# Yi-34B vs Yi-Lightning

> Yi-Lightning is the stronger model overall, scoring 36.5 to 27.4 on the Noometry Index.

- Canonical page: https://noometry.com/compare/yi-34b-vs-yi-lightning
- Last updated: 2026-10-10
- Shared benchmarks: 17

## Summary

- They share 17 benchmarks with published results for both. Yi-34B scores higher in 1 category and Yi-Lightning in 7 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Yi-Lightning leads 34.8 to 7.5.
- Yi-34B has downloadable open weights; the other is API-only.

## Snapshot

| | Yi-34B | Yi-Lightning |
|---|---|---|
| Provider | 01.AI | 01.AI |
| Noometry Index | 27.4 | 36.5 |
| Rank | 325 | 206 |
| Context | — | — |
| Input $/M | — | — |
| Output $/M | — | — |
| Weights | Open | Proprietary |

## Coding

- Yi-34B: 31.8 (#269)
- Yi-Lightning: 27.0 (#315)

| Benchmark | Yi-34B | Yi-Lightning |
|---|---|---|
| LMArena Coding | 1112 | 1313 |
| Aider Polyglot | — | 12.9% |

## Reasoning

- Yi-34B: 20.3 (#222)
- Yi-Lightning: 24.9 (#137)

| Benchmark | Yi-34B | Yi-Lightning |
|---|---|---|
| LMArena Hard Prompts | 1104 | 1302 |
| BIG-Bench Hard | 71.7% | — |
| Epoch Capabilities Index | 117.28 | — |

## Math

- Yi-34B: 19.8 (#277)
- Yi-Lightning: 33.5 (#173)

| Benchmark | Yi-34B | Yi-Lightning |
|---|---|---|
| LMArena Math | 1114 | 1300 |
| MATH Level 5 | 5.1% | — |
| GSM8K | 76% | — |

## Knowledge

- Yi-34B: 7.5 (#304)
- Yi-Lightning: 34.8 (#182)

| Benchmark | Yi-34B | Yi-Lightning |
|---|---|---|
| LMArena Expert | 1061 | 1286 |
| GPQA Diamond | 14.7% | — |
| MMLU | 76.3% | — |

## Multilingual

- Yi-34B: 29.9 (#259)
- Yi-Lightning: 42.4 (#191)

| Benchmark | Yi-34B | Yi-Lightning |
|---|---|---|
| LMArena Non-English | 1079 | 1269 |
| LMArena Chinese | 1175 | 1320 |
| LMArena French | 1080 | 1304 |
| LMArena German | 1042 | 1267 |
| LMArena Japanese | 993 | 1228 |
| LMArena Korean | 959 | 1192 |
| LMArena Russian | 1050 | 1255 |
| LMArena Spanish | 1070 | 1315 |

## Instruction Following

- Yi-34B: 56.4 (#269)
- Yi-Lightning: 67.6 (#191)

| Benchmark | Yi-34B | Yi-Lightning |
|---|---|---|
| LMArena Instruction Following | 1091 | 1278 |

## Long Context

- Yi-34B: 33.2 (#259)
- Yi-Lightning: 39.4 (#176)

| Benchmark | Yi-34B | Yi-Lightning |
|---|---|---|
| LMArena Longer Query | 1094 | 1297 |

## Writing & Preference

- Yi-34B: 34.3 (#268)
- Yi-Lightning: 50.4 (#178)

| Benchmark | Yi-34B | Yi-Lightning |
|---|---|---|
| LMArena Text | 1129 | 1302 |
| LMArena Creative Writing | 1108 | 1280 |
| LMArena Multi-Turn | 1113 | 1311 |

## FAQ

### Is Yi-34B better than Yi-Lightning?

Yi-Lightning is the stronger model overall, scoring 36.5 to 27.4 on the Noometry Index.

### Is Yi-34B or Yi-Lightning better for coding?

Yi-34B scores higher on coding benchmarks: 31.8 versus 27.0 in the Noometry coding category.

### How many benchmarks do Yi-34B and Yi-Lightning share?

17 benchmarks have published results for both models. Yi-34B has 23 scored results on Noometry and Yi-Lightning has 18.