# Kimi K2.5 Instant vs Mistral Medium 3.1

> Kimi K2.5 Instant is the stronger model overall, scoring 43.6 to 31.9 on the Noometry Index.

- Canonical page: https://noometry.com/compare/kimi-k2-5-instant-vs-mistral-medium-3-1
- Last updated: 2026-10-12
- Shared benchmarks: 0

## Summary

- The widest gap is in reasoning, where Kimi K2.5 Instant leads 29.7 to 10.6.
- Kimi K2.5 Instant has downloadable open weights; the other is API-only.

## Snapshot

| | Kimi K2.5 Instant | Mistral Medium 3.1 |
|---|---|---|
| Provider | Moonshot AI | Mistral AI |
| Noometry Index | 43.6 | 31.9 |
| Rank | 89 | 266 |
| Context | — | 131K |
| Input $/M | — | $0.40 |
| Output $/M | — | $2 |
| Weights | Open | Proprietary |

## Coding

- Kimi K2.5 Instant: 42.6 (#97)
- Mistral Medium 3.1: —

| Benchmark | Kimi K2.5 Instant | Mistral Medium 3.1 |
|---|---|---|
| LMArena WebDev | 1404 | — |
| LMArena Coding | 1484 | — |

## Reasoning

- Kimi K2.5 Instant: 29.7 (#90)
- Mistral Medium 3.1: 10.6 (#341)

| Benchmark | Kimi K2.5 Instant | Mistral Medium 3.1 |
|---|---|---|
| NYT Connections (extended) | — | 6.5% |
| Thematic Generalization | — | 20.3% |
| LMArena Hard Prompts | 1443 | — |

## Math

- Kimi K2.5 Instant: 39.4 (#105)
- Mistral Medium 3.1: —

| Benchmark | Kimi K2.5 Instant | Mistral Medium 3.1 |
|---|---|---|
| LMArena Math | 1442 | — |

## Knowledge

- Kimi K2.5 Instant: 40.2 (#123)
- Mistral Medium 3.1: —

| Benchmark | Kimi K2.5 Instant | Mistral Medium 3.1 |
|---|---|---|
| LMArena Expert | 1440 | — |

## Multimodal

- Kimi K2.5 Instant: 40.2 (#50)
- Mistral Medium 3.1: —

| Benchmark | Kimi K2.5 Instant | Mistral Medium 3.1 |
|---|---|---|
| LMArena Vision | 1254 | — |

## Multilingual

- Kimi K2.5 Instant: 52.0 (#94)
- Mistral Medium 3.1: —

| Benchmark | Kimi K2.5 Instant | Mistral Medium 3.1 |
|---|---|---|
| LMArena Non-English | 1406 | — |
| LMArena Chinese | 1449 | — |
| LMArena French | 1403 | — |
| LMArena German | 1413 | — |
| LMArena Korean | 1378 | — |
| LMArena Russian | 1404 | — |
| LMArena Spanish | 1447 | — |

## Instruction Following

- Kimi K2.5 Instant: 75.3 (#65)
- Mistral Medium 3.1: —

| Benchmark | Kimi K2.5 Instant | Mistral Medium 3.1 |
|---|---|---|
| LMArena Instruction Following | 1430 | — |

## Long Context

- Kimi K2.5 Instant: 43.9 (#83)
- Mistral Medium 3.1: —

| Benchmark | Kimi K2.5 Instant | Mistral Medium 3.1 |
|---|---|---|
| LMArena Longer Query | 1435 | — |

## Writing & Preference

- Kimi K2.5 Instant: 60.6 (#95)
- Mistral Medium 3.1: 55.5 (#145)

| Benchmark | Kimi K2.5 Instant | Mistral Medium 3.1 |
|---|---|---|
| LMArena Text | 1420 | — |
| LMArena Creative Writing | 1381 | — |
| EQ-Bench Creative Writing | — | 1476 |
| LMArena Multi-Turn | 1427 | — |

## FAQ

### Is Kimi K2.5 Instant better than Mistral Medium 3.1?

Kimi K2.5 Instant is the stronger model overall, scoring 43.6 to 31.9 on the Noometry Index.

### How many benchmarks do Kimi K2.5 Instant and Mistral Medium 3.1 share?

0 benchmarks have published results for both models. Kimi K2.5 Instant has 18 scored results on Noometry and Mistral Medium 3.1 has 3.