# Llama 3.1-405B vs Step 3

> Step 3 is the stronger model overall, scoring 40.5 to 30.7 on the Noometry Index.

- Canonical page: https://noometry.com/compare/llama-3-1-405b-vs-step-3
- Last updated: 2026-10-10
- Shared benchmarks: 16

## Summary

- They share 16 benchmarks with published results for both. Llama 3.1-405B scores higher in 0 categories and Step 3 in 8 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in math, where Step 3 leads 37.6 to 18.4.
- The biggest single-benchmark swing is Kagi LLM Benchmark: 45% for Llama 3.1-405B and 62.3% for Step 3.

## Snapshot

| | Llama 3.1-405B | Step 3 |
|---|---|---|
| Provider | Meta | StepFun |
| Noometry Index | 30.7 | 40.5 |
| Rank | 288 | 149 |
| Context | — | — |
| Input $/M | — | — |
| Output $/M | — | — |
| Weights | Open | Open |

## Coding

- Llama 3.1-405B: 33.1 (#262)
- Step 3: 40.1 (#147)

| Benchmark | Llama 3.1-405B | Step 3 |
|---|---|---|
| LMArena Coding | 1291 | 1367 |
| WeirdML | 21.4% | — |

## Agentic & Tool Use

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

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

## Reasoning

- Llama 3.1-405B: 16.8 (#300)
- Step 3: 28.4 (#105)

| Benchmark | Llama 3.1-405B | Step 3 |
|---|---|---|
| Kagi LLM Benchmark | 45% | 62.3% |
| LMArena Hard Prompts | 1269 | 1355 |
| SimpleBench | 23% | — |
| 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

- Llama 3.1-405B: 18.4 (#290)
- Step 3: 37.6 (#148)

| Benchmark | Llama 3.1-405B | Step 3 |
|---|---|---|
| LMArena Math | 1281 | 1366 |
| OTIS Mock AIME 2024-2025 | 9.7% | — |
| Omni-MATH | 24.9% | — |
| MATH Level 5 | 49.8% | — |

## Knowledge

- Llama 3.1-405B: 30.4 (#227)
- Step 3: 36.8 (#164)

| Benchmark | Llama 3.1-405B | Step 3 |
|---|---|---|
| LMArena Expert | 1243 | 1333 |
| 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% | — |

## Multimodal

- Llama 3.1-405B: —
- Step 3: 35.5 (#86)

| Benchmark | Llama 3.1-405B | Step 3 |
|---|---|---|
| LMArena Vision | — | 1177 |

## Multilingual

- Llama 3.1-405B: 40.7 (#214)
- Step 3: 46.3 (#159)

| Benchmark | Llama 3.1-405B | Step 3 |
|---|---|---|
| LMArena Non-English | 1248 | 1327 |
| LMArena Chinese | 1242 | 1397 |
| LMArena German | 1252 | 1371 |
| LMArena Korean | 1184 | 1269 |
| LMArena Russian | 1265 | 1331 |
| LMArena Spanish | 1260 | 1371 |
| LMArena French | 1279 | — |
| LMArena Japanese | 1208 | — |

## Instruction Following

- Llama 3.1-405B: 65.9 (#214)
- Step 3: 70.4 (#164)

| Benchmark | Llama 3.1-405B | Step 3 |
|---|---|---|
| LMArena Instruction Following | 1259 | 1332 |
| IFEval | 81.1% | — |

## Long Context

- Llama 3.1-405B: 38.4 (#197)
- Step 3: 40.3 (#157)

| Benchmark | Llama 3.1-405B | Step 3 |
|---|---|---|
| LMArena Longer Query | 1266 | 1326 |

## Writing & Preference

- Llama 3.1-405B: 38.9 (#251)
- Step 3: 54.3 (#151)

| Benchmark | Llama 3.1-405B | Step 3 |
|---|---|---|
| LMArena Text | 1284 | 1350 |
| LMArena Creative Writing | 1262 | 1321 |
| LMArena Multi-Turn | 1297 | 1341 |
| EQ-Bench Creative Writing | 870 | — |
| WildBench | 78.3% | — |

## FAQ

### Is Llama 3.1-405B better than Step 3?

Step 3 is the stronger model overall, scoring 40.5 to 30.7 on the Noometry Index.

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

Step 3 scores higher on coding benchmarks: 40.1 versus 33.1 in the Noometry coding category.

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

16 benchmarks have published results for both models. Llama 3.1-405B has 42 scored results on Noometry and Step 3 has 17.