# Grok 4.1 Fast vs Llama 13b

> Grok 4.1 Fast is the stronger model overall, scoring 40.9 to 23.9 on the Noometry Index.

- Canonical page: https://noometry.com/compare/grok-4-1-fast-vs-llama-13b
- Last updated: 2026-10-10
- Shared benchmarks: 8

## Summary

- They share 8 benchmarks with published results for both. Grok 4.1 Fast scores higher in 6 categories and Llama 13b in 0 categories; 6 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where Grok 4.1 Fast leads 57.4 to 13.9.
- Llama 13b has downloadable open weights; the other is API-only.

## Snapshot

| | Grok 4.1 Fast | Llama 13b |
|---|---|---|
| Provider | xAI | Meta |
| Noometry Index | 40.9 | 23.9 |
| Rank | 131 | 344 |
| Context | 128K | — |
| Input $/M | $0.20 | — |
| Output $/M | $0.50 | — |
| Weights | Proprietary | Open |

## Coding

- Grok 4.1 Fast: 33.8 (#236)
- Llama 13b: 20.9 (#332)

| Benchmark | Grok 4.1 Fast | Llama 13b |
|---|---|---|
| LMArena Coding | 1411 | 683 |
| LMArena WebDev | 1241 | — |
| ALE-Bench | 394.93 | — |

## Agentic & Tool Use

- Grok 4.1 Fast: 36.1 (#35)
- Llama 13b: —

| Benchmark | Grok 4.1 Fast | Llama 13b |
|---|---|---|
| Berkeley Function Calling Leaderboard | 69.6% | — |
| τ²-bench Banking | 13.1% | — |
| LMArena Search | 1171 | — |
| Vending-Bench 2 | 1,107 | — |

## Reasoning

- Grok 4.1 Fast: 42.3 (#45)
- Llama 13b: 13.4 (#327)

| Benchmark | Grok 4.1 Fast | Llama 13b |
|---|---|---|
| LMArena Hard Prompts | 1407 | 728 |
| SimpleBench | 56% | — |
| NYT Connections (extended) | 87.4% | — |
| DTBench | 87.7% | — |
| BIG-Bench Hard | — | 37.9% |
| Epoch Capabilities Index | — | 100.09 |
| ForecastBench | 61 | — |
| HellaSwag | — | 79.2% |
| LAMBADA | — | 75.2% |
| PIQA | — | 80.1% |
| WinoGrande | — | 73% |

## Math

- Grok 4.1 Fast: 30.9 (#201)
- Llama 13b: 24.4 (#259)

| Benchmark | Grok 4.1 Fast | Llama 13b |
|---|---|---|
| LMArena Math | 1408 | 838 |
| MathArena Final-Answer Competitions | 60.9% | — |
| ProofBench | 4% | — |
| GSM8K | — | 20.6% |

## Knowledge

- Grok 4.1 Fast: 32.6 (#203)
- Llama 13b: —

| Benchmark | Grok 4.1 Fast | Llama 13b |
|---|---|---|
| Vectara Hallucination Rate | 17.8% | — |
| LMArena Expert | 1398 | — |
| ARC (AI2) Challenge | — | 52.7% |
| BoolQ | — | 78.7% |
| MMLU | — | 47.7% |
| OpenBookQA | — | 56.4% |
| TriviaQA | — | 77.9% |

## Multimodal

- Grok 4.1 Fast: 36.3 (#71)
- Llama 13b: —

| Benchmark | Grok 4.1 Fast | Llama 13b |
|---|---|---|
| LMArena Vision | 1201 | — |
| ScienceQA | — | 43.3% |

## Multilingual

- Grok 4.1 Fast: 51.1 (#110)
- Llama 13b: 16.8 (#292)

| Benchmark | Grok 4.1 Fast | Llama 13b |
|---|---|---|
| LMArena Non-English | 1391 | 819 |
| LMArena Chinese | 1441 | — |
| LMArena French | 1416 | — |
| LMArena German | 1404 | — |
| LMArena Japanese | 1347 | — |
| LMArena Korean | 1361 | — |
| LMArena Russian | 1387 | — |
| LMArena Spanish | 1411 | — |

## Instruction Following

- Grok 4.1 Fast: 72.8 (#127)
- Llama 13b: 36.9 (#300)

| Benchmark | Grok 4.1 Fast | Llama 13b |
|---|---|---|
| LMArena Instruction Following | 1376 | 781 |

## Long Context

- Grok 4.1 Fast: 42.4 (#121)
- Llama 13b: —

| Benchmark | Grok 4.1 Fast | Llama 13b |
|---|---|---|
| LMArena Longer Query | 1390 | — |

## Writing & Preference

- Grok 4.1 Fast: 57.4 (#126)
- Llama 13b: 13.9 (#307)

| Benchmark | Grok 4.1 Fast | Llama 13b |
|---|---|---|
| LMArena Text | 1408 | 834 |
| LMArena Creative Writing | 1394 | 794 |
| LMArena Multi-Turn | 1389 | 753 |
| EQ-Bench Creative Writing | 1327 | — |

## FAQ

### Is Grok 4.1 Fast better than Llama 13b?

Grok 4.1 Fast is the stronger model overall, scoring 40.9 to 23.9 on the Noometry Index.

### Is Grok 4.1 Fast or Llama 13b better for coding?

Grok 4.1 Fast scores higher on coding benchmarks: 33.8 versus 20.9 in the Noometry coding category.

### How many benchmarks do Grok 4.1 Fast and Llama 13b share?

8 benchmarks have published results for both models. Grok 4.1 Fast has 32 scored results on Noometry and Llama 13b has 21.