# Kimi K2 (Jul 2025) vs Kimi K2.5 Instant

> Kimi K2.5 Instant is the stronger model overall, scoring 42.9 to 40.9 on the Noometry Index.

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

## Summary

- They share 16 benchmarks with published results for both. Kimi K2 (Jul 2025) scores higher in 3 categories and Kimi K2.5 Instant in 5 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Kimi K2.5 Instant leads 28.5 to 22.7.

## Snapshot

| | Kimi K2 (Jul 2025) | Kimi K2.5 Instant |
|---|---|---|
| Provider | Moonshot AI | Moonshot AI |
| Noometry Index | 40.9 | 42.9 |
| Rank | 134 | 92 |
| Context | 262K | — |
| Input $/M | $0.57 | — |
| Output $/M | $2.30 | — |
| Weights | Open | Open |

## Coding

- Kimi K2 (Jul 2025): 43.1 (#83)
- Kimi K2.5 Instant: 42.3 (#95)

| Benchmark | Kimi K2 (Jul 2025) | Kimi K2.5 Instant |
|---|---|---|
| LMArena Coding | 1399 | 1483 |
| SWE-bench Verified (bash only) | 63.4% | — |
| Aider Polyglot | 59.1% | — |
| LMArena WebDev | — | 1404 |
| GSO | 4.9% | — |
| WeirdML | 42.8% | — |
| ALE-Bench | 597.5 | — |

## Agentic & Tool Use

- Kimi K2 (Jul 2025): 32.2 (#59)
- Kimi K2.5 Instant: —

| Benchmark | Kimi K2 (Jul 2025) | Kimi K2.5 Instant |
|---|---|---|
| Terminal-Bench | 35.7% | — |
| Berkeley Function Calling Leaderboard | 59.1% | — |
| METR Time Horizons | 59.2% | — |

## Reasoning

- Kimi K2 (Jul 2025): 22.7 (#173)
- Kimi K2.5 Instant: 28.5 (#88)

| Benchmark | Kimi K2 (Jul 2025) | Kimi K2.5 Instant |
|---|---|---|
| LMArena Hard Prompts | 1384 | 1443 |
| SimpleBench | 26.3% | — |
| Kagi LLM Benchmark | 64.4% | — |
| Epoch Capabilities Index | 146.02 | — |
| ForecastBench | 60.2 | — |

## Math

- Kimi K2 (Jul 2025): 40.1 (#81)
- Kimi K2.5 Instant: 36.6 (#105)

| Benchmark | Kimi K2 (Jul 2025) | Kimi K2.5 Instant |
|---|---|---|
| LMArena Math | 1396 | 1443 |
| Omni-MATH | 65.4% | — |
| FrontierMath (Feb 2025 set) | 21.4% | — |
| FrontierMath Tier 4 (v1) | 0% | — |

## Knowledge

- Kimi K2 (Jul 2025): 36.9 (#153)
- Kimi K2.5 Instant: 39.5 (#121)

| Benchmark | Kimi K2 (Jul 2025) | Kimi K2.5 Instant |
|---|---|---|
| LMArena Expert | 1363 | 1438 |
| MMLU-Pro | 81.9% | — |
| Confabulations | 20.4% | — |
| Vectara Hallucination Rate | 17.9% | — |
| GPQA (HELM) | 65.3% | — |

## Multimodal

- Kimi K2 (Jul 2025): —
- Kimi K2.5 Instant: 39.5 (#47)

| Benchmark | Kimi K2 (Jul 2025) | Kimi K2.5 Instant |
|---|---|---|
| LMArena Vision | — | 1254 |

## Multilingual

- Kimi K2 (Jul 2025): 49.8 (#125)
- Kimi K2.5 Instant: 52.2 (#89)

| Benchmark | Kimi K2 (Jul 2025) | Kimi K2.5 Instant |
|---|---|---|
| LMArena Non-English | 1372 | 1406 |
| LMArena Chinese | 1416 | 1450 |
| LMArena French | 1379 | 1403 |
| LMArena German | 1386 | 1413 |
| LMArena Korean | 1324 | 1378 |
| LMArena Russian | 1384 | 1404 |
| LMArena Spanish | 1383 | 1448 |
| LMArena Japanese | 1349 | — |

## Instruction Following

- Kimi K2 (Jul 2025): 71.3 (#151)
- Kimi K2.5 Instant: 75.5 (#61)

| Benchmark | Kimi K2 (Jul 2025) | Kimi K2.5 Instant |
|---|---|---|
| LMArena Instruction Following | 1347 | 1430 |
| IFEval | 85% | — |

## Long Context

- Kimi K2 (Jul 2025): 41.2 (#140)
- Kimi K2.5 Instant: 43.8 (#82)

| Benchmark | Kimi K2 (Jul 2025) | Kimi K2.5 Instant |
|---|---|---|
| LMArena Longer Query | 1353 | 1435 |
| Fiction.LiveBench | 66.7% | — |
| CL-bench | 17.6% | — |

## Writing & Preference

- Kimi K2 (Jul 2025): 62.5 (#76)
- Kimi K2.5 Instant: 60.8 (#91)

| Benchmark | Kimi K2 (Jul 2025) | Kimi K2.5 Instant |
|---|---|---|
| LMArena Text | 1380 | 1420 |
| LMArena Creative Writing | 1349 | 1379 |
| LMArena Multi-Turn | 1371 | 1427 |
| Short-Story Creative Writing | 85.6% | — |
| EQ-Bench Creative Writing | 1666 | — |
| WildBench | 86.2% | — |

## FAQ

### Is Kimi K2 (Jul 2025) better than Kimi K2.5 Instant?

Kimi K2.5 Instant is the stronger model overall, scoring 42.9 to 40.9 on the Noometry Index.

### Is Kimi K2 (Jul 2025) or Kimi K2.5 Instant better for coding?

They score almost the same on coding (43.1 vs 42.3); test both on your own repository before choosing.

### How many benchmarks do Kimi K2 (Jul 2025) and Kimi K2.5 Instant share?

16 benchmarks have published results for both models. Kimi K2 (Jul 2025) has 42 scored results on Noometry and Kimi K2.5 Instant has 18.