# Grok 4 Fast vs Mistral Small 3

> Grok 4 Fast is the stronger model overall, scoring 39.4 to 31.2 on the Noometry Index.

- Canonical page: https://noometry.com/compare/grok-4-fast-vs-mistral-small-3
- Last updated: 2026-10-10
- Shared benchmarks: 17

## Summary

- They share 17 benchmarks with published results for both. Grok 4 Fast scores higher in 7 categories and Mistral Small 3 in 1 category; 8 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where Grok 4 Fast leads 60.0 to 32.2.
- Mistral Small 3 has downloadable open weights; the other is API-only.

## Snapshot

| | Grok 4 Fast | Mistral Small 3 |
|---|---|---|
| Provider | xAI | Mistral AI |
| Noometry Index | 39.4 | 31.2 |
| Rank | 167 | 278 |
| Context | — | 33K |
| Input $/M | — | $0.05 |
| Output $/M | — | $0.08 |
| Weights | Proprietary | Open |

## Coding

- Grok 4 Fast: 32.5 (#271)
- Mistral Small 3: 36.5 (#207)

| Benchmark | Grok 4 Fast | Mistral Small 3 |
|---|---|---|
| LMArena Coding | 1429 | 1246 |
| LMArena WebDev | 1159 | — |
| WeirdML | 42.9% | — |
| BigCodeBench Instruct | — | 45.3% |
| BigCodeBench Complete | — | 50.4% |

## Agentic & Tool Use

- Grok 4 Fast: 29.5 (#86)
- Mistral Small 3: —

| Benchmark | Grok 4 Fast | Mistral Small 3 |
|---|---|---|
| τ²-bench Banking | 15.7% | — |
| Cybench | 30% | — |
| LMArena Search | 1171 | — |

## Reasoning

- Grok 4 Fast: 22.2 (#201)
- Mistral Small 3: 18.9 (#273)

| Benchmark | Grok 4 Fast | Mistral Small 3 |
|---|---|---|
| LMArena Hard Prompts | 1412 | 1233 |
| Epoch Capabilities Index | 144.2 | 127.07 |
| ARC-AGI-2 | 5.3% | — |
| Kagi LLM Benchmark | 66.1% | — |
| ARC-AGI-1 | 48.5% | — |
| Chess Puzzles | — | 0% |
| DTBench | 82.7% | — |
| ForecastBench | 60.5 | — |

## Math

- Grok 4 Fast: 38.9 (#123)
- Mistral Small 3: 16.3 (#295)

| Benchmark | Grok 4 Fast | Mistral Small 3 |
|---|---|---|
| LMArena Math | 1419 | 1240 |
| OTIS Mock AIME 2024-2025 | — | 6.7% |

## Knowledge

- Grok 4 Fast: 32.0 (#214)
- Mistral Small 3: 25.1 (#263)

| Benchmark | Grok 4 Fast | Mistral Small 3 |
|---|---|---|
| LMArena Expert | 1411 | 1202 |
| GPQA Diamond | — | 47.3% |
| Confabulations | — | 25.2% |
| Vectara Hallucination Rate | 19.7% | — |

## Multilingual

- Grok 4 Fast: 51.3 (#111)
- Mistral Small 3: 37.3 (#236)

| Benchmark | Grok 4 Fast | Mistral Small 3 |
|---|---|---|
| LMArena Non-English | 1396 | 1198 |
| LMArena Chinese | 1457 | 1204 |
| LMArena French | 1431 | 1203 |
| LMArena German | 1383 | 1211 |
| LMArena Japanese | 1352 | 1111 |
| LMArena Korean | 1357 | 1188 |
| LMArena Russian | 1389 | 1216 |
| LMArena Spanish | 1415 | — |

## Instruction Following

- Grok 4 Fast: 73.2 (#121)
- Mistral Small 3: 63.7 (#229)

| Benchmark | Grok 4 Fast | Mistral Small 3 |
|---|---|---|
| LMArena Instruction Following | 1387 | 1214 |

## Long Context

- Grok 4 Fast: 63.2 (#3)
- Mistral Small 3: 37.8 (#211)

| Benchmark | Grok 4 Fast | Mistral Small 3 |
|---|---|---|
| LMArena Longer Query | 1415 | 1246 |
| Fiction.LiveBench | 94.4% | — |

## Writing & Preference

- Grok 4 Fast: 60.0 (#102)
- Mistral Small 3: 32.2 (#280)

| Benchmark | Grok 4 Fast | Mistral Small 3 |
|---|---|---|
| LMArena Text | 1407 | 1234 |
| LMArena Creative Writing | 1387 | 1195 |
| LMArena Multi-Turn | 1414 | 1217 |
| EQ-Bench Creative Writing | — | 707 |

## FAQ

### Is Grok 4 Fast better than Mistral Small 3?

Grok 4 Fast is the stronger model overall, scoring 39.4 to 31.2 on the Noometry Index.

### Is Grok 4 Fast or Mistral Small 3 better for coding?

Mistral Small 3 scores higher on coding benchmarks: 36.5 versus 32.5 in the Noometry coding category.

### How many benchmarks do Grok 4 Fast and Mistral Small 3 share?

17 benchmarks have published results for both models. Grok 4 Fast has 30 scored results on Noometry and Mistral Small 3 has 24.