# Grok 4.1 vs Llama 3.1-405B

> Grok 4.1 is the stronger model overall, scoring 41.5 to 30.7 on the Noometry Index.

- Canonical page: https://noometry.com/compare/grok-4-1-vs-llama-3-1-405b
- Last updated: 2026-10-12
- Shared benchmarks: 18

## Summary

- They share 18 benchmarks with published results for both. Grok 4.1 scores higher in 9 categories and Llama 3.1-405B in 0 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where Grok 4.1 leads 62.4 to 38.9.
- The biggest single-benchmark swing is Cybench: 39% for Grok 4.1 and 7.5% for Llama 3.1-405B.
- Llama 3.1-405B has downloadable open weights; the other is API-only.

## Snapshot

| | Grok 4.1 | Llama 3.1-405B |
|---|---|---|
| Provider | xAI | Meta |
| Noometry Index | 41.5 | 30.7 |
| Rank | 134 | 288 |
| Context | — | — |
| Input $/M | — | — |
| Output $/M | — | — |
| Weights | Proprietary | Open |

## Coding

- Grok 4.1: 33.7 (#253)
- Llama 3.1-405B: 33.1 (#262)

| Benchmark | Grok 4.1 | Llama 3.1-405B |
|---|---|---|
| LMArena Coding | 1445 | 1291 |
| LMArena WebDev | 1214 | — |
| WeirdML | — | 21.4% |

## Agentic & Tool Use

- Grok 4.1: 34.1 (#49)
- Llama 3.1-405B: 21.0 (#140)

| Benchmark | Grok 4.1 | Llama 3.1-405B |
|---|---|---|
| Cybench | 39% | 7.5% |
| TheAgentCompany | — | 7.4% |

## Reasoning

- Grok 4.1: 29.5 (#91)
- Llama 3.1-405B: 16.8 (#300)

| Benchmark | Grok 4.1 | Llama 3.1-405B |
|---|---|---|
| LMArena Hard Prompts | 1435 | 1269 |
| SimpleBench | — | 23% |
| Kagi LLM Benchmark | — | 45% |
| DTBench | — | 61.4% |
| BIG-Bench Hard | — | 82.9% |
| Epoch Capabilities Index | — | 128.75 |
| ForecastBench | — | 59.9 |
| HellaSwag | — | 89.2% |
| PIQA | — | 85.9% |
| WinoGrande | — | 89.2% |

## Math

- Grok 4.1: 38.9 (#120)
- Llama 3.1-405B: 18.4 (#290)

| Benchmark | Grok 4.1 | Llama 3.1-405B |
|---|---|---|
| LMArena Math | 1422 | 1281 |
| OTIS Mock AIME 2024-2025 | — | 9.7% |
| Omni-MATH | — | 24.9% |
| MATH Level 5 | — | 49.8% |

## Knowledge

- Grok 4.1: 39.5 (#133)
- Llama 3.1-405B: 30.4 (#227)

| Benchmark | Grok 4.1 | Llama 3.1-405B |
|---|---|---|
| LMArena Expert | 1417 | 1243 |
| GPQA Diamond | — | 50.9% |
| MMLU-Pro | — | 72.3% |
| Confabulations | — | 17.6% |
| GPQA (HELM) | — | 52.2% |
| ARC (AI2) Challenge | — | 95.3% |
| MMLU | — | 84.5% |
| TriviaQA | — | 82.7% |

## Multilingual

- Grok 4.1: 53.4 (#68)
- Llama 3.1-405B: 40.7 (#214)

| Benchmark | Grok 4.1 | Llama 3.1-405B |
|---|---|---|
| LMArena Non-English | 1425 | 1248 |
| LMArena Chinese | 1465 | 1242 |
| LMArena French | 1448 | 1279 |
| LMArena German | 1446 | 1252 |
| LMArena Japanese | 1397 | 1208 |
| LMArena Korean | 1407 | 1184 |
| LMArena Russian | 1434 | 1265 |
| LMArena Spanish | 1438 | 1260 |

## Instruction Following

- Grok 4.1: 73.8 (#111)
- Llama 3.1-405B: 65.9 (#214)

| Benchmark | Grok 4.1 | Llama 3.1-405B |
|---|---|---|
| LMArena Instruction Following | 1400 | 1259 |
| IFEval | — | 81.1% |

## Long Context

- Grok 4.1: 43.2 (#100)
- Llama 3.1-405B: 38.4 (#197)

| Benchmark | Grok 4.1 | Llama 3.1-405B |
|---|---|---|
| LMArena Longer Query | 1416 | 1266 |

## Writing & Preference

- Grok 4.1: 62.4 (#75)
- Llama 3.1-405B: 38.9 (#251)

| Benchmark | Grok 4.1 | Llama 3.1-405B |
|---|---|---|
| LMArena Text | 1437 | 1284 |
| LMArena Creative Writing | 1411 | 1262 |
| LMArena Multi-Turn | 1437 | 1297 |
| EQ-Bench Creative Writing | — | 870 |
| WildBench | — | 78.3% |

## FAQ

### Is Grok 4.1 better than Llama 3.1-405B?

Grok 4.1 is the stronger model overall, scoring 41.5 to 30.7 on the Noometry Index.

### Is Grok 4.1 or Llama 3.1-405B better for coding?

They score almost the same on coding (33.7 vs 33.1); test both on your own repository before choosing.

### How many benchmarks do Grok 4.1 and Llama 3.1-405B share?

18 benchmarks have published results for both models. Grok 4.1 has 19 scored results on Noometry and Llama 3.1-405B has 42.