# Grok 4.20 (Non-Reasoning) vs MiMo-V2.6-Flash

> Grok 4.20 (Non-Reasoning) and MiMo-V2.6-Flash score almost the same on the Noometry Index (48.6 vs 48.5), so choose on price, context window or the category you care about most.

- Canonical page: https://noometry.com/compare/grok-4-20-vs-mimo-v2-6-flash
- Last updated: 2026-10-10
- Shared benchmarks: 17

## Summary

- They share 17 benchmarks with published results for both. Grok 4.20 (Non-Reasoning) scores higher in 5 categories and MiMo-V2.6-Flash in 4 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Grok 4.20 (Non-Reasoning) leads 52.3 to 36.5.
- The biggest single-benchmark swing is ProofBench: 14% for Grok 4.20 (Non-Reasoning) and 63% for MiMo-V2.6-Flash.
- MiMo-V2.6-Flash is cheaper at $0.14 / $0.28 per million input/output tokens, against $1.25 / $2.50 for Grok 4.20 (Non-Reasoning).
- MiMo-V2.6-Flash accepts more context: 1.05M tokens versus 1M.
- MiMo-V2.6-Flash has downloadable open weights; the other is API-only.

## Snapshot

| | Grok 4.20 (Non-Reasoning) | MiMo-V2.6-Flash |
|---|---|---|
| Provider | xAI | Xiaomi |
| Noometry Index | 48.6 | 48.5 |
| Rank | 54 | 55 |
| Context | 1M | 1.05M |
| Input $/M | $1.25 | $0.14 |
| Output $/M | $2.50 | $0.28 |
| Weights | Proprietary | Open |

## Coding

- Grok 4.20 (Non-Reasoning): 42.1 (#112)
- MiMo-V2.6-Flash: 53.4 (#30)

| Benchmark | Grok 4.20 (Non-Reasoning) | MiMo-V2.6-Flash |
|---|---|---|
| LMArena WebDev | 1375 | 1637 |
| LMArena Coding | 1459 | 1504 |
| SciCode | — | 51.3% |
| WeirdML | 52.3% | — |
| ALE-Bench | 1,150 | — |

## Agentic & Tool Use

- Grok 4.20 (Non-Reasoning): 34.4 (#46)
- MiMo-V2.6-Flash: —

| Benchmark | Grok 4.20 (Non-Reasoning) | MiMo-V2.6-Flash |
|---|---|---|
| Terminal-Bench | 57.3% | — |
| τ²-bench Banking | 18% | — |
| LMArena Search | 1189 | — |
| Vending-Bench 2 | 4,663 | — |

## Reasoning

- Grok 4.20 (Non-Reasoning): 52.3 (#32)
- MiMo-V2.6-Flash: 36.5 (#66)

| Benchmark | Grok 4.20 (Non-Reasoning) | MiMo-V2.6-Flash |
|---|---|---|
| LMArena Hard Prompts | 1451 | 1482 |
| ARC-AGI-2 | 65.1% | — |
| Kagi LLM Benchmark | 75% | — |
| NYT Connections (extended) | 85.4% | — |
| ARC-AGI-1 | 89.5% | — |
| CritPt | — | 12% |
| Chess Puzzles | 24% | — |
| Thematic Generalization | 63.8% | — |
| DTBench | 90.1% | — |
| LMCA | 38.7% | — |
| Epoch Capabilities Index | 151.98 | — |
| ForecastBench | 61.4 | — |

## Math

- Grok 4.20 (Non-Reasoning): 48.2 (#65)
- MiMo-V2.6-Flash: 51.9 (#52)

| Benchmark | Grok 4.20 (Non-Reasoning) | MiMo-V2.6-Flash |
|---|---|---|
| ProofBench | 14% | 63% |
| LMArena Math | 1455 | 1468 |
| FrontierMath (Tiers 1-3) | 44.9% | — |
| FrontierMath Tier 4 | 17.1% | — |
| OTIS Mock AIME 2024-2025 | 92.2% | — |

