# Kimi K2.5 Instant vs o3

> o3 is the stronger model overall, scoring 47.5 to 43.6 on the Noometry Index.

- Canonical page: https://noometry.com/compare/kimi-k2-5-instant-vs-o3
- 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 2 categories and o3 in 7 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where o3 leads 54.6 to 40.2.
- Kimi K2.5 Instant has downloadable open weights; the other is API-only.

## Snapshot

| | Kimi K2.5 Instant | o3 |
|---|---|---|
| Provider | Moonshot AI | OpenAI |
| Noometry Index | 43.6 | 47.5 |
| Rank | 89 | 61 |
| Context | — | 200K |
| Input $/M | — | $2 |
| Output $/M | — | $8 |
| Weights | Open | Proprietary |

## Coding

- Kimi K2.5 Instant: 42.6 (#97)
- o3: 46.8 (#64)

| Benchmark | Kimi K2.5 Instant | o3 |
|---|---|---|
| LMArena Coding | 1484 | 1408 |
| SWE-bench Verified | — | 62.3% |
| SWE-bench Verified (bash only) | — | 58.4% |
| Aider Polyglot | — | 81.3% |
| LMArena WebDev | 1404 | — |
| GSO | — | 8.8% |
| WeirdML | — | 52.4% |
| CadEval | — | 74% |
| ALE-Bench | — | 933.55 |

## Agentic & Tool Use

- Kimi K2.5 Instant: —
- o3: 34.5 (#44)

| Benchmark | Kimi K2.5 Instant | o3 |
|---|---|---|
| Berkeley Function Calling Leaderboard | — | 63% |
| GDPval | — | 30.8% |
| DeepResearch Bench | — | 45.2% |
| OSWorld | — | 23% |
| LMArena Search | — | 1144 |
| METR Time Horizons | — | 65.4% |

## Reasoning

- Kimi K2.5 Instant: 29.7 (#90)
- o3: 32.0 (#78)

| Benchmark | Kimi K2.5 Instant | o3 |
|---|---|---|
| LMArena Hard Prompts | 1443 | 1402 |
| ARC-AGI-2 | — | 6.5% |
| SimpleBench | — | 53.1% |
| Kagi LLM Benchmark | — | 67.6% |
| ARC-AGI-1 | — | 60.8% |
| CritPt | — | 1.4% |
| Chess Puzzles | — | 38% |
| EnigmaEval | — | 13.1% |
| Mystery Game Puzzles | — | 29% |
| DTBench | — | 84.8% |
| LMCA | — | 39.7% |
| Epoch Capabilities Index | — | 146.86 |
| ForecastBench | — | 62.5 |

## Math

- Kimi K2.5 Instant: 39.4 (#105)
- o3: 50.2 (#58)

| Benchmark | Kimi K2.5 Instant | o3 |
|---|---|---|
| LMArena Math | 1442 | 1426 |
| FrontierMath (Tiers 1-3) | — | 33.3% |
| OTIS Mock AIME 2024-2025 | — | 84.4% |
| Omni-MATH | — | 71.4% |
| MATH Level 5 | — | 97.8% |
| FrontierMath (Feb 2025 set) | — | 18.7% |
| FrontierMath Tier 4 (v1) | — | 2.1% |

## Knowledge

- Kimi K2.5 Instant: 40.2 (#123)
- o3: 54.6 (#52)

| Benchmark | Kimi K2.5 Instant | o3 |
|---|---|---|
| LMArena Expert | 1440 | 1402 |
| GPQA Diamond | — | 81.8% |
| Humanity's Last Exam | — | 20.3% |
| SimpleQA Verified | — | 49.4% |
| MMLU-Pro | — | 85.9% |
| Confabulations | — | 14.4% |
| GPQA (HELM) | — | 75.3% |

## Multimodal

- Kimi K2.5 Instant: 40.2 (#50)
- o3: 41.4 (#36)

| Benchmark | Kimi K2.5 Instant | o3 |
|---|---|---|
| LMArena Vision | 1254 | 1214 |
| GeoBench | — | 74% |
| VPCT | — | 52% |

## Multilingual

- Kimi K2.5 Instant: 52.0 (#94)
- o3: 51.7 (#105)

| Benchmark | Kimi K2.5 Instant | o3 |
|---|---|---|
| LMArena Non-English | 1406 | 1401 |
| LMArena Chinese | 1449 | 1437 |
| LMArena French | 1403 | 1430 |
| LMArena German | 1413 | 1420 |
| LMArena Korean | 1378 | 1370 |
| LMArena Russian | 1404 | 1406 |
| LMArena Spanish | 1447 | 1395 |
| LMArena Japanese | — | 1403 |

## Instruction Following

- Kimi K2.5 Instant: 75.3 (#65)
- o3: 72.8 (#127)

| Benchmark | Kimi K2.5 Instant | o3 |
|---|---|---|
| LMArena Instruction Following | 1430 | 1368 |
| IFEval | — | 86.9% |

## Long Context

- Kimi K2.5 Instant: 43.9 (#83)
- o3: 53.3 (#6)

| Benchmark | Kimi K2.5 Instant | o3 |
|---|---|---|
| LMArena Longer Query | 1435 | 1372 |
| Fiction.LiveBench | — | 88.9% |
| CL-bench | — | 17.8% |

## Writing & Preference

- Kimi K2.5 Instant: 60.6 (#95)
- o3: 63.5 (#64)

| Benchmark | Kimi K2.5 Instant | o3 |
|---|---|---|
| LMArena Text | 1420 | 1410 |
| LMArena Creative Writing | 1381 | 1359 |
| LMArena Multi-Turn | 1427 | 1405 |
| Short-Story Creative Writing | — | 83.9% |
| EQ-Bench Creative Writing | — | 1676 |
| WildBench | — | 86.1% |

## FAQ

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

o3 is the stronger model overall, scoring 47.5 to 43.6 on the Noometry Index.

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

o3 scores higher on coding benchmarks: 46.8 versus 42.6 in the Noometry coding category.

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

17 benchmarks have published results for both models. Kimi K2.5 Instant has 18 scored results on Noometry and o3 has 63.