# Grok 4.1 Fast vs Mistral Small 3.1

> Grok 4.1 Fast is the stronger model overall, scoring 41.4 to 31.7 on the Noometry Index.

- Canonical page: https://noometry.com/compare/grok-4-1-fast-vs-mistral-small-3-1
- Last updated: 2026-10-10
- Shared benchmarks: 19

## Summary

- They share 19 benchmarks with published results for both. Grok 4.1 Fast scores higher in 8 categories and Mistral Small 3.1 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 19.7.
- Grok 4.1 Fast is cheaper at $0.20 / $0.50 per million input/output tokens, against $0.35 / $0.56 for Mistral Small 3.1.
- Mistral Small 3.1 has downloadable open weights; the other is API-only.

## Snapshot

| | Grok 4.1 Fast | Mistral Small 3.1 |
|---|---|---|
| Provider | xAI | Mistral AI |
| Noometry Index | 41.4 | 31.7 |
| Rank | 136 | 269 |
| Context | 128K | 128K |
| Input $/M | $0.20 | $0.35 |
| Output $/M | $0.50 | $0.56 |
| Weights | Proprietary | Open |

## Coding

- Grok 4.1 Fast: 34.1 (#245)
- Mistral Small 3.1: 38.3 (#179)

| Benchmark | Grok 4.1 Fast | Mistral Small 3.1 |
|---|---|---|
| LMArena Coding | 1411 | 1309 |
| LMArena WebDev | 1242 | — |
| ALE-Bench | 394.93 | — |

## Agentic & Tool Use

- Grok 4.1 Fast: 36.3 (#39)
- Mistral Small 3.1: —

| Benchmark | Grok 4.1 Fast | Mistral Small 3.1 |
|---|---|---|
| Berkeley Function Calling Leaderboard | 69.6% | — |
| τ²-bench Banking | 13.1% | — |
| LMArena Search | 1171 | — |
| Vending-Bench 2 | 1,107 | — |

## Reasoning

- Grok 4.1 Fast: 43.4 (#49)
- Mistral Small 3.1: 19.7 (#254)

| Benchmark | Grok 4.1 Fast | Mistral Small 3.1 |
|---|---|---|
| LMArena Hard Prompts | 1407 | 1278 |
| SimpleBench | 56% | — |
| NYT Connections (extended) | 87.4% | — |
| Chess Puzzles | — | 1% |
| DTBench | 87.7% | — |
| Epoch Capabilities Index | — | 127.48 |
| ForecastBench | 61 | — |

## Math

- Grok 4.1 Fast: 31.9 (#221)
- Mistral Small 3.1: 14.7 (#301)

| Benchmark | Grok 4.1 Fast | Mistral Small 3.1 |
|---|---|---|
| LMArena Math | 1408 | 1262 |
| MathArena Final-Answer Competitions | 60.9% | — |
| OTIS Mock AIME 2024-2025 | — | 3.9% |
| ProofBench | 4% | — |
| Omni-MATH | — | 24.8% |

## Knowledge

- Grok 4.1 Fast: 33.1 (#207)
- Mistral Small 3.1: 22.6 (#271)

| Benchmark | Grok 4.1 Fast | Mistral Small 3.1 |
|---|---|---|
| LMArena Expert | 1399 | 1257 |
| GPQA Diamond | — | 41.9% |
| MMLU-Pro | — | 61% |
| Vectara Hallucination Rate | 17.8% | — |
| GPQA (HELM) | — | 39.2% |

## Multimodal

- Grok 4.1 Fast: 37.0 (#76)
- Mistral Small 3.1: 33.2 (#99)

| Benchmark | Grok 4.1 Fast | Mistral Small 3.1 |
|---|---|---|
| LMArena Vision | 1201 | 1136 |

## Multilingual

- Grok 4.1 Fast: 51.0 (#114)
- Mistral Small 3.1: 41.2 (#209)

| Benchmark | Grok 4.1 Fast | Mistral Small 3.1 |
|---|---|---|
| LMArena Non-English | 1391 | 1255 |
| LMArena Chinese | 1441 | 1253 |
| LMArena French | 1415 | 1273 |
| LMArena German | 1404 | 1266 |
| LMArena Japanese | 1349 | 1208 |
| LMArena Korean | 1361 | 1206 |
| LMArena Russian | 1387 | 1263 |
| LMArena Spanish | 1413 | 1283 |

## Instruction Following

- Grok 4.1 Fast: 72.7 (#133)
- Mistral Small 3.1: 63.6 (#230)

| Benchmark | Grok 4.1 Fast | Mistral Small 3.1 |
|---|---|---|
| LMArena Instruction Following | 1376 | 1264 |
| IFEval | — | 75% |

## Long Context

- Grok 4.1 Fast: 42.4 (#126)
- Mistral Small 3.1: 39.5 (#178)

| Benchmark | Grok 4.1 Fast | Mistral Small 3.1 |
|---|---|---|
| LMArena Longer Query | 1390 | 1299 |

## Writing & Preference

- Grok 4.1 Fast: 57.2 (#131)
- Mistral Small 3.1: 37.0 (#259)

| Benchmark | Grok 4.1 Fast | Mistral Small 3.1 |
|---|---|---|
| LMArena Text | 1408 | 1277 |
| LMArena Creative Writing | 1394 | 1253 |
| EQ-Bench Creative Writing | 1327 | 761 |
| LMArena Multi-Turn | 1389 | 1270 |
| WildBench | — | 78.8% |

## FAQ

### Is Grok 4.1 Fast better than Mistral Small 3.1?

Grok 4.1 Fast is the stronger model overall, scoring 41.4 to 31.7 on the Noometry Index.

### Which is cheaper, Grok 4.1 Fast or Mistral Small 3.1?

Grok 4.1 Fast is cheaper. It lists at $0.20 per million input tokens and $0.50 per million output tokens; Mistral Small 3.1 lists at $0.35 and $0.56.

### Is Grok 4.1 Fast or Mistral Small 3.1 better for coding?

Mistral Small 3.1 scores higher on coding benchmarks: 38.3 versus 34.1 in the Noometry coding category.

### Which has the bigger context window?

Both accept 128K tokens.

### How many benchmarks do Grok 4.1 Fast and Mistral Small 3.1 share?

19 benchmarks have published results for both models. Grok 4.1 Fast has 32 scored results on Noometry and Mistral Small 3.1 has 28.