# Kimi K2.5 Instant vs Step 3

> Kimi K2.5 Instant is the stronger model overall, scoring 43.6 to 40.5 on the Noometry Index.

- Canonical page: https://noometry.com/compare/kimi-k2-5-instant-vs-step-3
- Last updated: 2026-10-11
- Shared benchmarks: 16

## Summary

- They share 16 benchmarks with published results for both. Kimi K2.5 Instant scores higher in 9 categories and Step 3 in 0 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where Kimi K2.5 Instant leads 60.6 to 54.3.

## Snapshot

| | Kimi K2.5 Instant | Step 3 |
|---|---|---|
| Provider | Moonshot AI | StepFun |
| Noometry Index | 43.6 | 40.5 |
| Rank | 89 | 149 |
| Context | — | — |
| Input $/M | — | — |
| Output $/M | — | — |
| Weights | Open | Open |

## Coding

- Kimi K2.5 Instant: 42.6 (#97)
- Step 3: 40.1 (#147)

| Benchmark | Kimi K2.5 Instant | Step 3 |
|---|---|---|
| LMArena Coding | 1484 | 1367 |
| LMArena WebDev | 1404 | — |

## Reasoning

- Kimi K2.5 Instant: 29.7 (#90)
- Step 3: 28.4 (#105)

| Benchmark | Kimi K2.5 Instant | Step 3 |
|---|---|---|
| LMArena Hard Prompts | 1443 | 1355 |
| Kagi LLM Benchmark | — | 62.3% |

## Math

- Kimi K2.5 Instant: 39.4 (#105)
- Step 3: 37.6 (#148)

| Benchmark | Kimi K2.5 Instant | Step 3 |
|---|---|---|
| LMArena Math | 1442 | 1366 |

## Knowledge

- Kimi K2.5 Instant: 40.2 (#123)
- Step 3: 36.8 (#164)

| Benchmark | Kimi K2.5 Instant | Step 3 |
|---|---|---|
| LMArena Expert | 1440 | 1333 |

## Multimodal

- Kimi K2.5 Instant: 40.2 (#50)
- Step 3: 35.5 (#86)

| Benchmark | Kimi K2.5 Instant | Step 3 |
|---|---|---|
| LMArena Vision | 1254 | 1177 |

## Multilingual

- Kimi K2.5 Instant: 52.0 (#94)
- Step 3: 46.3 (#159)

| Benchmark | Kimi K2.5 Instant | Step 3 |
|---|---|---|
| LMArena Non-English | 1406 | 1327 |
| LMArena Chinese | 1449 | 1397 |
| LMArena German | 1413 | 1371 |
| LMArena Korean | 1378 | 1269 |
| LMArena Russian | 1404 | 1331 |
| LMArena Spanish | 1447 | 1371 |
| LMArena French | 1403 | — |

## Instruction Following

- Kimi K2.5 Instant: 75.3 (#65)
- Step 3: 70.4 (#164)

| Benchmark | Kimi K2.5 Instant | Step 3 |
|---|---|---|
| LMArena Instruction Following | 1430 | 1332 |

## Long Context

- Kimi K2.5 Instant: 43.9 (#83)
- Step 3: 40.3 (#157)

| Benchmark | Kimi K2.5 Instant | Step 3 |
|---|---|---|
| LMArena Longer Query | 1435 | 1326 |

## Writing & Preference

- Kimi K2.5 Instant: 60.6 (#95)
- Step 3: 54.3 (#151)

| Benchmark | Kimi K2.5 Instant | Step 3 |
|---|---|---|
| LMArena Text | 1420 | 1350 |
| LMArena Creative Writing | 1381 | 1321 |
| LMArena Multi-Turn | 1427 | 1341 |

## FAQ

### Is Kimi K2.5 Instant better than Step 3?

Kimi K2.5 Instant is the stronger model overall, scoring 43.6 to 40.5 on the Noometry Index.

### Is Kimi K2.5 Instant or Step 3 better for coding?

Kimi K2.5 Instant scores higher on coding benchmarks: 42.6 versus 40.1 in the Noometry coding category.

### How many benchmarks do Kimi K2.5 Instant and Step 3 share?

16 benchmarks have published results for both models. Kimi K2.5 Instant has 18 scored results on Noometry and Step 3 has 17.