## Knowledge

- Grok 4.20 (Non-Reasoning): 52.8 (#60)
- MiMo-V2.6-Flash: 42.2 (#99)

| Benchmark | Grok 4.20 (Non-Reasoning) | MiMo-V2.6-Flash |
|---|---|---|
| LMArena Expert | 1439 | 1501 |
| GPQA Diamond | 89.3% | — |
| SimpleQA Verified | 30.2% | — |

## Multimodal

- Grok 4.20 (Non-Reasoning): 33.3 (#98)
- MiMo-V2.6-Flash: 40.5 (#47)

| Benchmark | Grok 4.20 (Non-Reasoning) | MiMo-V2.6-Flash |
|---|---|---|
| LMArena Vision | 1263 | 1259 |
| Blueprint-Bench 2 | 0% | — |
| LMArena Document | 1416 | — |

## Multilingual

- Grok 4.20 (Non-Reasoning): 54.5 (#40)
- MiMo-V2.6-Flash: 54.0 (#51)

| Benchmark | Grok 4.20 (Non-Reasoning) | MiMo-V2.6-Flash |
|---|---|---|
| LMArena Non-English | 1441 | 1434 |
| LMArena Chinese | 1481 | 1511 |
| LMArena French | 1476 | 1475 |
| LMArena Russian | 1458 | 1409 |
| LMArena Spanish | 1443 | 1456 |
| LMArena German | 1465 | — |
| LMArena Japanese | 1449 | — |
| LMArena Korean | 1417 | — |

## Instruction Following

- Grok 4.20 (Non-Reasoning): 74.8 (#83)
- MiMo-V2.6-Flash: 76.8 (#35)

| Benchmark | Grok 4.20 (Non-Reasoning) | MiMo-V2.6-Flash |
|---|---|---|
| LMArena Instruction Following | 1420 | 1463 |

## Long Context

- Grok 4.20 (Non-Reasoning): 45.5 (#34)
- MiMo-V2.6-Flash: 44.8 (#57)

| Benchmark | Grok 4.20 (Non-Reasoning) | MiMo-V2.6-Flash |
|---|---|---|
| LMArena Longer Query | 1437 | 1463 |
| CL-bench | 22.2% | — |
| CL-bench Life | 11.9% | — |

## Writing & Preference

- Grok 4.20 (Non-Reasoning): 65.7 (#44)
- MiMo-V2.6-Flash: 63.1 (#67)

| Benchmark | Grok 4.20 (Non-Reasoning) | MiMo-V2.6-Flash |
|---|---|---|
| LMArena Text | 1451 | 1455 |
| LMArena Creative Writing | 1438 | 1400 |
| LMArena Multi-Turn | 1456 | 1451 |
| EQ-Bench Creative Writing | 1574 | — |

## FAQ

### Is Grok 4.20 (Non-Reasoning) better than MiMo-V2.6-Flash?

Grok 4.20 (Non-Reasoning) and MiMo-V2.6-Flash score almost the same on the Noometry Index (48.6 vs 48.5), so choose on price, context window or the category you care about most.

### Which is cheaper, Grok 4.20 (Non-Reasoning) or MiMo-V2.6-Flash?

MiMo-V2.6-Flash is cheaper. It lists at $0.14 per million input tokens and $0.28 per million output tokens; Grok 4.20 (Non-Reasoning) lists at $1.25 and $2.50.

### Is Grok 4.20 (Non-Reasoning) or MiMo-V2.6-Flash better for coding?

MiMo-V2.6-Flash scores higher on coding benchmarks: 53.4 versus 42.1 in the Noometry coding category.

### Which has the bigger context window?

MiMo-V2.6-Flash does, with 1.05M tokens against 1M.

### How many benchmarks do Grok 4.20 (Non-Reasoning) and MiMo-V2.6-Flash share?

17 benchmarks have published results for both models. Grok 4.20 (Non-Reasoning) has 46 scored results on Noometry and MiMo-V2.6-Flash has 19.