# Claude Opus 4.8 vs Qwen3.5 Plus

> Claude Opus 4.8 is the stronger model overall, scoring 60.7 to 42.9 on the Noometry Index. Qwen3.5 Plus costs 11× less per token, which makes it the better buy when Claude Opus 4.8's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/claude-opus-4-8-vs-qwen3-5-plus
- Last updated: 2026-10-12
- Shared benchmarks: 12

## Summary

- They share 12 benchmarks with published results for both. Claude Opus 4.8 scores higher in 4 categories and Qwen3.5 Plus in 0 categories; 4 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Claude Opus 4.8 leads 64.7 to 32.8.
- The biggest single-benchmark swing is SimpleQA Verified: 53% for Claude Opus 4.8 and 25.4% for Qwen3.5 Plus.
- Qwen3.5 Plus is cheaper at $0.40 / $2.40 per million input/output tokens, against $5 / $25 for Claude Opus 4.8.

## Snapshot

| | Claude Opus 4.8 | Qwen3.5 Plus |
|---|---|---|
| Provider | Anthropic | Alibaba (Qwen) |
| Noometry Index | 60.7 | 42.9 |
| Rank | 13 | 106 |
| Context | 1M | 1M |
| Input $/M | $5 | $0.40 |
| Output $/M | $25 | $2.40 |
| Weights | Proprietary | Proprietary |

## Coding

- Claude Opus 4.8: 59.9 (#12)
- Qwen3.5 Plus: —

| Benchmark | Claude Opus 4.8 | Qwen3.5 Plus |
|---|---|---|
| ALE-Bench | 1,564 | 621.92 |
| DeepSWE | 59% | — |
| FrontierCode | 46.5% | — |
| LMArena WebDev | 1556 | — |
| SciCode | 53.5% | — |
| GSO | 47.1% | — |
| WeirdML | 82.9% | — |
| LMArena Coding | 1490 | — |

## Agentic & Tool Use

- Claude Opus 4.8: 47.6 (#11)
- Qwen3.5 Plus: —

| Benchmark | Claude Opus 4.8 | Qwen3.5 Plus |
|---|---|---|
| Vending-Bench 2 | 5,787 | 0.54 |
| APEX-Agents | 48.9% | — |
| OSWorld 2.0 | 20.6% | — |
| Remote Labor Index | 8.3% | — |
| τ²-bench Banking | 39.7% | — |
| DeepResearch Bench | 50.2% | — |
| PostTrainBench | 33.8% | — |
| GBAEval | 70.9% | — |
| GDP.pdf | 24% | — |
| LMArena Search | 1204 | — |

## Reasoning

- Claude Opus 4.8: 64.7 (#16)
- Qwen3.5 Plus: 32.8 (#74)

| Benchmark | Claude Opus 4.8 | Qwen3.5 Plus |
|---|---|---|
| Chess Puzzles | 34% | 22% |
| Mystery Game Puzzles | 36% | 17% |
| DTBench | 94.9% | 80.5% |
| LMCA | 57.5% | 36.4% |
| Epoch Capabilities Index | 158.21 | 146.78 |
| ARC-AGI-2 | 72.1% | — |
| SimpleBench | 64.8% | — |
| Kagi LLM Benchmark | 88.8% | — |
| NYT Connections (extended) | 91.1% | — |
| ARC-AGI-1 | 92.5% | — |
| CritPt | 20.9% | — |
| EnigmaEval | 23.5% | — |
| EBR-Bench | 28.6% | — |
| LMArena Hard Prompts | 1482 | — |
| Surface Evolver Bench | 87.5% | — |
| Bench to the Future 3 | 0.14 | — |
| ForecastBench | 59.9 | — |

## Math

- Claude Opus 4.8: 78.4 (#13)
- Qwen3.5 Plus: 49.6 (#61)

| Benchmark | Claude Opus 4.8 | Qwen3.5 Plus |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 98.3% | 86.7% |
| FrontierMath (Feb 2025 set) | 47.2% | 21% |
| FrontierMath Tier 4 (v1) | 31.3% | 2.1% |
| FrontierMath (Tiers 1-3) | 80% | — |
| FrontierMath Tier 4 | 56.1% | — |
| MathArena Final-Answer Competitions | 91.8% | — |
| ProofBench | 69% | — |
| LMArena Math | 1487 | — |

## Knowledge

- Claude Opus 4.8: 61.3 (#29)
- Qwen3.5 Plus: 46.0 (#83)

| Benchmark | Claude Opus 4.8 | Qwen3.5 Plus |
|---|---|---|
| GPQA Diamond | 91% | 84.8% |
| SimpleQA Verified | 53% | 25.4% |
| Vectara Hallucination Rate | — | 10.7% |
| LMArena Expert | 1502 | — |

## Multimodal

- Claude Opus 4.8: 42.9 (#26)
- Qwen3.5 Plus: —

| Benchmark | Claude Opus 4.8 | Qwen3.5 Plus |
|---|---|---|
| LMArena Vision | 1294 | — |
| Blueprint-Bench 2 | 14.5% | — |
| Furniture Assembly | 42.5% | — |
| LMArena Document | 1475 | — |

## Multilingual

- Claude Opus 4.8: 55.2 (#33)
- Qwen3.5 Plus: —

| Benchmark | Claude Opus 4.8 | Qwen3.5 Plus |
|---|---|---|
| LMArena Non-English | 1450 | — |
| LMArena Chinese | 1507 | — |
| LMArena French | 1481 | — |
| LMArena German | 1472 | — |
| LMArena Japanese | 1440 | — |
| LMArena Korean | 1432 | — |
| LMArena Russian | 1474 | — |
| LMArena Spanish | 1466 | — |

## Instruction Following

- Claude Opus 4.8: 77.4 (#24)
- Qwen3.5 Plus: —

| Benchmark | Claude Opus 4.8 | Qwen3.5 Plus |
|---|---|---|
| LMArena Instruction Following | 1476 | — |

## Long Context

- Claude Opus 4.8: 45.4 (#35)
- Qwen3.5 Plus: 43.0 (#113)

| Benchmark | Claude Opus 4.8 | Qwen3.5 Plus |
|---|---|---|
| CL-bench | — | 19.8% |
| CL-bench Life | — | 12.4% |
| LMArena Longer Query | 1483 | — |

## Writing & Preference

- Claude Opus 4.8: 72.0 (#16)
- Qwen3.5 Plus: —

| Benchmark | Claude Opus 4.8 | Qwen3.5 Plus |
|---|---|---|
| LMArena Text | 1461 | — |
| LMArena Creative Writing | 1454 | — |
| EQ-Bench Creative Writing | 1840 | — |
| EQ-Bench 4 | 1281 | — |
| LMArena Multi-Turn | 1476 | — |

## FAQ

### Is Claude Opus 4.8 better than Qwen3.5 Plus?

Claude Opus 4.8 is the stronger model overall, scoring 60.7 to 42.9 on the Noometry Index. Qwen3.5 Plus costs 11× less per token, which makes it the better buy when Claude Opus 4.8's lead doesn't matter for your workload.

### Which is cheaper, Claude Opus 4.8 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 4.8 lists at $5 and $25.

### Which has the bigger context window?

Both accept 1M tokens.

### How many benchmarks do Claude Opus 4.8 and Qwen3.5 Plus share?

12 benchmarks have published results for both models. Claude Opus 4.8 has 65 scored results on Noometry and Qwen3.5 Plus has 15.