# Grok 4 Fast vs Hy3

> Hy3 is the stronger model overall, scoring 43.6 to 39.0 on the Noometry Index.

- Canonical page: https://noometry.com/compare/grok-4-fast-vs-hy3
- Last updated: 2026-10-10
- Shared benchmarks: 16

## Summary

- They share 16 benchmarks with published results for both. Grok 4 Fast scores higher in 1 category and Hy3 in 7 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in long context, where Grok 4 Fast leads 63.2 to 44.1.
- Hy3 has downloadable open weights; the other is API-only.

## Snapshot

| | Grok 4 Fast | Hy3 |
|---|---|---|
| Provider | xAI | Tencent |
| Noometry Index | 39.0 | 43.6 |
| Rank | 164 | 79 |
| Context | — | 262K |
| Input $/M | — | $0.13 |
| Output $/M | — | $0.53 |
| Weights | Proprietary | Open |

## Coding

- Grok 4 Fast: 32.3 (#264)
- Hy3: 46.6 (#60)

| Benchmark | Grok 4 Fast | Hy3 |
|---|---|---|
| LMArena WebDev | 1160 | 1509 |
| LMArena Coding | 1429 | 1465 |
| WeirdML | 42.9% | — |

## Agentic & Tool Use

- Grok 4 Fast: 29.3 (#80)
- Hy3: —

| Benchmark | Grok 4 Fast | Hy3 |
|---|---|---|
| τ²-bench Banking | 15.7% | — |
| Cybench | 30% | — |
| LMArena Search | 1171 | — |

## Reasoning

- Grok 4 Fast: 22.5 (#179)
- Hy3: 25.0 (#134)

| Benchmark | Grok 4 Fast | Hy3 |
|---|---|---|
| LMArena Hard Prompts | 1413 | 1449 |
| ARC-AGI-2 | 5.3% | — |
| Kagi LLM Benchmark | 66.1% | — |
| NYT Connections (extended) | — | 41.2% |
| ARC-AGI-1 | 48.5% | — |
| DTBench | 82.7% | — |
| Epoch Capabilities Index | 144.21 | — |
| ForecastBench | 60.5 | — |

## Math

- Grok 4 Fast: 36.1 (#126)
- Hy3: 37.4 (#98)

| Benchmark | Grok 4 Fast | Hy3 |
|---|---|---|
| LMArena Math | 1419 | 1475 |

## Knowledge

- Grok 4 Fast: 31.5 (#211)
- Hy3: 40.2 (#108)

| Benchmark | Grok 4 Fast | Hy3 |
|---|---|---|
| LMArena Expert | 1411 | 1461 |
| Vectara Hallucination Rate | 19.7% | — |

## Multilingual

- Grok 4 Fast: 51.5 (#106)
- Hy3: 53.7 (#60)

| Benchmark | Grok 4 Fast | Hy3 |
|---|---|---|
| LMArena Non-English | 1397 | 1427 |
| LMArena Chinese | 1458 | 1496 |
| LMArena French | 1433 | 1461 |
| LMArena Korean | 1359 | 1390 |
| LMArena Russian | 1387 | 1435 |
| LMArena Spanish | 1414 | 1448 |
| LMArena German | 1383 | — |
| LMArena Japanese | 1358 | — |

## Instruction Following

- Grok 4 Fast: 73.4 (#116)
- Hy3: 75.3 (#68)

| Benchmark | Grok 4 Fast | Hy3 |
|---|---|---|
| LMArena Instruction Following | 1388 | 1425 |

## Long Context

- Grok 4 Fast: 63.2 (#3)
- Hy3: 44.1 (#70)

| Benchmark | Grok 4 Fast | Hy3 |
|---|---|---|
| LMArena Longer Query | 1415 | 1443 |
| Fiction.LiveBench | 94.4% | — |

## Writing & Preference

- Grok 4 Fast: 60.2 (#96)
- Hy3: 62.5 (#75)

| Benchmark | Grok 4 Fast | Hy3 |
|---|---|---|
| LMArena Text | 1407 | 1442 |
| LMArena Creative Writing | 1388 | 1399 |
| LMArena Multi-Turn | 1414 | 1436 |

## FAQ

### Is Grok 4 Fast better than Hy3?

Hy3 is the stronger model overall, scoring 43.6 to 39.0 on the Noometry Index.

### Is Grok 4 Fast or Hy3 better for coding?

Hy3 scores higher on coding benchmarks: 46.6 versus 32.3 in the Noometry coding category.

### How many benchmarks do Grok 4 Fast and Hy3 share?

16 benchmarks have published results for both models. Grok 4 Fast has 30 scored results on Noometry and Hy3 has 17.