# Kimi K2.5 Instant vs o1

> Kimi K2.5 Instant is the stronger model overall, scoring 43.6 to 40.9 on the Noometry Index.

- Canonical page: https://noometry.com/compare/kimi-k2-5-instant-vs-o1
- Last updated: 2026-10-11
- Shared benchmarks: 17

## Summary

- They share 17 benchmarks with published results for both. Kimi K2.5 Instant scores higher in 6 categories and o1 in 3 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in long context, where o1 leads 50.3 to 43.9.
- Kimi K2.5 Instant has downloadable open weights; the other is API-only.

## Snapshot

| | Kimi K2.5 Instant | o1 |
|---|---|---|
| Provider | Moonshot AI | OpenAI |
| Noometry Index | 43.6 | 40.9 |
| Rank | 89 | 143 |
| Context | — | 200K |
| Input $/M | — | $15 |
| Output $/M | — | $60 |
| Weights | Open | Proprietary |

## Coding

- Kimi K2.5 Instant: 42.6 (#97)
- o1: 46.1 (#70)

| Benchmark | Kimi K2.5 Instant | o1 |
|---|---|---|
| LMArena Coding | 1484 | 1367 |
| Aider Polyglot | — | 61.7% |
| LMArena WebDev | 1404 | — |
| WeirdML | — | 47.6% |
| LiveBench Coding | — | 69.7% |
| CadEval | — | 56% |
| HumanEval+ | — | 89% |
| MBPP+ | — | 80.2% |

## Agentic & Tool Use

- Kimi K2.5 Instant: —
- o1: 24.6 (#117)

| Benchmark | Kimi K2.5 Instant | o1 |
|---|---|---|
| Cybench | — | 10% |
| METR Time Horizons | — | 51.1% |

## Reasoning

- Kimi K2.5 Instant: 29.7 (#90)
- o1: 27.9 (#111)

| Benchmark | Kimi K2.5 Instant | o1 |
|---|---|---|
| LMArena Hard Prompts | 1443 | 1371 |
| SimpleBench | — | 41.7% |
| ARC-AGI-1 | — | 30.7% |
| Chess Puzzles | — | 15% |
| EnigmaEval | — | 5.7% |
| LiveBench Reasoning | — | 91.6% |
| DTBench | — | 74.7% |
| LiveBench Data Analysis | — | 65.5% |
| LMCA | — | 22.3% |
| Epoch Capabilities Index | — | 141.91 |
| LiveBench | — | 75.7% |

## Math

- Kimi K2.5 Instant: 39.4 (#105)
- o1: 36.1 (#175)

| Benchmark | Kimi K2.5 Instant | o1 |
|---|---|---|
| LMArena Math | 1442 | 1388 |
| FrontierMath (Tiers 1-3) | — | 14.7% |
| OTIS Mock AIME 2024-2025 | — | 73.3% |
| LiveBench Math | — | 80.3% |
| MATH Level 5 | — | 94.7% |
| FrontierMath (Feb 2025 set) | — | 9.3% |

## Knowledge

- Kimi K2.5 Instant: 40.2 (#123)
- o1: 41.5 (#110)

| Benchmark | Kimi K2.5 Instant | o1 |
|---|---|---|
| LMArena Expert | 1440 | 1361 |
| GPQA Diamond | — | 76.8% |
| Humanity's Last Exam | — | 8% |
| SimpleQA Verified | — | 41.1% |
| Confabulations | — | 11.7% |

## Multimodal

- Kimi K2.5 Instant: 40.2 (#50)
- o1: 34.2 (#93)

| Benchmark | Kimi K2.5 Instant | o1 |
|---|---|---|
| LMArena Vision | 1254 | 1168 |
| GeoBench | — | 80% |
| VPCT | — | 37% |
| SpatialViz-Bench | — | 41.4% |

## Multilingual

- Kimi K2.5 Instant: 52.0 (#94)
- o1: 48.6 (#142)

| Benchmark | Kimi K2.5 Instant | o1 |
|---|---|---|
| LMArena Non-English | 1406 | 1358 |
| LMArena Chinese | 1449 | 1394 |
| LMArena French | 1403 | 1344 |
| LMArena German | 1413 | 1337 |
| LMArena Korean | 1378 | 1396 |
| LMArena Russian | 1404 | 1356 |
| LMArena Spanish | 1447 | 1345 |
| LMArena Japanese | — | 1346 |

## Instruction Following

- Kimi K2.5 Instant: 75.3 (#65)
- o1: 74.8 (#86)

| Benchmark | Kimi K2.5 Instant | o1 |
|---|---|---|
| LMArena Instruction Following | 1430 | 1367 |
| LiveBench Instruction Following | — | 81.5% |

## Long Context

- Kimi K2.5 Instant: 43.9 (#83)
- o1: 50.3 (#9)

| Benchmark | Kimi K2.5 Instant | o1 |
|---|---|---|
| LMArena Longer Query | 1435 | 1378 |
| Fiction.LiveBench | — | 83.3% |

## Writing & Preference

- Kimi K2.5 Instant: 60.6 (#95)
- o1: 55.6 (#144)

| Benchmark | Kimi K2.5 Instant | o1 |
|---|---|---|
| LMArena Text | 1420 | 1366 |
| LMArena Creative Writing | 1381 | 1348 |
| LMArena Multi-Turn | 1427 | 1369 |
| Short-Story Creative Writing | — | 70.2% |
| LiveBench Language | — | 65.4% |

## FAQ

### Is Kimi K2.5 Instant better than o1?

Kimi K2.5 Instant is the stronger model overall, scoring 43.6 to 40.9 on the Noometry Index.

### Is Kimi K2.5 Instant or o1 better for coding?

o1 scores higher on coding benchmarks: 46.1 versus 42.6 in the Noometry coding category.

### How many benchmarks do Kimi K2.5 Instant and o1 share?

17 benchmarks have published results for both models. Kimi K2.5 Instant has 18 scored results on Noometry and o1 has 52.