# Claude Sonnet 4.5 vs Qwen3.5 Plus

> Claude Sonnet 4.5 is the stronger model overall, scoring 44.0 to 42.3 on the Noometry Index. Qwen3.5 Plus costs 6.7× less per token, which makes it the better buy when Claude Sonnet 4.5's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/claude-sonnet-4-5-vs-qwen3-5-plus
- Last updated: 2026-10-10
- Shared benchmarks: 13

## Summary

- They share 13 benchmarks with published results for both. Claude Sonnet 4.5 scores higher in 2 categories and Qwen3.5 Plus in 2 categories; 4 gaps are clear of the uncertainty.
- The widest gap is in math, where Qwen3.5 Plus leads 47.9 to 31.9.
- The biggest single-benchmark swing is Chess Puzzles: 12% for Claude Sonnet 4.5 and 22% 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 4.5.

## Snapshot

| | Claude Sonnet 4.5 | Qwen3.5 Plus |
|---|---|---|
| Provider | Anthropic | Alibaba (Qwen) |
| Noometry Index | 44.0 | 42.3 |
| Rank | 76 | 103 |
| Context | 1M | 1M |
| Input $/M | $3 | $0.40 |
| Output $/M | $15 | $2.40 |
| Weights | Proprietary | Proprietary |

## Coding

- Claude Sonnet 4.5: 47.8 (#54)
- Qwen3.5 Plus: —

| Benchmark | Claude Sonnet 4.5 | Qwen3.5 Plus |
|---|---|---|
| ALE-Bench | 796.15 | 621.92 |
| SWE-bench Verified | 71.3% | — |
| SWE-bench Verified (bash only) | 71.4% | — |
| LMArena WebDev | 1393 | — |
| SWE-bench Multilingual | 67% | — |
| SciCode | 44.7% | — |
| GSO | 14.7% | — |
| WeirdML | 47.7% | — |
| LMArena Coding | 1489 | — |
| AlgoTune | 1.52 | — |

## Agentic & Tool Use

- Claude Sonnet 4.5: 38.1 (#30)
- Qwen3.5 Plus: —

| Benchmark | Claude Sonnet 4.5 | Qwen3.5 Plus |
|---|---|---|
| Vending-Bench 2 | 3,839 | 0.54 |
| Terminal-Bench | 46.5% | — |
| Berkeley Function Calling Leaderboard | 73.2% | — |
| GDPval | 42.5% | — |
| Remote Labor Index | 2.1% | — |
| τ²-bench Airline | 72% | — |
| τ²-bench Banking | 25.3% | — |
| τ²-bench Retail | 72.4% | — |
| τ²-bench Telecom | 84.9% | — |
| Cybench | 60% | — |
| DeepResearch Bench | 52.6% | — |
| OSWorld | 62.9% | — |
| LMArena Search | 1159 | — |
| METR Time Horizons | 67.4% | — |

## Reasoning

- Claude Sonnet 4.5: 26.9 (#113)
- Qwen3.5 Plus: 32.0 (#67)

| Benchmark | Claude Sonnet 4.5 | Qwen3.5 Plus |
|---|---|---|
| Chess Puzzles | 12% | 22% |
| Mystery Game Puzzles | 17% | 17% |
| DTBench | 83.2% | 80.5% |
| LMCA | 38.8% | 36.4% |
| Epoch Capabilities Index | 146.84 | 146.79 |
| ARC-AGI-2 | 13.6% | — |
| SimpleBench | 54.3% | — |
| Kagi LLM Benchmark | 57.9% | — |
| NYT Connections (extended) | 37.3% | — |
| ARC-AGI-1 | 63.7% | — |
| CritPt | 1.1% | — |
| EnigmaEval | 6% | — |
| EBR-Bench | 2.4% | — |
| LMArena Hard Prompts | 1462 | — |
| ForecastBench | 61.9 | — |

