# Grok 3 vs Mistral Small 3.1

> Grok 3 is the stronger model overall, scoring 39.9 to 31.7 on the Noometry Index.

- Canonical page: https://noometry.com/compare/grok-3-vs-mistral-small-3-1
- Last updated: 2026-10-10
- Shared benchmarks: 26

## Summary

- They share 26 benchmarks with published results for both. Grok 3 scores higher in 6 categories and Mistral Small 3.1 in 2 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Grok 3 leads 46.2 to 22.6.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 55.6% for Grok 3 and 3.9% for Mistral Small 3.1.
- Mistral Small 3.1 has downloadable open weights; the other is API-only.

## Snapshot

| | Grok 3 | Mistral Small 3.1 |
|---|---|---|
| Provider | xAI | Mistral AI |
| Noometry Index | 39.9 | 31.7 |
| Rank | 157 | 269 |
| Context | — | 128K |
| Input $/M | — | $0.35 |
| Output $/M | — | $0.56 |
| Weights | Proprietary | Open |

## Coding

- Grok 3: 41.9 (#115)
- Mistral Small 3.1: 38.3 (#179)

| Benchmark | Grok 3 | Mistral Small 3.1 |
|---|---|---|
| LMArena Coding | 1432 | 1309 |
| Aider Polyglot | 53.3% | — |
| WeirdML | 37.2% | — |

## Agentic & Tool Use

- Grok 3: 30.5 (#76)
- Mistral Small 3.1: —

| Benchmark | Grok 3 | Mistral Small 3.1 |
|---|---|---|
| BALROG | 29.5% | — |

## Reasoning

- Grok 3: 13.7 (#333)
- Mistral Small 3.1: 19.7 (#254)

| Benchmark | Grok 3 | Mistral Small 3.1 |
|---|---|---|
| LMArena Hard Prompts | 1434 | 1278 |
| Epoch Capabilities Index | 138.33 | 127.48 |
| ARC-AGI-2 | 0% | — |
| SimpleBench | 36.1% | — |
| Kagi LLM Benchmark | 61.3% | — |
| ARC-AGI-1 | 5.5% | — |
| Chess Puzzles | — | 1% |

## Math

- Grok 3: 38.0 (#145)
- Mistral Small 3.1: 14.7 (#301)

| Benchmark | Grok 3 | Mistral Small 3.1 |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 55.6% | 3.9% |
| Omni-MATH | 46.4% | 24.8% |
| LMArena Math | 1391 | 1262 |
| MATH Level 5 | 88.7% | — |
| FrontierMath (Feb 2025 set) | 3.8% | — |
| FrontierMath Tier 4 (v1) | 0% | — |

## Knowledge

- Grok 3: 46.2 (#82)
- Mistral Small 3.1: 22.6 (#271)

| Benchmark | Grok 3 | Mistral Small 3.1 |
|---|---|---|
| GPQA Diamond | 75.8% | 41.9% |
| MMLU-Pro | 78.8% | 61% |
| GPQA (HELM) | 65% | 39.2% |
| LMArena Expert | 1421 | 1257 |
| Confabulations | 14.2% | — |
| Vectara Hallucination Rate | 5.8% | — |

## Multimodal

- Grok 3: —
- Mistral Small 3.1: 33.2 (#99)

| Benchmark | Grok 3 | Mistral Small 3.1 |
|---|---|---|
| LMArena Vision | — | 1136 |

## Multilingual

- Grok 3: 52.3 (#87)
- Mistral Small 3.1: 41.2 (#209)

| Benchmark | Grok 3 | Mistral Small 3.1 |
|---|---|---|
| LMArena Non-English | 1410 | 1255 |
| LMArena Chinese | 1448 | 1253 |
| LMArena French | 1460 | 1273 |
| LMArena German | 1431 | 1266 |
| LMArena Japanese | 1387 | 1208 |
| LMArena Korean | 1373 | 1206 |
| LMArena Russian | 1416 | 1263 |
| LMArena Spanish | 1417 | 1283 |

## Instruction Following

- Grok 3: 75.0 (#73)
- Mistral Small 3.1: 63.6 (#230)

| Benchmark | Grok 3 | Mistral Small 3.1 |
|---|---|---|
| IFEval | 88.4% | 75% |
| LMArena Instruction Following | 1409 | 1264 |

## Long Context

- Grok 3: 38.7 (#192)
- Mistral Small 3.1: 39.5 (#178)

| Benchmark | Grok 3 | Mistral Small 3.1 |
|---|---|---|
| LMArena Longer Query | 1439 | 1299 |
| Fiction.LiveBench | 58.3% | — |

## Writing & Preference

- Grok 3: 55.8 (#141)
- Mistral Small 3.1: 37.0 (#259)

| Benchmark | Grok 3 | Mistral Small 3.1 |
|---|---|---|
| LMArena Text | 1426 | 1277 |
| LMArena Creative Writing | 1414 | 1253 |
| EQ-Bench Creative Writing | 1186 | 761 |
| WildBench | 84.9% | 78.8% |
| LMArena Multi-Turn | 1425 | 1270 |
| Short-Story Creative Writing | 76.4% | — |

## FAQ

### Is Grok 3 better than Mistral Small 3.1?

Grok 3 is the stronger model overall, scoring 39.9 to 31.7 on the Noometry Index.

### Is Grok 3 or Mistral Small 3.1 better for coding?

Grok 3 scores higher on coding benchmarks: 41.9 versus 38.3 in the Noometry coding category.

### How many benchmarks do Grok 3 and Mistral Small 3.1 share?

26 benchmarks have published results for both models. Grok 3 has 40 scored results on Noometry and Mistral Small 3.1 has 28.