# Kimi K2.5 Instant vs Mistral Medium

> Kimi K2.5 Instant is the stronger model overall, scoring 43.6 to 36.3 on the Noometry Index.

- Canonical page: https://noometry.com/compare/kimi-k2-5-instant-vs-mistral-medium
- Last updated: 2026-10-12
- Shared benchmarks: 17

## Summary

- They share 17 benchmarks with published results for both. Kimi K2.5 Instant scores higher in 8 categories and Mistral Medium in 1 category; 6 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Kimi K2.5 Instant leads 40.2 to 25.0.

## Snapshot

| | Kimi K2.5 Instant | Mistral Medium |
|---|---|---|
| Provider | Moonshot AI | Mistral AI |
| Noometry Index | 43.6 | 36.3 |
| Rank | 89 | 218 |
| Context | — | 262K |
| Input $/M | — | $1.50 |
| Output $/M | — | $7.50 |
| Weights | Open | Open |

## Coding

- Kimi K2.5 Instant: 42.6 (#97)
- Mistral Medium: 34.2 (#243)

| Benchmark | Kimi K2.5 Instant | Mistral Medium |
|---|---|---|
| LMArena Coding | 1484 | 1434 |
| FrontierCode | — | 8% |
| LMArena WebDev | 1404 | — |
| SciCode | — | 40.2% |
| WeirdML | — | 43.7% |
| ALE-Bench | — | 763.98 |

## Agentic & Tool Use

- Kimi K2.5 Instant: —
- Mistral Medium: 28.3 (#90)

| Benchmark | Kimi K2.5 Instant | Mistral Medium |
|---|---|---|
| Berkeley Function Calling Leaderboard | — | 37.7% |

## Reasoning

- Kimi K2.5 Instant: 29.7 (#90)
- Mistral Medium: 24.0 (#167)

| Benchmark | Kimi K2.5 Instant | Mistral Medium |
|---|---|---|
| LMArena Hard Prompts | 1443 | 1426 |
| Kagi LLM Benchmark | — | 50% |
| CritPt | — | 0% |
| DTBench | — | 75.5% |
| LMCA | — | 26.1% |
| Surface Evolver Bench | — | 26.9% |

## Math

- Kimi K2.5 Instant: 39.4 (#105)
- Mistral Medium: 28.1 (#245)

| Benchmark | Kimi K2.5 Instant | Mistral Medium |
|---|---|---|
| LMArena Math | 1442 | 1408 |
| OTIS Mock AIME 2024-2025 | — | 32.2% |
| ProofBench | — | 9% |
| MATH Level 5 | — | 81.6% |
| FrontierMath (Feb 2025 set) | — | 0.3% |

## Knowledge

- Kimi K2.5 Instant: 40.2 (#123)
- Mistral Medium: 25.0 (#265)

| Benchmark | Kimi K2.5 Instant | Mistral Medium |
|---|---|---|
| LMArena Expert | 1440 | 1408 |
| GPQA Diamond | — | 59.5% |
| Humanity's Last Exam | — | 4.5% |
| Vectara Hallucination Rate | — | 22.7% |

## Multimodal

- Kimi K2.5 Instant: 40.2 (#50)
- Mistral Medium: 35.3 (#88)

| Benchmark | Kimi K2.5 Instant | Mistral Medium |
|---|---|---|
| LMArena Vision | 1254 | 1172 |

## Multilingual

- Kimi K2.5 Instant: 52.0 (#94)
- Mistral Medium: 52.1 (#91)

| Benchmark | Kimi K2.5 Instant | Mistral Medium |
|---|---|---|
| LMArena Non-English | 1406 | 1408 |
| LMArena Chinese | 1449 | 1447 |
| LMArena French | 1403 | 1459 |
| LMArena German | 1413 | 1432 |
| LMArena Korean | 1378 | 1380 |
| LMArena Russian | 1404 | 1411 |
| LMArena Spanish | 1447 | 1433 |
| LMArena Japanese | — | 1378 |

## Instruction Following

- Kimi K2.5 Instant: 75.3 (#65)
- Mistral Medium: 73.7 (#116)

| Benchmark | Kimi K2.5 Instant | Mistral Medium |
|---|---|---|
| LMArena Instruction Following | 1430 | 1398 |

## Long Context

- Kimi K2.5 Instant: 43.9 (#83)
- Mistral Medium: 42.9 (#114)

| Benchmark | Kimi K2.5 Instant | Mistral Medium |
|---|---|---|
| LMArena Longer Query | 1435 | 1406 |

## Writing & Preference

- Kimi K2.5 Instant: 60.6 (#95)
- Mistral Medium: 60.0 (#103)

| Benchmark | Kimi K2.5 Instant | Mistral Medium |
|---|---|---|
| LMArena Text | 1420 | 1424 |
| LMArena Creative Writing | 1381 | 1391 |
| LMArena Multi-Turn | 1427 | 1418 |
| Short-Story Creative Writing | — | 77.3% |

## FAQ

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

Kimi K2.5 Instant is the stronger model overall, scoring 43.6 to 36.3 on the Noometry Index.

### Is Kimi K2.5 Instant or Mistral Medium better for coding?

Kimi K2.5 Instant scores higher on coding benchmarks: 42.6 versus 34.2 in the Noometry coding category.

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

17 benchmarks have published results for both models. Kimi K2.5 Instant has 18 scored results on Noometry and Mistral Medium has 36.