4 | Qwen3.5 Plus |
|---|---|---|
| IFEval | 84% | — |
| LMArena Instruction Following | 1375 | — |

## Long Context

- Claude Sonnet 4: 33.6 (#254)
- Qwen3.5 Plus: 42.9 (#109)

| Benchmark | Claude Sonnet 4 | Qwen3.5 Plus |
|---|---|---|
| Fiction.LiveBench | 46.9% | — |
| CL-bench | — | 19.8% |
| CL-bench Life | — | 12.4% |
| LMArena Longer Query | 1398 | — |

## Writing & Preference

- Claude Sonnet 4: 57.3 (#127)
- Qwen3.5 Plus: —

| Benchmark | Claude Sonnet 4 | Qwen3.5 Plus |
|---|---|---|
| LMArena Text | 1351 | — |
| LMArena Creative Writing | 1345 | — |
| Short-Story Creative Writing | 81.4% | — |
| EQ-Bench Creative Writing | 1483 | — |
| WildBench | 83.8% | — |
| LMArena Multi-Turn | 1376 | — |

## FAQ

### Is Claude Sonnet 4 better than Qwen3.5 Plus?

Qwen3.5 Plus is the stronger model overall, scoring 42.3 to 40.6 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.