# Kimi K2.5 Instant vs o3-pro

> Kimi K2.5 Instant and o3-pro score almost the same on the Noometry Index (42.9 vs 42.7), so choose on price, context window or the category you care about most.

- Canonical page: https://noometry.com/compare/kimi-k2-5-instant-vs-o3-pro
- Last updated: 2026-10-10
- Shared benchmarks: 0

## Summary

- The widest gap is in long context, where o3-pro leads 72.1 to 43.8.
- Kimi K2.5 Instant has downloadable open weights; the other is API-only.

## Snapshot

| | Kimi K2.5 Instant | o3-pro |
|---|---|---|
| Provider | Moonshot AI | OpenAI |
| Noometry Index | 42.9 | 42.7 |
| Rank | 92 | 94 |
| Context | — | 200K |
| Input $/M | — | $20 |
| Output $/M | — | $80 |
| Weights | Open | Proprietary |

## Coding

- Kimi K2.5 Instant: 42.3 (#95)
- o3-pro: 55.1 (#22)

| Benchmark | Kimi K2.5 Instant | o3-pro |
|---|---|---|
| Aider Polyglot | — | 84.9% |
| LMArena WebDev | 1404 | — |
| WeirdML | — | 58.2% |
| LMArena Coding | 1483 | — |

## Reasoning

- Kimi K2.5 Instant: 28.5 (#88)
- o3-pro: 24.1 (#152)

| Benchmark | Kimi K2.5 Instant | o3-pro |
|---|---|---|
| ARC-AGI-2 | — | 4.9% |
| Kagi LLM Benchmark | — | 72.1% |
| ARC-AGI-1 | — | 59.3% |
| LMArena Hard Prompts | 1443 | — |
| DTBench | — | 86.9% |
| LMCA | — | 38.5% |
| Epoch Capabilities Index | — | 147.43 |

## Math

- Kimi K2.5 Instant: 36.6 (#105)
- o3-pro: —

| Benchmark | Kimi K2.5 Instant | o3-pro |
|---|---|---|
| LMArena Math | 1443 | — |

## Knowledge

- Kimi K2.5 Instant: 39.5 (#121)
- o3-pro: 29.0 (#234)

| Benchmark | Kimi K2.5 Instant | o3-pro |
|---|---|---|
| Confabulations | — | 14.2% |
| Vectara Hallucination Rate | — | 23.3% |
| LMArena Expert | 1438 | — |

## Multimodal

- Kimi K2.5 Instant: 39.5 (#47)
- o3-pro: —

| Benchmark | Kimi K2.5 Instant | o3-pro |
|---|---|---|
| LMArena Vision | 1254 | — |

## Multilingual

- Kimi K2.5 Instant: 52.2 (#89)
- o3-pro: —

| Benchmark | Kimi K2.5 Instant | o3-pro |
|---|---|---|
| LMArena Non-English | 1406 | — |
| LMArena Chinese | 1450 | — |
| LMArena French | 1403 | — |
| LMArena German | 1413 | — |
| LMArena Korean | 1378 | — |
| LMArena Russian | 1404 | — |
| LMArena Spanish | 1448 | — |

## Instruction Following

- Kimi K2.5 Instant: 75.5 (#61)
- o3-pro: —

| Benchmark | Kimi K2.5 Instant | o3-pro |
|---|---|---|
| LMArena Instruction Following | 1430 | — |

## Long Context

- Kimi K2.5 Instant: 43.8 (#82)
- o3-pro: 72.1 (#1)

| Benchmark | Kimi K2.5 Instant | o3-pro |
|---|---|---|
| Fiction.LiveBench | — | 97.2% |
| LMArena Longer Query | 1435 | — |

## Writing & Preference

- Kimi K2.5 Instant: 60.8 (#91)
- o3-pro: 57.1 (#128)

| Benchmark | Kimi K2.5 Instant | o3-pro |
|---|---|---|
| LMArena Text | 1420 | — |
| LMArena Creative Writing | 1379 | — |
| Short-Story Creative Writing | — | 84.4% |
| LMArena Multi-Turn | 1427 | — |

## FAQ

### Is Kimi K2.5 Instant better than o3-pro?

Kimi K2.5 Instant and o3-pro score almost the same on the Noometry Index (42.9 vs 42.7), so choose on price, context window or the category you care about most.

### Is Kimi K2.5 Instant or o3-pro better for coding?

o3-pro scores higher on coding benchmarks: 55.1 versus 42.3 in the Noometry coding category.

### How many benchmarks do Kimi K2.5 Instant and o3-pro share?

0 benchmarks have published results for both models. Kimi K2.5 Instant has 18 scored results on Noometry and o3-pro has 12.