# Kimi K2.5 Instant vs Yi-Lightning

> Kimi K2.5 Instant is the stronger model overall, scoring 42.9 to 36.5 on the Noometry Index.

- Canonical page: https://noometry.com/compare/kimi-k2-5-instant-vs-yi-lightning
- Last updated: 2026-10-10
- Shared benchmarks: 16

## Summary

- They share 16 benchmarks with published results for both. Kimi K2.5 Instant scores higher in 8 categories and Yi-Lightning in 0 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in coding, where Kimi K2.5 Instant leads 42.3 to 27.0.
- Kimi K2.5 Instant has downloadable open weights; the other is API-only.

## Snapshot

| | Kimi K2.5 Instant | Yi-Lightning |
|---|---|---|
| Provider | Moonshot AI | 01.AI |
| Noometry Index | 42.9 | 36.5 |
| Rank | 92 | 206 |
| Context | — | — |
| Input $/M | — | — |
| Output $/M | — | — |
| Weights | Open | Proprietary |

## Coding

- Kimi K2.5 Instant: 42.3 (#95)
- Yi-Lightning: 27.0 (#315)

| Benchmark | Kimi K2.5 Instant | Yi-Lightning |
|---|---|---|
| LMArena Coding | 1483 | 1313 |
| Aider Polyglot | — | 12.9% |
| LMArena WebDev | 1404 | — |

## Reasoning

- Kimi K2.5 Instant: 28.5 (#88)
- Yi-Lightning: 24.9 (#137)

| Benchmark | Kimi K2.5 Instant | Yi-Lightning |
|---|---|---|
| LMArena Hard Prompts | 1443 | 1302 |

## Math

- Kimi K2.5 Instant: 36.6 (#105)
- Yi-Lightning: 33.5 (#173)

| Benchmark | Kimi K2.5 Instant | Yi-Lightning |
|---|---|---|
| LMArena Math | 1443 | 1300 |

## Knowledge

- Kimi K2.5 Instant: 39.5 (#121)
- Yi-Lightning: 34.8 (#182)

| Benchmark | Kimi K2.5 Instant | Yi-Lightning |
|---|---|---|
| LMArena Expert | 1438 | 1286 |

## Multimodal

- Kimi K2.5 Instant: 39.5 (#47)
- Yi-Lightning: —

| Benchmark | Kimi K2.5 Instant | Yi-Lightning |
|---|---|---|
| LMArena Vision | 1254 | — |

## Multilingual

- Kimi K2.5 Instant: 52.2 (#89)
- Yi-Lightning: 42.4 (#191)

| Benchmark | Kimi K2.5 Instant | Yi-Lightning |
|---|---|---|
| LMArena Non-English | 1406 | 1269 |
| LMArena Chinese | 1450 | 1320 |
| LMArena French | 1403 | 1304 |
| LMArena German | 1413 | 1267 |
| LMArena Korean | 1378 | 1192 |
| LMArena Russian | 1404 | 1255 |
| LMArena Spanish | 1448 | 1315 |
| LMArena Japanese | — | 1228 |

## Instruction Following

- Kimi K2.5 Instant: 75.5 (#61)
- Yi-Lightning: 67.6 (#191)

| Benchmark | Kimi K2.5 Instant | Yi-Lightning |
|---|---|---|
| LMArena Instruction Following | 1430 | 1278 |

## Long Context

- Kimi K2.5 Instant: 43.8 (#82)
- Yi-Lightning: 39.4 (#176)

| Benchmark | Kimi K2.5 Instant | Yi-Lightning |
|---|---|---|
| LMArena Longer Query | 1435 | 1297 |

## Writing & Preference

- Kimi K2.5 Instant: 60.8 (#91)
- Yi-Lightning: 50.4 (#178)

| Benchmark | Kimi K2.5 Instant | Yi-Lightning |
|---|---|---|
| LMArena Text | 1420 | 1302 |
| LMArena Creative Writing | 1379 | 1280 |
| LMArena Multi-Turn | 1427 | 1311 |

## FAQ

### Is Kimi K2.5 Instant better than Yi-Lightning?

Kimi K2.5 Instant is the stronger model overall, scoring 42.9 to 36.5 on the Noometry Index.

### Is Kimi K2.5 Instant or Yi-Lightning better for coding?

Kimi K2.5 Instant scores higher on coding benchmarks: 42.3 versus 27.0 in the Noometry coding category.

### How many benchmarks do Kimi K2.5 Instant and Yi-Lightning share?

16 benchmarks have published results for both models. Kimi K2.5 Instant has 18 scored results on Noometry and Yi-Lightning has 18.