# Kimi K2 (Jul 2025) vs o3-pro

> o3-pro is the stronger model overall, scoring 42.7 to 40.9 on the Noometry Index. Kimi K2 (Jul 2025) costs 35× less per token, which makes it the better buy when o3-pro's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/kimi-k2-vs-o3-pro
- Last updated: 2026-10-10
- Shared benchmarks: 8

## Summary

- They share 8 benchmarks with published results for both. Kimi K2 (Jul 2025) scores higher in 2 categories and o3-pro in 3 categories; 5 gaps are clear of the uncertainty.
- The widest gap is in long context, where o3-pro leads 72.1 to 41.2.
- The biggest single-benchmark swing is Fiction.LiveBench: 66.7% for Kimi K2 (Jul 2025) and 97.2% for o3-pro.
- Kimi K2 (Jul 2025) is cheaper at $0.57 / $2.30 per million input/output tokens, against $20 / $80 for o3-pro.
- Kimi K2 (Jul 2025) accepts more context: 262K tokens versus 200K.
- Kimi K2 (Jul 2025) has downloadable open weights; the other is API-only.

## Snapshot

| | Kimi K2 (Jul 2025) | o3-pro |
|---|---|---|
| Provider | Moonshot AI | OpenAI |
| Noometry Index | 40.9 | 42.7 |
| Rank | 134 | 94 |
| Context | 262K | 200K |
| Input $/M | $0.57 | $20 |
| Output $/M | $2.30 | $80 |
| Weights | Open | Proprietary |

## Coding

- Kimi K2 (Jul 2025): 43.1 (#83)
- o3-pro: 55.1 (#22)

| Benchmark | Kimi K2 (Jul 2025) | o3-pro |
|---|---|---|
| Aider Polyglot | 59.1% | 84.9% |
| WeirdML | 42.8% | 58.2% |
| SWE-bench Verified (bash only) | 63.4% | — |
| GSO | 4.9% | — |
| LMArena Coding | 1399 | — |
| ALE-Bench | 597.5 | — |

## Agentic & Tool Use

- Kimi K2 (Jul 2025): 32.2 (#59)
- o3-pro: —

| Benchmark | Kimi K2 (Jul 2025) | o3-pro |
|---|---|---|
| Terminal-Bench | 35.7% | — |
| Berkeley Function Calling Leaderboard | 59.1% | — |
| METR Time Horizons | 59.2% | — |

## Reasoning

- Kimi K2 (Jul 2025): 22.7 (#173)
- o3-pro: 24.1 (#152)

| Benchmark | Kimi K2 (Jul 2025) | o3-pro |
|---|---|---|
| Kagi LLM Benchmark | 64.4% | 72.1% |
| Epoch Capabilities Index | 146.02 | 147.43 |
| ARC-AGI-2 | — | 4.9% |
| SimpleBench | 26.3% | — |
| ARC-AGI-1 | — | 59.3% |
| LMArena Hard Prompts | 1384 | — |
| DTBench | — | 86.9% |
| LMCA | — | 38.5% |
| ForecastBench | 60.2 | — |

## Math

- Kimi K2 (Jul 2025): 40.1 (#81)
- o3-pro: —

| Benchmark | Kimi K2 (Jul 2025) | o3-pro |
|---|---|---|
| Omni-MATH | 65.4% | — |
| LMArena Math | 1396 | — |
| FrontierMath (Feb 2025 set) | 21.4% | — |
| FrontierMath Tier 4 (v1) | 0% | — |

## Knowledge

- Kimi K2 (Jul 2025): 36.9 (#153)
- o3-pro: 29.0 (#234)

| Benchmark | Kimi K2 (Jul 2025) | o3-pro |
|---|---|---|
| Confabulations | 20.4% | 14.2% |
| Vectara Hallucination Rate | 17.9% | 23.3% |
| MMLU-Pro | 81.9% | — |
| GPQA (HELM) | 65.3% | — |
| LMArena Expert | 1363 | — |

## Multilingual

- Kimi K2 (Jul 2025): 49.8 (#125)
- o3-pro: —

| Benchmark | Kimi K2 (Jul 2025) | o3-pro |
|---|---|---|
| LMArena Non-English | 1372 | — |
| LMArena Chinese | 1416 | — |
| LMArena French | 1379 | — |
| LMArena German | 1386 | — |
| LMArena Japanese | 1349 | — |
| LMArena Korean | 1324 | — |
| LMArena Russian | 1384 | — |
| LMArena Spanish | 1383 | — |

## Instruction Following

- Kimi K2 (Jul 2025): 71.3 (#151)
- o3-pro: —

| Benchmark | Kimi K2 (Jul 2025) | o3-pro |
|---|---|---|
| IFEval | 85% | — |
| LMArena Instruction Following | 1347 | — |

## Long Context

- Kimi K2 (Jul 2025): 41.2 (#140)
- o3-pro: 72.1 (#1)

| Benchmark | Kimi K2 (Jul 2025) | o3-pro |
|---|---|---|
| Fiction.LiveBench | 66.7% | 97.2% |
| CL-bench | 17.6% | — |
| LMArena Longer Query | 1353 | — |

## Writing & Preference

- Kimi K2 (Jul 2025): 62.5 (#76)
- o3-pro: 57.1 (#128)

| Benchmark | Kimi K2 (Jul 2025) | o3-pro |
|---|---|---|
| Short-Story Creative Writing | 85.6% | 84.4% |
| LMArena Text | 1380 | — |
| LMArena Creative Writing | 1349 | — |
| EQ-Bench Creative Writing | 1666 | — |
| WildBench | 86.2% | — |
| LMArena Multi-Turn | 1371 | — |

## FAQ

### Is Kimi K2 (Jul 2025) better than o3-pro?

o3-pro is the stronger model overall, scoring 42.7 to 40.9 on the Noometry Index. Kimi K2 (Jul 2025) costs 35× less per token, which makes it the better buy when o3-pro's lead doesn't matter for your workload.

### Which is cheaper, Kimi K2 (Jul 2025) or o3-pro?

Kimi K2 (Jul 2025) is cheaper. It lists at $0.57 per million input tokens and $2.30 per million output tokens; o3-pro lists at $20 and $80.

### Is Kimi K2 (Jul 2025) or o3-pro better for coding?

o3-pro scores higher on coding benchmarks: 55.1 versus 43.1 in the Noometry coding category.

### Which has the bigger context window?

Kimi K2 (Jul 2025) does, with 262K tokens against 200K.

### How many benchmarks do Kimi K2 (Jul 2025) and o3-pro share?

8 benchmarks have published results for both models. Kimi K2 (Jul 2025) has 42 scored results on Noometry and o3-pro has 12.