# Claude 3 Sonnet vs Llama 3.1-405B

> Llama 3.1-405B is the stronger model overall, scoring 30.7 to 29.0 on the Noometry Index.

- Canonical page: https://noometry.com/compare/claude-3-sonnet-vs-llama-3-1-405b
- Last updated: 2026-10-12
- Shared benchmarks: 25

## Summary

- They share 25 benchmarks with published results for both. Claude 3 Sonnet scores higher in 2 categories and Llama 3.1-405B in 6 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Llama 3.1-405B leads 30.4 to 21.1.
- The biggest single-benchmark swing is MATH Level 5: 18.2% for Claude 3 Sonnet and 49.8% for Llama 3.1-405B.
- Llama 3.1-405B has downloadable open weights; the other is API-only.

## Snapshot

| | Claude 3 Sonnet | Llama 3.1-405B |
|---|---|---|
| Provider | Anthropic | Meta |
| Noometry Index | 29.0 | 30.7 |
| Rank | 319 | 288 |
| Context | — | — |
| Input $/M | — | — |
| Output $/M | — | — |
| Weights | Proprietary | Open |

## Coding

- Claude 3 Sonnet: 29.6 (#302)
- Llama 3.1-405B: 33.1 (#262)

| Benchmark | Claude 3 Sonnet | Llama 3.1-405B |
|---|---|---|
| WeirdML | 10.2% | 21.4% |
| LMArena Coding | 1223 | 1291 |
| BigCodeBench Instruct | 42.7% | — |
| BigCodeBench Complete | 53.8% | — |
| HumanEval+ | 64% | — |
| MBPP+ | 69.3% | — |

## Agentic & Tool Use

- Claude 3 Sonnet: —
- Llama 3.1-405B: 21.0 (#140)

| Benchmark | Claude 3 Sonnet | Llama 3.1-405B |
|---|---|---|
| TheAgentCompany | — | 7.4% |
| Cybench | — | 7.5% |

## Reasoning

- Claude 3 Sonnet: 20.5 (#237)
- Llama 3.1-405B: 16.8 (#300)

| Benchmark | Claude 3 Sonnet | Llama 3.1-405B |
|---|---|---|
| LMArena Hard Prompts | 1197 | 1269 |
| DTBench | 53.6% | 61.4% |
| Epoch Capabilities Index | 120.7 | 128.75 |
| WinoGrande | 75.1% | 89.2% |
| SimpleBench | — | 23% |
| Kagi LLM Benchmark | — | 45% |
| BIG-Bench Hard | — | 82.9% |
| ForecastBench | — | 59.9 |
| HellaSwag | — | 89.2% |
| PIQA | — | 85.9% |

## Math

- Claude 3 Sonnet: 10.7 (#310)
- Llama 3.1-405B: 18.4 (#290)

| Benchmark | Claude 3 Sonnet | Llama 3.1-405B |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 2.5% | 9.7% |
| LMArena Math | 1213 | 1281 |
| MATH Level 5 | 18.2% | 49.8% |
| Omni-MATH | — | 24.9% |

## Knowledge

- Claude 3 Sonnet: 21.1 (#276)
- Llama 3.1-405B: 30.4 (#227)

| Benchmark | Claude 3 Sonnet | Llama 3.1-405B |
|---|---|---|
| GPQA Diamond | 40.6% | 50.9% |
| LMArena Expert | 1173 | 1243 |
| MMLU | 75.9% | 84.5% |
| MMLU-Pro | — | 72.3% |
| Confabulations | — | 17.6% |
| GPQA (HELM) | — | 52.2% |
| ARC (AI2) Challenge | — | 95.3% |
| TriviaQA | — | 82.7% |

## Multimodal

- Claude 3 Sonnet: 25.2 (#125)
- Llama 3.1-405B: —

| Benchmark | Claude 3 Sonnet | Llama 3.1-405B |
|---|---|---|
| LMArena Vision | 984 | — |

## Multilingual

- Claude 3 Sonnet: 37.8 (#234)
- Llama 3.1-405B: 40.7 (#214)

| Benchmark | Claude 3 Sonnet | Llama 3.1-405B |
|---|---|---|
| LMArena Non-English | 1205 | 1248 |
| LMArena Chinese | 1189 | 1242 |
| LMArena French | 1229 | 1279 |
| LMArena German | 1204 | 1252 |
| LMArena Japanese | 1131 | 1208 |
| LMArena Korean | 1128 | 1184 |
| LMArena Russian | 1227 | 1265 |
| LMArena Spanish | 1204 | 1260 |

## Instruction Following

- Claude 3 Sonnet: 62.8 (#235)
- Llama 3.1-405B: 65.9 (#214)

| Benchmark | Claude 3 Sonnet | Llama 3.1-405B |
|---|---|---|
| LMArena Instruction Following | 1199 | 1259 |
| IFEval | — | 81.1% |

## Long Context

- Claude 3 Sonnet: 36.7 (#228)
- Llama 3.1-405B: 38.4 (#197)

| Benchmark | Claude 3 Sonnet | Llama 3.1-405B |
|---|---|---|
| LMArena Longer Query | 1211 | 1266 |

## Writing & Preference

- Claude 3 Sonnet: 42.1 (#238)
- Llama 3.1-405B: 38.9 (#251)

| Benchmark | Claude 3 Sonnet | Llama 3.1-405B |
|---|---|---|
| LMArena Text | 1218 | 1284 |
| LMArena Creative Writing | 1186 | 1262 |
| LMArena Multi-Turn | 1227 | 1297 |
| EQ-Bench Creative Writing | — | 870 |
| WildBench | — | 78.3% |

## FAQ

### Is Claude 3 Sonnet better than Llama 3.1-405B?

Llama 3.1-405B is the stronger model overall, scoring 30.7 to 29.0 on the Noometry Index.

### Is Claude 3 Sonnet or Llama 3.1-405B better for coding?

Llama 3.1-405B scores higher on coding benchmarks: 33.1 versus 29.6 in the Noometry coding category.

### How many benchmarks do Claude 3 Sonnet and Llama 3.1-405B share?

25 benchmarks have published results for both models. Claude 3 Sonnet has 30 scored results on Noometry and Llama 3.1-405B has 42.