# Grok 4.1 Fast vs Mistral Medium 3.5

> Grok 4.1 Fast is the stronger model overall, scoring 41.4 to 40.2 on the Noometry Index.

- Canonical page: https://noometry.com/compare/grok-4-1-fast-vs-mistral-medium-3-5
- Last updated: 2026-10-12
- Shared benchmarks: 19

## Summary

- They share 19 benchmarks with published results for both. Grok 4.1 Fast scores higher in 1 category and Mistral Medium 3.5 in 8 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Grok 4.1 Fast leads 43.4 to 17.3.
- The biggest single-benchmark swing is NYT Connections (extended): 87.4% for Grok 4.1 Fast and 12.9% for Mistral Medium 3.5.
- Grok 4.1 Fast is cheaper at $0.20 / $0.50 per million input/output tokens, against $1.50 / $7.50 for Mistral Medium 3.5.
- Mistral Medium 3.5 accepts more context: 262K tokens versus 128K.
- Mistral Medium 3.5 has downloadable open weights; the other is API-only.

## Snapshot

| | Grok 4.1 Fast | Mistral Medium 3.5 |
|---|---|---|
| Provider | xAI | Mistral AI |
| Noometry Index | 41.4 | 40.2 |
| Rank | 136 | 152 |
| Context | 128K | 262K |
| Input $/M | $0.20 | $1.50 |
| Output $/M | $0.50 | $7.50 |
| Weights | Proprietary | Open |

## Coding

- Grok 4.1 Fast: 34.1 (#245)
- Mistral Medium 3.5: 36.0 (#213)

| Benchmark | Grok 4.1 Fast | Mistral Medium 3.5 |
|---|---|---|
| LMArena WebDev | 1242 | 1264 |
| LMArena Coding | 1411 | 1461 |
| ALE-Bench | 394.93 | — |

## Agentic & Tool Use

- Grok 4.1 Fast: 36.3 (#39)
- Mistral Medium 3.5: —

| Benchmark | Grok 4.1 Fast | Mistral Medium 3.5 |
|---|---|---|
| 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 Medium 3.5: 17.3 (#295)

| Benchmark | Grok 4.1 Fast | Mistral Medium 3.5 |
|---|---|---|
| NYT Connections (extended) | 87.4% | 12.9% |
| LMArena Hard Prompts | 1407 | 1436 |
| SimpleBench | 56% | — |
| Kagi LLM Benchmark | — | 41.4% |
| DTBench | 87.7% | — |
| Epoch Capabilities Index | — | 141.35 |
| ForecastBench | 61 | — |

## Math

- Grok 4.1 Fast: 31.9 (#221)
- Mistral Medium 3.5: 39.1 (#113)

| Benchmark | Grok 4.1 Fast | Mistral Medium 3.5 |
|---|---|---|
| LMArena Math | 1408 | 1431 |
| MathArena Final-Answer Competitions | 60.9% | — |
| ProofBench | 4% | — |

## Knowledge

- Grok 4.1 Fast: 33.1 (#207)
- Mistral Medium 3.5: 40.0 (#126)

| Benchmark | Grok 4.1 Fast | Mistral Medium 3.5 |
|---|---|---|
| LMArena Expert | 1399 | 1432 |
| Vectara Hallucination Rate | 17.8% | — |

## Multimodal

- Grok 4.1 Fast: 37.0 (#76)
- Mistral Medium 3.5: 38.3 (#65)

| Benchmark | Grok 4.1 Fast | Mistral Medium 3.5 |
|---|---|---|
| LMArena Vision | 1201 | 1223 |

## Multilingual

- Grok 4.1 Fast: 51.0 (#114)
- Mistral Medium 3.5: 51.9 (#100)

| Benchmark | Grok 4.1 Fast | Mistral Medium 3.5 |
|---|---|---|
| LMArena Non-English | 1391 | 1404 |
| LMArena Chinese | 1441 | 1442 |
| LMArena French | 1415 | 1448 |
| LMArena German | 1404 | 1451 |
| LMArena Korean | 1361 | 1385 |
| LMArena Russian | 1387 | 1395 |
| LMArena Spanish | 1413 | 1409 |
| LMArena Japanese | 1349 | — |

## Instruction Following

- Grok 4.1 Fast: 72.7 (#133)
- Mistral Medium 3.5: 74.6 (#90)

| Benchmark | Grok 4.1 Fast | Mistral Medium 3.5 |
|---|---|---|
| LMArena Instruction Following | 1376 | 1415 |

## Long Context

- Grok 4.1 Fast: 42.4 (#126)
- Mistral Medium 3.5: 43.2 (#103)

| Benchmark | Grok 4.1 Fast | Mistral Medium 3.5 |
|---|---|---|
| LMArena Longer Query | 1390 | 1415 |

## Writing & Preference

- Grok 4.1 Fast: 57.2 (#131)
- Mistral Medium 3.5: 58.5 (#117)

| Benchmark | Grok 4.1 Fast | Mistral Medium 3.5 |
|---|---|---|
| LMArena Text | 1408 | 1421 |
| LMArena Creative Writing | 1394 | 1374 |
| LMArena Multi-Turn | 1389 | 1423 |
| EQ-Bench Creative Writing | 1327 | — |
| EQ-Bench 4 | — | 993 |

## FAQ

### Is Grok 4.1 Fast better than Mistral Medium 3.5?

Grok 4.1 Fast is the stronger model overall, scoring 41.4 to 40.2 on the Noometry Index.

### Which is cheaper, Grok 4.1 Fast or Mistral Medium 3.5?

Grok 4.1 Fast is cheaper. It lists at $0.20 per million input tokens and $0.50 per million output tokens; Mistral Medium 3.5 lists at $1.50 and $7.50.

### Is Grok 4.1 Fast or Mistral Medium 3.5 better for coding?

Mistral Medium 3.5 scores higher on coding benchmarks: 36.0 versus 34.1 in the Noometry coding category.

### Which has the bigger context window?

Mistral Medium 3.5 does, with 262K tokens against 128K.

### How many benchmarks do Grok 4.1 Fast and Mistral Medium 3.5 share?

19 benchmarks have published results for both models. Grok 4.1 Fast has 32 scored results on Noometry and Mistral Medium 3.5 has 22.