# Grok 4 Fast vs Mistral Medium

> Grok 4 Fast is the stronger model overall, scoring 39.4 to 36.3 on the Noometry Index.

- Canonical page: https://noometry.com/compare/grok-4-fast-vs-mistral-medium
- Last updated: 2026-10-11
- Shared benchmarks: 21

## Summary

- They share 21 benchmarks with published results for both. Grok 4 Fast scores higher in 5 categories and Mistral Medium in 4 categories; 6 gaps are clear of the uncertainty.
- The widest gap is in long context, where Grok 4 Fast leads 63.2 to 42.9.
- The biggest single-benchmark swing is Kagi LLM Benchmark: 66.1% for Grok 4 Fast and 50% for Mistral Medium.
- Mistral Medium has downloadable open weights; the other is API-only.

## Snapshot

| | Grok 4 Fast | Mistral Medium |
|---|---|---|
| Provider | xAI | Mistral AI |
| Noometry Index | 39.4 | 36.3 |
| Rank | 167 | 218 |
| Context | — | 262K |
| Input $/M | — | $1.50 |
| Output $/M | — | $7.50 |
| Weights | Proprietary | Open |

## Coding

- Grok 4 Fast: 32.5 (#271)
- Mistral Medium: 34.2 (#243)

| Benchmark | Grok 4 Fast | Mistral Medium |
|---|---|---|
| WeirdML | 42.9% | 43.7% |
| LMArena Coding | 1429 | 1434 |
| FrontierCode | — | 8% |
| LMArena WebDev | 1159 | — |
| SciCode | — | 40.2% |
| ALE-Bench | — | 763.98 |

## Agentic & Tool Use

- Grok 4 Fast: 29.5 (#86)
- Mistral Medium: 28.3 (#90)

| Benchmark | Grok 4 Fast | Mistral Medium |
|---|---|---|
| Berkeley Function Calling Leaderboard | — | 37.7% |
| τ²-bench Banking | 15.7% | — |
| Cybench | 30% | — |
| LMArena Search | 1171 | — |

## Reasoning

- Grok 4 Fast: 22.2 (#201)
- Mistral Medium: 24.0 (#167)

| Benchmark | Grok 4 Fast | Mistral Medium |
|---|---|---|
| Kagi LLM Benchmark | 66.1% | 50% |
| LMArena Hard Prompts | 1412 | 1426 |
| DTBench | 82.7% | 75.5% |
| ARC-AGI-2 | 5.3% | — |
| ARC-AGI-1 | 48.5% | — |
| CritPt | — | 0% |
| LMCA | — | 26.1% |
| Surface Evolver Bench | — | 26.9% |
| Epoch Capabilities Index | 144.2 | — |
| ForecastBench | 60.5 | — |

## Math

- Grok 4 Fast: 38.9 (#123)
- Mistral Medium: 28.1 (#245)

| Benchmark | Grok 4 Fast | Mistral Medium |
|---|---|---|
| LMArena Math | 1419 | 1408 |
| OTIS Mock AIME 2024-2025 | — | 32.2% |
| ProofBench | — | 9% |
| MATH Level 5 | — | 81.6% |
| FrontierMath (Feb 2025 set) | — | 0.3% |

## Knowledge

- Grok 4 Fast: 32.0 (#214)
- Mistral Medium: 25.0 (#265)

| Benchmark | Grok 4 Fast | Mistral Medium |
|---|---|---|
| Vectara Hallucination Rate | 19.7% | 22.7% |
| LMArena Expert | 1411 | 1408 |
| GPQA Diamond | — | 59.5% |
| Humanity's Last Exam | — | 4.5% |

## Multimodal

- Grok 4 Fast: —
- Mistral Medium: 35.3 (#88)

| Benchmark | Grok 4 Fast | Mistral Medium |
|---|---|---|
| LMArena Vision | — | 1172 |

## Multilingual

- Grok 4 Fast: 51.3 (#111)
- Mistral Medium: 52.1 (#91)

| Benchmark | Grok 4 Fast | Mistral Medium |
|---|---|---|
| LMArena Non-English | 1396 | 1408 |
| LMArena Chinese | 1457 | 1447 |
| LMArena French | 1431 | 1459 |
| LMArena German | 1383 | 1432 |
| LMArena Japanese | 1352 | 1378 |
| LMArena Korean | 1357 | 1380 |
| LMArena Russian | 1389 | 1411 |
| LMArena Spanish | 1415 | 1433 |

## Instruction Following

- Grok 4 Fast: 73.2 (#121)
- Mistral Medium: 73.7 (#116)

| Benchmark | Grok 4 Fast | Mistral Medium |
|---|---|---|
| LMArena Instruction Following | 1387 | 1398 |

## Long Context

- Grok 4 Fast: 63.2 (#3)
- Mistral Medium: 42.9 (#114)

| Benchmark | Grok 4 Fast | Mistral Medium |
|---|---|---|
| LMArena Longer Query | 1415 | 1406 |
| Fiction.LiveBench | 94.4% | — |

## Writing & Preference

- Grok 4 Fast: 60.0 (#102)
- Mistral Medium: 60.0 (#103)

| Benchmark | Grok 4 Fast | Mistral Medium |
|---|---|---|
| LMArena Text | 1407 | 1424 |
| LMArena Creative Writing | 1387 | 1391 |
| LMArena Multi-Turn | 1414 | 1418 |
| Short-Story Creative Writing | — | 77.3% |

## FAQ

### Is Grok 4 Fast better than Mistral Medium?

Grok 4 Fast is the stronger model overall, scoring 39.4 to 36.3 on the Noometry Index.

### Is Grok 4 Fast or Mistral Medium better for coding?

Mistral Medium scores higher on coding benchmarks: 34.2 versus 32.5 in the Noometry coding category.

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

21 benchmarks have published results for both models. Grok 4 Fast has 30 scored results on Noometry and Mistral Medium has 36.