# Llama 3.1-405B vs Qwen3.5 Plus

> Qwen3.5 Plus is the stronger model overall, scoring 42.9 to 30.7 on the Noometry Index.

- Canonical page: https://noometry.com/compare/llama-3-1-405b-vs-qwen3-5-plus
- Last updated: 2026-10-10
- Shared benchmarks: 4

## Summary

- They share 4 benchmarks with published results for both. Llama 3.1-405B scores higher in 0 categories and Qwen3.5 Plus in 4 categories; 4 gaps are clear of the uncertainty.
- The widest gap is in math, where Qwen3.5 Plus leads 49.6 to 18.4.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 9.7% for Llama 3.1-405B and 86.7% for Qwen3.5 Plus.
- Llama 3.1-405B has downloadable open weights; the other is API-only.

## Snapshot

| | Llama 3.1-405B | Qwen3.5 Plus |
|---|---|---|
| Provider | Meta | Alibaba (Qwen) |
| Noometry Index | 30.7 | 42.9 |
| Rank | 288 | 106 |
| Context | — | 1M |
| Input $/M | — | $0.40 |
| Output $/M | — | $2.40 |
| Weights | Open | Proprietary |

## Coding

- Llama 3.1-405B: 33.1 (#262)
- Qwen3.5 Plus: —

| Benchmark | Llama 3.1-405B | Qwen3.5 Plus |
|---|---|---|
| WeirdML | 21.4% | — |
| LMArena Coding | 1291 | — |
| ALE-Bench | — | 621.92 |

## Agentic & Tool Use

- Llama 3.1-405B: 21.0 (#140)
- Qwen3.5 Plus: —

| Benchmark | Llama 3.1-405B | Qwen3.5 Plus |
|---|---|---|
| TheAgentCompany | 7.4% | — |
| Cybench | 7.5% | — |
| Vending-Bench 2 | — | 0.54 |

## Reasoning

- Llama 3.1-405B: 16.8 (#300)
- Qwen3.5 Plus: 32.8 (#74)

| Benchmark | Llama 3.1-405B | Qwen3.5 Plus |
|---|---|---|
| DTBench | 61.4% | 80.5% |
| Epoch Capabilities Index | 128.75 | 146.78 |
| SimpleBench | 23% | — |
| Kagi LLM Benchmark | 45% | — |
| Chess Puzzles | — | 22% |
| LMArena Hard Prompts | 1269 | — |
| Mystery Game Puzzles | — | 17% |
| LMCA | — | 36.4% |
| BIG-Bench Hard | 82.9% | — |
| ForecastBench | 59.9 | — |
| HellaSwag | 89.2% | — |
| PIQA | 85.9% | — |
| WinoGrande | 89.2% | — |

## Math

- Llama 3.1-405B: 18.4 (#290)
- Qwen3.5 Plus: 49.6 (#61)

| Benchmark | Llama 3.1-405B | Qwen3.5 Plus |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 9.7% | 86.7% |
| Omni-MATH | 24.9% | — |
| LMArena Math | 1281 | — |
| MATH Level 5 | 49.8% | — |
| FrontierMath (Feb 2025 set) | — | 21% |
| FrontierMath Tier 4 (v1) | — | 2.1% |

## Knowledge

- Llama 3.1-405B: 30.4 (#227)
- Qwen3.5 Plus: 46.0 (#83)

| Benchmark | Llama 3.1-405B | Qwen3.5 Plus |
|---|---|---|
| GPQA Diamond | 50.9% | 84.8% |
| SimpleQA Verified | — | 25.4% |
| MMLU-Pro | 72.3% | — |
| Confabulations | 17.6% | — |
| Vectara Hallucination Rate | — | 10.7% |
| GPQA (HELM) | 52.2% | — |
| LMArena Expert | 1243 | — |
| ARC (AI2) Challenge | 95.3% | — |
| MMLU | 84.5% | — |
| TriviaQA | 82.7% | — |

## Multilingual

- Llama 3.1-405B: 40.7 (#214)
- Qwen3.5 Plus: —

| Benchmark | Llama 3.1-405B | Qwen3.5 Plus |
|---|---|---|
| LMArena Non-English | 1248 | — |
| LMArena Chinese | 1242 | — |
| LMArena French | 1279 | — |
| LMArena German | 1252 | — |
| LMArena Japanese | 1208 | — |
| LMArena Korean | 1184 | — |
| LMArena Russian | 1265 | — |
| LMArena Spanish | 1260 | — |

## Instruction Following

- Llama 3.1-405B: 65.9 (#214)
- Qwen3.5 Plus: —

| Benchmark | Llama 3.1-405B | Qwen3.5 Plus |
|---|---|---|
| IFEval | 81.1% | — |
| LMArena Instruction Following | 1259 | — |

## Long Context

- Llama 3.1-405B: 38.4 (#197)
- Qwen3.5 Plus: 43.0 (#113)

| Benchmark | Llama 3.1-405B | Qwen3.5 Plus |
|---|---|---|
| CL-bench | — | 19.8% |
| CL-bench Life | — | 12.4% |
| LMArena Longer Query | 1266 | — |

## Writing & Preference

- Llama 3.1-405B: 38.9 (#251)
- Qwen3.5 Plus: —

| Benchmark | Llama 3.1-405B | Qwen3.5 Plus |
|---|---|---|
| LMArena Text | 1284 | — |
| LMArena Creative Writing | 1262 | — |
| EQ-Bench Creative Writing | 870 | — |
| WildBench | 78.3% | — |
| LMArena Multi-Turn | 1297 | — |

## FAQ

### Is Llama 3.1-405B better than Qwen3.5 Plus?

Qwen3.5 Plus is the stronger model overall, scoring 42.9 to 30.7 on the Noometry Index.

### How many benchmarks do Llama 3.1-405B and Qwen3.5 Plus share?

4 benchmarks have published results for both models. Llama 3.1-405B has 42 scored results on Noometry and Qwen3.5 Plus has 15.