# Grok 4.1 Fast vs Llama 3-70B

> Grok 4.1 Fast is the stronger model overall, scoring 41.4 to 28.8 on the Noometry Index.

- Canonical page: https://noometry.com/compare/grok-4-1-fast-vs-llama-3-70b
- Last updated: 2026-10-12
- Shared benchmarks: 19

## Summary

- They share 19 benchmarks with published results for both. Grok 4.1 Fast scores higher in 8 categories and Llama 3-70B in 1 category; 9 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Grok 4.1 Fast leads 43.4 to 18.0.
- The biggest single-benchmark swing is DTBench: 87.7% for Grok 4.1 Fast and 54.2% for Llama 3-70B.
- Llama 3-70B has downloadable open weights; the other is API-only.

## Snapshot

| | Grok 4.1 Fast | Llama 3-70B |
|---|---|---|
| Provider | xAI | Meta |
| Noometry Index | 41.4 | 28.8 |
| Rank | 136 | 323 |
| Context | 128K | — |
| Input $/M | $0.20 | — |
| Output $/M | $0.50 | — |
| Weights | Proprietary | Open |

## Coding

- Grok 4.1 Fast: 34.1 (#245)
- Llama 3-70B: 35.8 (#218)

| Benchmark | Grok 4.1 Fast | Llama 3-70B |
|---|---|---|
| LMArena Coding | 1411 | 1206 |
| LMArena WebDev | 1242 | — |
| BigCodeBench Instruct | — | 43.6% |
| BigCodeBench Complete | — | 54.5% |
| ALE-Bench | 394.93 | — |
| HumanEval+ | — | 72% |
| MBPP+ | — | 69% |

## Agentic & Tool Use

- Grok 4.1 Fast: 36.3 (#39)
- Llama 3-70B: 21.1 (#139)

| Benchmark | Grok 4.1 Fast | Llama 3-70B |
|---|---|---|
| Berkeley Function Calling Leaderboard | 69.6% | — |
| τ²-bench Banking | 13.1% | — |
| Cybench | — | 5% |
| LMArena Search | 1171 | — |
| Vending-Bench 2 | 1,107 | — |

## Reasoning

- Grok 4.1 Fast: 43.4 (#49)
- Llama 3-70B: 18.0 (#288)

| Benchmark | Grok 4.1 Fast | Llama 3-70B |
|---|---|---|
| LMArena Hard Prompts | 1407 | 1195 |
| DTBench | 87.7% | 54.2% |
| ForecastBench | 61 | 57.1 |
| SimpleBench | 56% | — |
| Kagi LLM Benchmark | — | 35.1% |
| NYT Connections (extended) | 87.4% | — |
| Epoch Capabilities Index | — | 122.93 |
| WinoGrande | — | 83.5% |

## Math

- Grok 4.1 Fast: 31.9 (#221)
- Llama 3-70B: 12.8 (#305)

| Benchmark | Grok 4.1 Fast | Llama 3-70B |
|---|---|---|
| LMArena Math | 1408 | 1218 |
| MathArena Final-Answer Competitions | 60.9% | — |
| OTIS Mock AIME 2024-2025 | — | 4.3% |
| ProofBench | 4% | — |
| MATH Level 5 | — | 22.6% |

## Knowledge

- Grok 4.1 Fast: 33.1 (#207)
- Llama 3-70B: 20.8 (#277)

| Benchmark | Grok 4.1 Fast | Llama 3-70B |
|---|---|---|
| LMArena Expert | 1399 | 1149 |
| GPQA Diamond | — | 40.6% |
| Vectara Hallucination Rate | 17.8% | — |
| MMLU | — | 79.3% |

## Multimodal

- Grok 4.1 Fast: 37.0 (#76)
- Llama 3-70B: —

| Benchmark | Grok 4.1 Fast | Llama 3-70B |
|---|---|---|
| LMArena Vision | 1201 | — |

## Multilingual

- Grok 4.1 Fast: 51.0 (#114)
- Llama 3-70B: 33.6 (#251)

| Benchmark | Grok 4.1 Fast | Llama 3-70B |
|---|---|---|
| LMArena Non-English | 1391 | 1142 |
| LMArena Chinese | 1441 | 1114 |
| LMArena French | 1415 | 1232 |
| LMArena German | 1404 | 1169 |
| LMArena Japanese | 1349 | 1017 |
| LMArena Korean | 1361 | 1017 |
| LMArena Russian | 1387 | 1159 |
| LMArena Spanish | 1413 | 1241 |

## Instruction Following

- Grok 4.1 Fast: 72.7 (#133)
- Llama 3-70B: 62.5 (#238)

| Benchmark | Grok 4.1 Fast | Llama 3-70B |
|---|---|---|
| LMArena Instruction Following | 1376 | 1194 |

## Long Context

- Grok 4.1 Fast: 42.4 (#126)
- Llama 3-70B: 35.6 (#240)

| Benchmark | Grok 4.1 Fast | Llama 3-70B |
|---|---|---|
| LMArena Longer Query | 1390 | 1174 |

## Writing & Preference

- Grok 4.1 Fast: 57.2 (#131)
- Llama 3-70B: 42.8 (#231)

| Benchmark | Grok 4.1 Fast | Llama 3-70B |
|---|---|---|
| LMArena Text | 1408 | 1221 |
| LMArena Creative Writing | 1394 | 1210 |
| LMArena Multi-Turn | 1389 | 1223 |
| EQ-Bench Creative Writing | 1327 | — |

## FAQ

### Is Grok 4.1 Fast better than Llama 3-70B?

Grok 4.1 Fast is the stronger model overall, scoring 41.4 to 28.8 on the Noometry Index.

### Is Grok 4.1 Fast or Llama 3-70B better for coding?

Llama 3-70B scores higher on coding benchmarks: 35.8 versus 34.1 in the Noometry coding category.

### How many benchmarks do Grok 4.1 Fast and Llama 3-70B share?

19 benchmarks have published results for both models. Grok 4.1 Fast has 32 scored results on Noometry and Llama 3-70B has 31.