## Math

- Claude Sonnet 4.5: 31.9 (#190)
- Qwen3.5 Plus: 47.9 (#55)

| Benchmark | Claude Sonnet 4.5 | Qwen3.5 Plus |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 77.8% | 86.7% |
| FrontierMath (Feb 2025 set) | 15.2% | 21% |
| FrontierMath Tier 4 (v1) | 4.2% | 2.1% |
| FrontierMath (Tiers 1-3) | 23.9% | — |
| FrontierMath Tier 4 | 2.4% | — |
| ProofBench | 19% | — |
| Omni-MATH | 55.3% | — |
| LMArena Math | 1448 | — |
| MATH Level 5 | 97.7% | — |

## Knowledge

- Claude Sonnet 4.5: 48.4 (#70)
- Qwen3.5 Plus: 46.0 (#78)

| Benchmark | Claude Sonnet 4.5 | Qwen3.5 Plus |
|---|---|---|
| GPQA Diamond | 82.3% | 84.8% |
| SimpleQA Verified | 30.7% | 25.4% |
| Vectara Hallucination Rate | 12% | 10.7% |
| Humanity's Last Exam | 13.7% | — |
| MMLU-Pro | 86.9% | — |
| GPQA (HELM) | 68.6% | — |
| LMArena Expert | 1483 | — |

## Multimodal

- Claude Sonnet 4.5: 34.1 (#84)
- Qwen3.5 Plus: —

| Benchmark | Claude Sonnet 4.5 | Qwen3.5 Plus |
|---|---|---|
| VPCT | 39.8% | — |
| LMArena Document | 1450 | — |

## Multilingual

- Claude Sonnet 4.5: 53.6 (#65)
- Qwen3.5 Plus: —

| Benchmark | Claude Sonnet 4.5 | Qwen3.5 Plus |
|---|---|---|
| LMArena Non-English | 1425 | — |
| LMArena Chinese | 1459 | — |
| LMArena French | 1459 | — |
| LMArena German | 1427 | — |
| LMArena Japanese | 1390 | — |
| LMArena Korean | 1403 | — |
| LMArena Russian | 1436 | — |
| LMArena Spanish | 1457 | — |

## Instruction Following

- Claude Sonnet 4.5: 75.2 (#74)
- Qwen3.5 Plus: —

| Benchmark | Claude Sonnet 4.5 | Qwen3.5 Plus |
|---|---|---|
| IFEval | 85% | — |
| LMArena Instruction Following | 1459 | — |

## Long Context

- Claude Sonnet 4.5: 45.2 (#45)
- Qwen3.5 Plus: 42.9 (#109)

| Benchmark | Claude Sonnet 4.5 | Qwen3.5 Plus |
|---|---|---|
| CL-bench | — | 19.8% |
| CL-bench Life | — | 12.4% |
| LMArena Longer Query | 1476 | — |

## Writing & Preference

- Claude Sonnet 4.5: 66.7 (#33)
- Qwen3.5 Plus: —

| Benchmark | Claude Sonnet 4.5 | Qwen3.5 Plus |
|---|---|---|
| LMArena Text | 1439 | — |
| LMArena Creative Writing | 1442 | — |
| EQ-Bench Creative Writing | 1678 | — |
| WildBench | 85.4% | — |
| LMArena Multi-Turn | 1465 | — |

## FAQ

### Is Claude Sonnet 4.5 better than Qwen3.5 Plus?

Claude Sonnet 4.5 is the stronger model overall, scoring 44.0 to 42.3 on the Noometry Index. Qwen3.5 Plus costs 6.7× less per token, which makes it the better buy when Claude Sonnet 4.5's lead doesn't matter for your workload.

### Which is cheaper, Claude Sonnet 4.5 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 4.5 lists at $3 and $15.

### Which has the bigger context window?

Both accept 1M tokens.

### How many benchmarks do Claude Sonnet 4.5 and Qwen3.5 Plus share?

13 benchmarks have published results for both models. Claude Sonnet 4.5 has 73 scored results on Noometry and Qwen3.5 Plus has 15.