# Hy4 preview vs Yi-Lightning

> Hy4 preview is the stronger model overall, scoring 45.3 to 37.1 on the Noometry Index.

- Canonical page: https://noometry.com/compare/hy4-preview-vs-yi-lightning
- Last updated: 2026-10-11
- Shared benchmarks: 0

## Summary

- The widest gap is in coding, where Hy4 preview leads 51.6 to 27.4.
- Hy4 preview has downloadable open weights; the other is API-only.

## Snapshot

| | Hy4 preview | Yi-Lightning |
|---|---|---|
| Provider | Tencent | 01.AI |
| Noometry Index | 45.3 | 37.1 |
| Rank | 73 | 209 |
| Context | 1.05M | — |
| Input $/M | $0.83 | — |
| Output $/M | $2.50 | — |
| Weights | Open | Proprietary |

## Coding

- Hy4 preview: 51.6 (#38)
- Yi-Lightning: 27.4 (#320)

| Benchmark | Hy4 preview | Yi-Lightning |
|---|---|---|
| Aider Polyglot | — | 12.9% |
| LMArena WebDev | 1632 | — |
| LMArena Coding | — | 1312 |

## Reasoning

- Hy4 preview: 31.9 (#79)
- Yi-Lightning: 25.9 (#139)

| Benchmark | Hy4 preview | Yi-Lightning |
|---|---|---|
| NYT Connections (extended) | 68.2% | — |
| LMArena Hard Prompts | — | 1302 |

## Math

- Hy4 preview: 55.7 (#42)
- Yi-Lightning: 36.2 (#172)

| Benchmark | Hy4 preview | Yi-Lightning |
|---|---|---|
| ProofBench | 75% | — |
| LMArena Math | — | 1300 |

## Knowledge

- Hy4 preview: —
- Yi-Lightning: 35.4 (#185)

| Benchmark | Hy4 preview | Yi-Lightning |
|---|---|---|
| LMArena Expert | — | 1286 |

## Multilingual

- Hy4 preview: —
- Yi-Lightning: 42.2 (#196)

| Benchmark | Hy4 preview | Yi-Lightning |
|---|---|---|
| LMArena Non-English | — | 1269 |
| LMArena Chinese | — | 1320 |
| LMArena French | — | 1305 |
| LMArena German | — | 1267 |
| LMArena Japanese | — | 1228 |
| LMArena Korean | — | 1192 |
| LMArena Russian | — | 1255 |
| LMArena Spanish | — | 1315 |

## Instruction Following

- Hy4 preview: —
- Yi-Lightning: 67.4 (#196)

| Benchmark | Hy4 preview | Yi-Lightning |
|---|---|---|
| LMArena Instruction Following | — | 1278 |

## Long Context

- Hy4 preview: —
- Yi-Lightning: 39.4 (#181)

| Benchmark | Hy4 preview | Yi-Lightning |
|---|---|---|
| LMArena Longer Query | — | 1297 |

## Writing & Preference

- Hy4 preview: —
- Yi-Lightning: 50.2 (#184)

| Benchmark | Hy4 preview | Yi-Lightning |
|---|---|---|
| LMArena Text | — | 1302 |
| LMArena Creative Writing | — | 1280 |
| LMArena Multi-Turn | — | 1311 |

## FAQ

### Is Hy4 preview better than Yi-Lightning?

Hy4 preview is the stronger model overall, scoring 45.3 to 37.1 on the Noometry Index.

### Is Hy4 preview or Yi-Lightning better for coding?

Hy4 preview scores higher on coding benchmarks: 51.6 versus 27.4 in the Noometry coding category.

### How many benchmarks do Hy4 preview and Yi-Lightning share?

0 benchmarks have published results for both models. Hy4 preview has 3 scored results on Noometry and Yi-Lightning has 18.