# Grok 4 Fast vs MiMo-V2-Pro

> MiMo-V2-Pro is the stronger model overall, scoring 42.4 to 39.0 on the Noometry Index.

- Canonical page: https://noometry.com/compare/grok-4-fast-vs-mimo-v2-pro
- Last updated: 2026-10-10
- Shared benchmarks: 18

## Summary

- They share 18 benchmarks with published results for both. Grok 4 Fast scores higher in 2 categories and MiMo-V2-Pro in 6 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in long context, where Grok 4 Fast leads 63.2 to 41.5.

## Snapshot

| | Grok 4 Fast | MiMo-V2-Pro |
|---|---|---|
| Provider | xAI | Xiaomi |
| Noometry Index | 39.0 | 42.4 |
| Rank | 164 | 102 |
| Context | — | 1.05M |
| Input $/M | — | $0.43 |
| Output $/M | — | $0.87 |
| Weights | Proprietary | Proprietary |

## Coding

- Grok 4 Fast: 32.3 (#264)
- MiMo-V2-Pro: 43.4 (#76)

| Benchmark | Grok 4 Fast | MiMo-V2-Pro |
|---|---|---|
| LMArena WebDev | 1160 | 1433 |
| LMArena Coding | 1429 | 1476 |
| WeirdML | 42.9% | — |
| ALE-Bench | — | 785.17 |

## Agentic & Tool Use

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

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

## Reasoning

- Grok 4 Fast: 22.5 (#179)
- MiMo-V2-Pro: 21.3 (#200)

| Benchmark | Grok 4 Fast | MiMo-V2-Pro |
|---|---|---|
| LMArena Hard Prompts | 1413 | 1457 |
| ARC-AGI-2 | 5.3% | — |
| Kagi LLM Benchmark | 66.1% | — |
| NYT Connections (extended) | — | 25.8% |
| ARC-AGI-1 | 48.5% | — |
| Thematic Generalization | — | 45.9% |
| DTBench | 82.7% | — |
| Epoch Capabilities Index | 144.21 | — |
| ForecastBench | 60.5 | — |

## Math

- Grok 4 Fast: 36.1 (#126)
- MiMo-V2-Pro: 36.7 (#104)

| Benchmark | Grok 4 Fast | MiMo-V2-Pro |
|---|---|---|
| LMArena Math | 1419 | 1447 |

## Knowledge

- Grok 4 Fast: 31.5 (#211)
- MiMo-V2-Pro: 40.8 (#106)

| Benchmark | Grok 4 Fast | MiMo-V2-Pro |
|---|---|---|
| LMArena Expert | 1411 | 1479 |
| Vectara Hallucination Rate | 19.7% | — |

## Multilingual

- Grok 4 Fast: 51.5 (#106)
- MiMo-V2-Pro: 52.9 (#77)

| Benchmark | Grok 4 Fast | MiMo-V2-Pro |
|---|---|---|
| LMArena Non-English | 1397 | 1416 |
| LMArena Chinese | 1458 | 1455 |
| LMArena French | 1433 | 1470 |
| LMArena German | 1383 | 1417 |
| LMArena Japanese | 1358 | 1366 |
| LMArena Korean | 1359 | 1401 |
| LMArena Russian | 1387 | 1427 |
| LMArena Spanish | 1414 | 1458 |

## Instruction Following

- Grok 4 Fast: 73.4 (#116)
- MiMo-V2-Pro: 76.2 (#46)

| Benchmark | Grok 4 Fast | MiMo-V2-Pro |
|---|---|---|
| LMArena Instruction Following | 1388 | 1444 |

## Long Context

- Grok 4 Fast: 63.2 (#3)
- MiMo-V2-Pro: 41.5 (#133)

| Benchmark | Grok 4 Fast | MiMo-V2-Pro |
|---|---|---|
| LMArena Longer Query | 1415 | 1455 |
| Fiction.LiveBench | 94.4% | — |
| CL-bench | — | 15.7% |
| CL-bench Life | — | 6.9% |

## Writing & Preference

- Grok 4 Fast: 60.2 (#96)
- MiMo-V2-Pro: 62.9 (#67)

| Benchmark | Grok 4 Fast | MiMo-V2-Pro |
|---|---|---|
| LMArena Text | 1407 | 1436 |
| LMArena Creative Writing | 1388 | 1415 |
| LMArena Multi-Turn | 1414 | 1456 |

## FAQ

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

MiMo-V2-Pro is the stronger model overall, scoring 42.4 to 39.0 on the Noometry Index.

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

MiMo-V2-Pro scores higher on coding benchmarks: 43.4 versus 32.3 in the Noometry coding category.

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

18 benchmarks have published results for both models. Grok 4 Fast has 30 scored results on Noometry and MiMo-V2-Pro has 23.