# Grok 4 Fast vs Mistral Small 3.1

> Grok 4 Fast is the stronger model overall, scoring 39.0 to 31.4 on the Noometry Index.

- Canonical page: https://noometry.com/compare/grok-4-fast-vs-mistral-small-3-1
- Last updated: 2026-10-10
- Shared benchmarks: 18

## Summary

- They share 18 benchmarks with published results for both. Grok 4 Fast scores higher in 7 categories and Mistral Small 3.1 in 1 category; 8 gaps are clear of the uncertainty.
- The widest gap is in long context, where Grok 4 Fast leads 63.2 to 39.5.
- Mistral Small 3.1 has downloadable open weights; the other is API-only.

## Snapshot

| | Grok 4 Fast | Mistral Small 3.1 |
|---|---|---|
| Provider | xAI | Mistral AI |
| Noometry Index | 39.0 | 31.4 |
| Rank | 164 | 263 |
| Context | — | 128K |
| Input $/M | — | $0.35 |
| Output $/M | — | $0.56 |
| Weights | Proprietary | Open |

## Coding

- Grok 4 Fast: 32.3 (#264)
- Mistral Small 3.1: 37.7 (#175)

| Benchmark | Grok 4 Fast | Mistral Small 3.1 |
|---|---|---|
| LMArena Coding | 1429 | 1309 |
| LMArena WebDev | 1160 | — |
| WeirdML | 42.9% | — |

## Agentic & Tool Use

- Grok 4 Fast: 29.3 (#80)
- Mistral Small 3.1: —

| Benchmark | Grok 4 Fast | Mistral Small 3.1 |
|---|---|---|
| τ²-bench Banking | 15.7% | — |
| Cybench | 30% | — |
| LMArena Search | 1171 | — |

## Reasoning

- Grok 4 Fast: 22.5 (#179)
- Mistral Small 3.1: 18.9 (#249)

| Benchmark | Grok 4 Fast | Mistral Small 3.1 |
|---|---|---|
| LMArena Hard Prompts | 1413 | 1278 |
| Epoch Capabilities Index | 144.21 | 127.48 |
| ARC-AGI-2 | 5.3% | — |
| Kagi LLM Benchmark | 66.1% | — |
| ARC-AGI-1 | 48.5% | — |
| Chess Puzzles | — | 1% |
| DTBench | 82.7% | — |
| ForecastBench | 60.5 | — |

## Math

- Grok 4 Fast: 36.1 (#126)
- Mistral Small 3.1: 13.7 (#295)

| Benchmark | Grok 4 Fast | Mistral Small 3.1 |
|---|---|---|
| LMArena Math | 1419 | 1261 |
| OTIS Mock AIME 2024-2025 | — | 3.9% |
| Omni-MATH | — | 24.8% |

## Knowledge

- Grok 4 Fast: 31.5 (#211)
- Mistral Small 3.1: 22.6 (#266)

| Benchmark | Grok 4 Fast | Mistral Small 3.1 |
|---|---|---|
| LMArena Expert | 1411 | 1258 |
| GPQA Diamond | — | 41.9% |
| MMLU-Pro | — | 61% |
| Vectara Hallucination Rate | 19.7% | — |
| GPQA (HELM) | — | 39.2% |

## Multimodal

- Grok 4 Fast: —
- Mistral Small 3.1: 32.6 (#93)

| Benchmark | Grok 4 Fast | Mistral Small 3.1 |
|---|---|---|
| LMArena Vision | — | 1136 |

## Multilingual

- Grok 4 Fast: 51.5 (#106)
- Mistral Small 3.1: 41.4 (#204)

| Benchmark | Grok 4 Fast | Mistral Small 3.1 |
|---|---|---|
| LMArena Non-English | 1397 | 1255 |
| LMArena Chinese | 1458 | 1254 |
| LMArena French | 1433 | 1270 |
| LMArena German | 1383 | 1266 |
| LMArena Japanese | 1358 | 1210 |
| LMArena Korean | 1359 | 1206 |
| LMArena Russian | 1387 | 1263 |
| LMArena Spanish | 1414 | 1283 |

## Instruction Following

- Grok 4 Fast: 73.4 (#116)
- Mistral Small 3.1: 63.8 (#225)

| Benchmark | Grok 4 Fast | Mistral Small 3.1 |
|---|---|---|
| LMArena Instruction Following | 1388 | 1264 |
| IFEval | — | 75% |

## Long Context

- Grok 4 Fast: 63.2 (#3)
- Mistral Small 3.1: 39.5 (#172)

| Benchmark | Grok 4 Fast | Mistral Small 3.1 |
|---|---|---|
| LMArena Longer Query | 1415 | 1300 |
| Fiction.LiveBench | 94.4% | — |

## Writing & Preference

- Grok 4 Fast: 60.2 (#96)
- Mistral Small 3.1: 37.2 (#254)

| Benchmark | Grok 4 Fast | Mistral Small 3.1 |
|---|---|---|
| LMArena Text | 1407 | 1278 |
| LMArena Creative Writing | 1388 | 1253 |
| LMArena Multi-Turn | 1414 | 1270 |
| EQ-Bench Creative Writing | — | 761 |
| WildBench | — | 78.8% |

## FAQ

### Is Grok 4 Fast better than Mistral Small 3.1?

Grok 4 Fast is the stronger model overall, scoring 39.0 to 31.4 on the Noometry Index.

### Is Grok 4 Fast or Mistral Small 3.1 better for coding?

Mistral Small 3.1 scores higher on coding benchmarks: 37.7 versus 32.3 in the Noometry coding category.

### How many benchmarks do Grok 4 Fast and Mistral Small 3.1 share?

18 benchmarks have published results for both models. Grok 4 Fast has 30 scored results on Noometry and Mistral Small 3.1 has 28.