# Grok 4.1 Fast vs Mixtral 8x7B

> Grok 4.1 Fast is the stronger model overall, scoring 40.9 to 26.8 on the Noometry Index.

- Canonical page: https://noometry.com/compare/grok-4-1-fast-vs-mixtral-8x7b
- Last updated: 2026-10-10
- Shared benchmarks: 19

## Summary

- They share 19 benchmarks with published results for both. Grok 4.1 Fast scores higher in 8 categories and Mixtral 8x7B in 0 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Grok 4.1 Fast leads 42.3 to 17.4.
- The biggest single-benchmark swing is DTBench: 87.7% for Grok 4.1 Fast and 49.6% for Mixtral 8x7B.
- Grok 4.1 Fast is cheaper at $0.20 / $0.50 per million input/output tokens, against $0.70 / $0.70 for Mixtral 8x7B.
- Grok 4.1 Fast accepts more context: 128K tokens versus 32K.
- Mixtral 8x7B has downloadable open weights; the other is API-only.

## Snapshot

| | Grok 4.1 Fast | Mixtral 8x7B |
|---|---|---|
| Provider | xAI | Mistral AI |
| Noometry Index | 40.9 | 26.8 |
| Rank | 131 | 328 |
| Context | 128K | 32K |
| Input $/M | $0.20 | $0.70 |
| Output $/M | $0.50 | $0.70 |
| Weights | Proprietary | Open |

## Coding

- Grok 4.1 Fast: 33.8 (#236)
- Mixtral 8x7B: 32.2 (#265)

| Benchmark | Grok 4.1 Fast | Mixtral 8x7B |
|---|---|---|
| LMArena Coding | 1411 | 1127 |
| LMArena WebDev | 1241 | — |
| ALE-Bench | 394.93 | — |
| HumanEval+ | — | 39.6% |
| MBPP+ | — | 49.7% |

## Agentic & Tool Use

- Grok 4.1 Fast: 36.1 (#35)
- Mixtral 8x7B: —

| Benchmark | Grok 4.1 Fast | Mixtral 8x7B |
|---|---|---|
| Berkeley Function Calling Leaderboard | 69.6% | — |
| τ²-bench Banking | 13.1% | — |
| LMArena Search | 1171 | — |
| Vending-Bench 2 | 1,107 | — |

## Reasoning

- Grok 4.1 Fast: 42.3 (#45)
- Mixtral 8x7B: 17.4 (#283)

| Benchmark | Grok 4.1 Fast | Mixtral 8x7B |
|---|---|---|
| LMArena Hard Prompts | 1407 | 1115 |
| DTBench | 87.7% | 49.6% |
| ForecastBench | 61 | 56.3 |
| SimpleBench | 56% | — |
| NYT Connections (extended) | 87.4% | — |
| Adversarial NLI | — | 55.2% |
| Epoch Capabilities Index | — | 118.38 |
| HellaSwag | — | 86.7% |
| PIQA | — | 83.6% |
| WinoGrande | — | 77.2% |

## Math

- Grok 4.1 Fast: 30.9 (#201)
- Mixtral 8x7B: 17.2 (#284)

| Benchmark | Grok 4.1 Fast | Mixtral 8x7B |
|---|---|---|
| LMArena Math | 1408 | 1147 |
| MathArena Final-Answer Competitions | 60.9% | — |
| ProofBench | 4% | — |
| Omni-MATH | — | 10.5% |
| MATH Level 5 | — | 10% |
| GSM8K | — | 74.4% |

## Knowledge

- Grok 4.1 Fast: 32.6 (#203)
- Mixtral 8x7B: 11.0 (#296)

| Benchmark | Grok 4.1 Fast | Mixtral 8x7B |
|---|---|---|
| LMArena Expert | 1398 | 1088 |
| GPQA Diamond | — | 30.6% |
| MMLU-Pro | — | 33.5% |
| Vectara Hallucination Rate | 17.8% | — |
| GPQA (HELM) | — | 29.6% |
| ARC (AI2) Challenge | — | 87.3% |
| MMLU | — | 70.6% |
| OpenBookQA | — | 85.8% |
| TriviaQA | — | 82.2% |

## Multimodal

- Grok 4.1 Fast: 36.3 (#71)
- Mixtral 8x7B: —

| Benchmark | Grok 4.1 Fast | Mixtral 8x7B |
|---|---|---|
| LMArena Vision | 1201 | — |

## Multilingual

- Grok 4.1 Fast: 51.1 (#110)
- Mixtral 8x7B: 29.8 (#261)

| Benchmark | Grok 4.1 Fast | Mixtral 8x7B |
|---|---|---|
| LMArena Non-English | 1391 | 1077 |
| LMArena Chinese | 1441 | 1055 |
| LMArena French | 1416 | 1165 |
| LMArena German | 1404 | 1114 |
| LMArena Japanese | 1347 | 931 |
| LMArena Korean | 1361 | 968 |
| LMArena Russian | 1387 | 1090 |
| LMArena Spanish | 1411 | 1110 |

## Instruction Following

- Grok 4.1 Fast: 72.8 (#127)
- Mixtral 8x7B: 51.2 (#292)

| Benchmark | Grok 4.1 Fast | Mixtral 8x7B |
|---|---|---|
| LMArena Instruction Following | 1376 | 1110 |
| IFEval | — | 57.5% |

## Long Context

- Grok 4.1 Fast: 42.4 (#121)
- Mixtral 8x7B: 33.4 (#255)

| Benchmark | Grok 4.1 Fast | Mixtral 8x7B |
|---|---|---|
| LMArena Longer Query | 1390 | 1103 |

## Writing & Preference

- Grok 4.1 Fast: 57.4 (#126)
- Mixtral 8x7B: 34.4 (#265)

| Benchmark | Grok 4.1 Fast | Mixtral 8x7B |
|---|---|---|
| LMArena Text | 1408 | 1132 |
| LMArena Creative Writing | 1394 | 1109 |
| LMArena Multi-Turn | 1389 | 1115 |
| EQ-Bench Creative Writing | 1327 | — |
| WildBench | — | 67.3% |

## FAQ

### Is Grok 4.1 Fast better than Mixtral 8x7B?

Grok 4.1 Fast is the stronger model overall, scoring 40.9 to 26.8 on the Noometry Index.

### Which is cheaper, Grok 4.1 Fast or Mixtral 8x7B?

Grok 4.1 Fast is cheaper. It lists at $0.20 per million input tokens and $0.50 per million output tokens; Mixtral 8x7B lists at $0.70 and $0.70.

### Is Grok 4.1 Fast or Mixtral 8x7B better for coding?

Grok 4.1 Fast scores higher on coding benchmarks: 33.8 versus 32.2 in the Noometry coding category.

### Which has the bigger context window?

Grok 4.1 Fast does, with 128K tokens against 32K.

### How many benchmarks do Grok 4.1 Fast and Mixtral 8x7B share?

19 benchmarks have published results for both models. Grok 4.1 Fast has 32 scored results on Noometry and Mixtral 8x7B has 38.