# Grok 4.1 Fast vs Hy3

> Hy3 is the stronger model overall, scoring 44.2 to 41.4 on the Noometry Index.

- Canonical page: https://noometry.com/compare/grok-4-1-fast-vs-hy3
- 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 1 category and Hy3 in 7 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Grok 4.1 Fast leads 43.4 to 26.1.
- The biggest single-benchmark swing is NYT Connections (extended): 87.4% for Grok 4.1 Fast and 41.2% for Hy3.
- Hy3 is cheaper at $0.0825 / $0.33 per million input/output tokens, against $0.20 / $0.50 for Grok 4.1 Fast.
- Hy3 accepts more context: 262K tokens versus 128K.
- Hy3 has downloadable open weights; the other is API-only.

## Snapshot

| | Grok 4.1 Fast | Hy3 |
|---|---|---|
| Provider | xAI | Tencent |
| Noometry Index | 41.4 | 44.2 |
| Rank | 136 | 79 |
| Context | 128K | 262K |
| Input $/M | $0.20 | $0.0825 |
| Output $/M | $0.50 | $0.33 |
| Weights | Proprietary | Open |

## Coding

- Grok 4.1 Fast: 34.1 (#245)
- Hy3: 46.8 (#63)

| Benchmark | Grok 4.1 Fast | Hy3 |
|---|---|---|
| LMArena WebDev | 1242 | 1508 |
| LMArena Coding | 1411 | 1464 |
| ALE-Bench | 394.93 | — |

## Agentic & Tool Use

- Grok 4.1 Fast: 36.3 (#39)
- Hy3: —

| Benchmark | Grok 4.1 Fast | Hy3 |
|---|---|---|
| Berkeley Function Calling Leaderboard | 69.6% | — |
| τ²-bench Banking | 13.1% | — |
| LMArena Search | 1171 | — |
| Vending-Bench 2 | 1,107 | — |

## Reasoning

- Grok 4.1 Fast: 43.4 (#49)
- Hy3: 26.1 (#136)

| Benchmark | Grok 4.1 Fast | Hy3 |
|---|---|---|
| NYT Connections (extended) | 87.4% | 41.2% |
| LMArena Hard Prompts | 1407 | 1447 |
| SimpleBench | 56% | — |
| DTBench | 87.7% | — |
| ForecastBench | 61 | — |

## Math

- Grok 4.1 Fast: 31.9 (#221)
- Hy3: 40.1 (#93)

| Benchmark | Grok 4.1 Fast | Hy3 |
|---|---|---|
| LMArena Math | 1408 | 1475 |
| MathArena Final-Answer Competitions | 60.9% | — |
| ProofBench | 4% | — |

## Knowledge

- Grok 4.1 Fast: 33.1 (#207)
- Hy3: 40.8 (#114)

| Benchmark | Grok 4.1 Fast | Hy3 |
|---|---|---|
| LMArena Expert | 1399 | 1460 |
| Vectara Hallucination Rate | 17.8% | — |

## Multimodal

- Grok 4.1 Fast: 37.0 (#76)
- Hy3: —

| Benchmark | Grok 4.1 Fast | Hy3 |
|---|---|---|
| LMArena Vision | 1201 | — |

## Multilingual

- Grok 4.1 Fast: 51.0 (#114)
- Hy3: 53.5 (#65)

| Benchmark | Grok 4.1 Fast | Hy3 |
|---|---|---|
| LMArena Non-English | 1391 | 1426 |
| LMArena Chinese | 1441 | 1493 |
| LMArena French | 1415 | 1461 |
| LMArena German | 1404 | 1439 |
| LMArena Japanese | 1349 | 1392 |
| LMArena Korean | 1361 | 1395 |
| LMArena Russian | 1387 | 1432 |
| LMArena Spanish | 1413 | 1456 |

## Instruction Following

- Grok 4.1 Fast: 72.7 (#133)
- Hy3: 75.1 (#70)

| Benchmark | Grok 4.1 Fast | Hy3 |
|---|---|---|
| LMArena Instruction Following | 1376 | 1426 |

## Long Context

- Grok 4.1 Fast: 42.4 (#126)
- Hy3: 44.1 (#75)

| Benchmark | Grok 4.1 Fast | Hy3 |
|---|---|---|
| LMArena Longer Query | 1390 | 1442 |

## Writing & Preference

- Grok 4.1 Fast: 57.2 (#131)
- Hy3: 62.2 (#81)

| Benchmark | Grok 4.1 Fast | Hy3 |
|---|---|---|
| LMArena Text | 1408 | 1439 |
| LMArena Creative Writing | 1394 | 1402 |
| LMArena Multi-Turn | 1389 | 1436 |
| EQ-Bench Creative Writing | 1327 | — |

## FAQ

### Is Grok 4.1 Fast better than Hy3?

Hy3 is the stronger model overall, scoring 44.2 to 41.4 on the Noometry Index.

### Which is cheaper, Grok 4.1 Fast or Hy3?

Hy3 is cheaper. It lists at $0.0825 per million input tokens and $0.33 per million output tokens; Grok 4.1 Fast lists at $0.20 and $0.50.

### Is Grok 4.1 Fast or Hy3 better for coding?

Hy3 scores higher on coding benchmarks: 46.8 versus 34.1 in the Noometry coding category.

### Which has the bigger context window?

Hy3 does, with 262K tokens against 128K.

### How many benchmarks do Grok 4.1 Fast and Hy3 share?

19 benchmarks have published results for both models. Grok 4.1 Fast has 32 scored results on Noometry and Hy3 has 19.