# Grok 4 Fast vs MiMo-V2-Omni

> MiMo-V2-Omni is the stronger model overall, scoring 42.9 to 39.0 on the Noometry Index.

- Canonical page: https://noometry.com/compare/grok-4-fast-vs-mimo-v2-omni
- Last updated: 2026-10-10
- Shared benchmarks: 17

## Summary

- They share 17 benchmarks with published results for both. Grok 4 Fast scores higher in 1 category and MiMo-V2-Omni in 7 categories; 6 gaps are clear of the uncertainty.
- The widest gap is in long context, where Grok 4 Fast leads 63.2 to 44.1.

## Snapshot

| | Grok 4 Fast | MiMo-V2-Omni |
|---|---|---|
| Provider | xAI | Xiaomi |
| Noometry Index | 39.0 | 42.9 |
| Rank | 164 | 91 |
| Context | — | 262K |
| Input $/M | — | $0.14 |
| Output $/M | — | $0.28 |
| Weights | Proprietary | Proprietary |

## Coding

- Grok 4 Fast: 32.3 (#264)
- MiMo-V2-Omni: 42.7 (#87)

| Benchmark | Grok 4 Fast | MiMo-V2-Omni |
|---|---|---|
| LMArena Coding | 1429 | 1467 |
| LMArena WebDev | 1160 | — |
| WeirdML | 42.9% | — |

## Agentic & Tool Use

- Grok 4 Fast: 29.3 (#80)
- MiMo-V2-Omni: —

| Benchmark | Grok 4 Fast | MiMo-V2-Omni |
|---|---|---|
| τ²-bench Banking | 15.7% | — |
| Cybench | 30% | — |
| LMArena Search | 1171 | — |

## Reasoning

- Grok 4 Fast: 22.5 (#179)
- MiMo-V2-Omni: 28.6 (#86)

| Benchmark | Grok 4 Fast | MiMo-V2-Omni |
|---|---|---|
| LMArena Hard Prompts | 1413 | 1445 |
| ARC-AGI-2 | 5.3% | — |
| Kagi LLM Benchmark | 66.1% | — |
| ARC-AGI-1 | 48.5% | — |
| DTBench | 82.7% | — |
| Epoch Capabilities Index | 144.21 | — |
| ForecastBench | 60.5 | — |

## Math

- Grok 4 Fast: 36.1 (#126)
- MiMo-V2-Omni: 36.4 (#112)

| Benchmark | Grok 4 Fast | MiMo-V2-Omni |
|---|---|---|
| LMArena Math | 1419 | 1432 |

## Knowledge

- Grok 4 Fast: 31.5 (#211)
- MiMo-V2-Omni: 39.9 (#114)

| Benchmark | Grok 4 Fast | MiMo-V2-Omni |
|---|---|---|
| LMArena Expert | 1411 | 1449 |
| Vectara Hallucination Rate | 19.7% | — |

## Multimodal

- Grok 4 Fast: —
- MiMo-V2-Omni: 37.9 (#62)

| Benchmark | Grok 4 Fast | MiMo-V2-Omni |
|---|---|---|
| LMArena Vision | — | 1228 |

## Multilingual

- Grok 4 Fast: 51.5 (#106)
- MiMo-V2-Omni: 52.0 (#97)

| Benchmark | Grok 4 Fast | MiMo-V2-Omni |
|---|---|---|
| LMArena Non-English | 1397 | 1404 |
| LMArena Chinese | 1458 | 1469 |
| LMArena French | 1433 | 1448 |
| LMArena German | 1383 | 1398 |
| LMArena Japanese | 1358 | 1318 |
| LMArena Korean | 1359 | 1355 |
| LMArena Russian | 1387 | 1412 |
| LMArena Spanish | 1414 | 1432 |

## Instruction Following

- Grok 4 Fast: 73.4 (#116)
- MiMo-V2-Omni: 75.4 (#62)

| Benchmark | Grok 4 Fast | MiMo-V2-Omni |
|---|---|---|
| LMArena Instruction Following | 1388 | 1428 |

## Long Context

- Grok 4 Fast: 63.2 (#3)
- MiMo-V2-Omni: 44.1 (#72)

| Benchmark | Grok 4 Fast | MiMo-V2-Omni |
|---|---|---|
| LMArena Longer Query | 1415 | 1442 |
| Fiction.LiveBench | 94.4% | — |

## Writing & Preference

- Grok 4 Fast: 60.2 (#96)
- MiMo-V2-Omni: 61.6 (#83)

| Benchmark | Grok 4 Fast | MiMo-V2-Omni |
|---|---|---|
| LMArena Text | 1407 | 1424 |
| LMArena Creative Writing | 1388 | 1393 |
| LMArena Multi-Turn | 1414 | 1446 |

## FAQ

### Is Grok 4 Fast better than MiMo-V2-Omni?

MiMo-V2-Omni is the stronger model overall, scoring 42.9 to 39.0 on the Noometry Index.

### Is Grok 4 Fast or MiMo-V2-Omni better for coding?

MiMo-V2-Omni scores higher on coding benchmarks: 42.7 versus 32.3 in the Noometry coding category.

### How many benchmarks do Grok 4 Fast and MiMo-V2-Omni share?

17 benchmarks have published results for both models. Grok 4 Fast has 30 scored results on Noometry and MiMo-V2-Omni has 18.