# Grok 3 vs Mistral Medium 3.5

> Grok 3 and Mistral Medium 3.5 score almost the same on the Noometry Index (39.9 vs 40.2), so choose on price, context window or the category you care about most.

- Canonical page: https://noometry.com/compare/grok-3-vs-mistral-medium-3-5
- Last updated: 2026-10-10
- Shared benchmarks: 18

## Summary

- They share 18 benchmarks with published results for both. Grok 3 scores higher in 4 categories and Mistral Medium 3.5 in 4 categories; 6 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Grok 3 leads 46.2 to 40.0.
- The biggest single-benchmark swing is Kagi LLM Benchmark: 61.3% for Grok 3 and 41.4% for Mistral Medium 3.5.
- Mistral Medium 3.5 has downloadable open weights; the other is API-only.

## Snapshot

| | Grok 3 | Mistral Medium 3.5 |
|---|---|---|
| Provider | xAI | Mistral AI |
| Noometry Index | 39.9 | 40.2 |
| Rank | 157 | 152 |
| Context | — | 262K |
| Input $/M | — | $1.50 |
| Output $/M | — | $7.50 |
| Weights | Proprietary | Open |

## Coding

- Grok 3: 41.9 (#115)
- Mistral Medium 3.5: 36.0 (#213)

| Benchmark | Grok 3 | Mistral Medium 3.5 |
|---|---|---|
| LMArena Coding | 1432 | 1461 |
| Aider Polyglot | 53.3% | — |
| LMArena WebDev | — | 1264 |
| WeirdML | 37.2% | — |

## Agentic & Tool Use

- Grok 3: 30.5 (#76)
- Mistral Medium 3.5: —

| Benchmark | Grok 3 | Mistral Medium 3.5 |
|---|---|---|
| BALROG | 29.5% | — |

## Reasoning

- Grok 3: 13.7 (#333)
- Mistral Medium 3.5: 17.3 (#295)

| Benchmark | Grok 3 | Mistral Medium 3.5 |
|---|---|---|
| Kagi LLM Benchmark | 61.3% | 41.4% |
| LMArena Hard Prompts | 1434 | 1436 |
| Epoch Capabilities Index | 138.33 | 141.35 |
| ARC-AGI-2 | 0% | — |
| SimpleBench | 36.1% | — |
| NYT Connections (extended) | — | 12.9% |
| ARC-AGI-1 | 5.5% | — |

## Math

- Grok 3: 38.0 (#145)
- Mistral Medium 3.5: 39.1 (#113)

| Benchmark | Grok 3 | Mistral Medium 3.5 |
|---|---|---|
| LMArena Math | 1391 | 1431 |
| OTIS Mock AIME 2024-2025 | 55.6% | — |
| Omni-MATH | 46.4% | — |
| MATH Level 5 | 88.7% | — |
| FrontierMath (Feb 2025 set) | 3.8% | — |
| FrontierMath Tier 4 (v1) | 0% | — |

## Knowledge

- Grok 3: 46.2 (#82)
- Mistral Medium 3.5: 40.0 (#126)

| Benchmark | Grok 3 | Mistral Medium 3.5 |
|---|---|---|
| LMArena Expert | 1421 | 1432 |
| GPQA Diamond | 75.8% | — |
| MMLU-Pro | 78.8% | — |
| Confabulations | 14.2% | — |
| Vectara Hallucination Rate | 5.8% | — |
| GPQA (HELM) | 65% | — |

## Multimodal

- Grok 3: —
- Mistral Medium 3.5: 38.3 (#65)

| Benchmark | Grok 3 | Mistral Medium 3.5 |
|---|---|---|
| LMArena Vision | — | 1223 |

## Multilingual

- Grok 3: 52.3 (#87)
- Mistral Medium 3.5: 51.9 (#100)

| Benchmark | Grok 3 | Mistral Medium 3.5 |
|---|---|---|
| LMArena Non-English | 1410 | 1404 |
| LMArena Chinese | 1448 | 1442 |
| LMArena French | 1460 | 1448 |
| LMArena German | 1431 | 1451 |
| LMArena Korean | 1373 | 1385 |
| LMArena Russian | 1416 | 1395 |
| LMArena Spanish | 1417 | 1409 |
| LMArena Japanese | 1387 | — |

## Instruction Following

- Grok 3: 75.0 (#73)
- Mistral Medium 3.5: 74.6 (#90)

| Benchmark | Grok 3 | Mistral Medium 3.5 |
|---|---|---|
| LMArena Instruction Following | 1409 | 1415 |
| IFEval | 88.4% | — |

## Long Context

- Grok 3: 38.7 (#192)
- Mistral Medium 3.5: 43.2 (#103)

| Benchmark | Grok 3 | Mistral Medium 3.5 |
|---|---|---|
| LMArena Longer Query | 1439 | 1415 |
| Fiction.LiveBench | 58.3% | — |

## Writing & Preference

- Grok 3: 55.8 (#141)
- Mistral Medium 3.5: 58.5 (#117)

| Benchmark | Grok 3 | Mistral Medium 3.5 |
|---|---|---|
| LMArena Text | 1426 | 1421 |
| LMArena Creative Writing | 1414 | 1374 |
| LMArena Multi-Turn | 1425 | 1423 |
| Short-Story Creative Writing | 76.4% | — |
| EQ-Bench Creative Writing | 1186 | — |
| WildBench | 84.9% | — |
| EQ-Bench 4 | — | 993 |

## FAQ

### Is Grok 3 better than Mistral Medium 3.5?

Grok 3 and Mistral Medium 3.5 score almost the same on the Noometry Index (39.9 vs 40.2), so choose on price, context window or the category you care about most.

### Is Grok 3 or Mistral Medium 3.5 better for coding?

Grok 3 scores higher on coding benchmarks: 41.9 versus 36.0 in the Noometry coding category.

### How many benchmarks do Grok 3 and Mistral Medium 3.5 share?

18 benchmarks have published results for both models. Grok 3 has 40 scored results on Noometry and Mistral Medium 3.5 has 22.