# Claude Opus 4 vs Kimi K2.5 Instant

> Claude Opus 4 and Kimi K2.5 Instant score almost the same on the Noometry Index (43.1 vs 43.6), so choose on price, context window or the category you care about most.

- Canonical page: https://noometry.com/compare/claude-opus-4-vs-kimi-k2-5-instant
- Last updated: 2026-10-12
- Shared benchmarks: 17

## Summary

- They share 17 benchmarks with published results for both. Claude Opus 4 scores higher in 5 categories and Kimi K2.5 Instant in 4 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in multimodal, where Kimi K2.5 Instant leads 40.2 to 31.5.
- Kimi K2.5 Instant has downloadable open weights; the other is API-only.

## Snapshot

| | Claude Opus 4 | Kimi K2.5 Instant |
|---|---|---|
| Provider | Anthropic | Moonshot AI |
| Noometry Index | 43.1 | 43.6 |
| Rank | 100 | 89 |
| Context | 200K | — |
| Input $/M | $15 | — |
| Output $/M | $75 | — |
| Weights | Proprietary | Open |

## Coding

- Claude Opus 4: 47.2 (#62)
- Kimi K2.5 Instant: 42.6 (#97)

| Benchmark | Claude Opus 4 | Kimi K2.5 Instant |
|---|---|---|
| LMArena Coding | 1442 | 1484 |
| SWE-bench Verified | 70.7% | — |
| SWE-bench Verified (bash only) | 67.6% | — |
| Aider Polyglot | 72% | — |
| LMArena WebDev | — | 1404 |
| GSO | 6.9% | — |
| WeirdML | 43.7% | — |
| AlgoTune | 1.33 | — |

## Agentic & Tool Use

- Claude Opus 4: 34.8 (#42)
- Kimi K2.5 Instant: —

| Benchmark | Claude Opus 4 | Kimi K2.5 Instant |
|---|---|---|
| Cybench | 38% | — |
| DeepResearch Bench | 46.8% | — |
| LMArena Search | 1127 | — |
| METR Time Horizons | 63.9% | — |

## Reasoning

- Claude Opus 4: 27.3 (#121)
- Kimi K2.5 Instant: 29.7 (#90)

| Benchmark | Claude Opus 4 | Kimi K2.5 Instant |
|---|---|---|
| LMArena Hard Prompts | 1399 | 1443 |
| ARC-AGI-2 | 8.6% | — |
| SimpleBench | 58.8% | — |
| Kagi LLM Benchmark | 74.3% | — |
| ARC-AGI-1 | 35.7% | — |
| CritPt | 0.3% | — |
| EnigmaEval | 5.6% | — |
| DTBench | 81.6% | — |
| LMCA | 37.4% | — |
| Epoch Capabilities Index | 142.67 | — |
| ForecastBench | 61.1 | — |

## Math

- Claude Opus 4: 42.0 (#86)
- Kimi K2.5 Instant: 39.4 (#105)

| Benchmark | Claude Opus 4 | Kimi K2.5 Instant |
|---|---|---|
| LMArena Math | 1390 | 1442 |
| OTIS Mock AIME 2024-2025 | 64.4% | — |
| Omni-MATH | 61.6% | — |
| MATH Level 5 | 85% | — |
| FrontierMath (Feb 2025 set) | 4.5% | — |
| FrontierMath Tier 4 (v1) | 4.2% | — |

## Knowledge

- Claude Opus 4: 44.0 (#88)
- Kimi K2.5 Instant: 40.2 (#123)

| Benchmark | Claude Opus 4 | Kimi K2.5 Instant |
|---|---|---|
| LMArena Expert | 1386 | 1440 |
| GPQA Diamond | 76.3% | — |
| Humanity's Last Exam | 10.7% | — |
| MMLU-Pro | 87.5% | — |
| Confabulations | 15.9% | — |
| Vectara Hallucination Rate | 12% | — |
| GPQA (HELM) | 70.8% | — |

## Multimodal

- Claude Opus 4: 31.5 (#106)
- Kimi K2.5 Instant: 40.2 (#50)

| Benchmark | Claude Opus 4 | Kimi K2.5 Instant |
|---|---|---|
| LMArena Vision | 1192 | 1254 |
| GeoBench | 49% | — |
| VPCT | 38% | — |

## Multilingual

- Claude Opus 4: 48.8 (#138)
- Kimi K2.5 Instant: 52.0 (#94)

| Benchmark | Claude Opus 4 | Kimi K2.5 Instant |
|---|---|---|
| LMArena Non-English | 1362 | 1406 |
| LMArena Chinese | 1386 | 1449 |
| LMArena French | 1372 | 1403 |
| LMArena German | 1391 | 1413 |
| LMArena Korean | 1321 | 1378 |
| LMArena Russian | 1392 | 1404 |
| LMArena Spanish | 1389 | 1447 |
| LMArena Japanese | 1331 | — |

## Instruction Following

- Claude Opus 4: 77.1 (#28)
- Kimi K2.5 Instant: 75.3 (#65)

| Benchmark | Claude Opus 4 | Kimi K2.5 Instant |
|---|---|---|
| LMArena Instruction Following | 1406 | 1430 |
| IFEval | 91.8% | — |

## Long Context

- Claude Opus 4: 39.6 (#172)
- Kimi K2.5 Instant: 43.9 (#83)

| Benchmark | Claude Opus 4 | Kimi K2.5 Instant |
|---|---|---|
| LMArena Longer Query | 1422 | 1435 |
| Fiction.LiveBench | 61.1% | — |

## Writing & Preference

- Claude Opus 4: 61.2 (#89)
- Kimi K2.5 Instant: 60.6 (#95)

| Benchmark | Claude Opus 4 | Kimi K2.5 Instant |
|---|---|---|
| LMArena Text | 1377 | 1420 |
| LMArena Creative Writing | 1387 | 1381 |
| LMArena Multi-Turn | 1396 | 1427 |
| Short-Story Creative Writing | 83.6% | — |
| EQ-Bench Creative Writing | 1580 | — |
| WildBench | 85.2% | — |

## FAQ

### Is Claude Opus 4 better than Kimi K2.5 Instant?

Claude Opus 4 and Kimi K2.5 Instant score almost the same on the Noometry Index (43.1 vs 43.6), so choose on price, context window or the category you care about most.

### Is Claude Opus 4 or Kimi K2.5 Instant better for coding?

Claude Opus 4 scores higher on coding benchmarks: 47.2 versus 42.6 in the Noometry coding category.

### How many benchmarks do Claude Opus 4 and Kimi K2.5 Instant share?

17 benchmarks have published results for both models. Claude Opus 4 has 56 scored results on Noometry and Kimi K2.5 Instant has 18.