# Claude 3.5 Sonnet vs Kimi K3

> Kimi K3 is the stronger model overall, scoring 59.5 to 34.6 on the Noometry Index.

- Canonical page: https://noometry.com/compare/claude-3-5-sonnet-vs-kimi-k3
- Last updated: 2026-10-10
- Shared benchmarks: 25

## Summary

- They share 25 benchmarks with published results for both. Claude 3.5 Sonnet scores higher in 0 categories and Kimi K3 in 10 categories; 10 gaps are clear of the uncertainty.
- The widest gap is in math, where Kimi K3 leads 74.2 to 19.2.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 8.5% for Claude 3.5 Sonnet and 97.2% for Kimi K3.
- Kimi K3 has downloadable open weights; the other is API-only.

## Snapshot

| | Claude 3.5 Sonnet | Kimi K3 |
|---|---|---|
| Provider | Anthropic | Moonshot AI |
| Noometry Index | 34.6 | 59.5 |
| Rank | 231 | 15 |
| Context | — | 1.05M |
| Input $/M | — | $3 |
| Output $/M | — | $15 |
| Weights | Proprietary | Open |

## Coding

- Claude 3.5 Sonnet: 39.0 (#165)
- Kimi K3: 61.0 (#10)

| Benchmark | Claude 3.5 Sonnet | Kimi K3 |
|---|---|---|
| WeirdML | 40% | 82.6% |
| LMArena Coding | 1342 | 1508 |
| DeepSWE | — | 68.5% |
| FrontierCode | — | 44.2% |
| Aider Polyglot | 51.6% | — |
| LMArena WebDev | — | 1654 |
| FrontierSWE | — | 25.9% |
| SciCode | — | 59.5% |
| GSO | 4.6% | — |
| BigCodeBench Instruct | 46.8% | — |
| LiveBench Coding | 67.1% | — |
| BigCodeBench Complete | 58.6% | — |
| CadEval | 48% | — |
| ALE-Bench | — | 1,524 |
| HumanEval+ | 81.7% | — |
| MBPP+ | 74.3% | — |

## Agentic & Tool Use

- Claude 3.5 Sonnet: 32.3 (#67)
- Kimi K3: 41.8 (#20)

| Benchmark | Claude 3.5 Sonnet | Kimi K3 |
|---|---|---|
| APEX-Agents | — | 50.6% |
| TheAgentCompany | 24% | — |
| τ²-bench Banking | — | 37.1% |
| Cybench | 17.5% | — |
| PostTrainBench | — | 32% |
| BALROG | 32.6% | — |
| GBAEval | — | 48.3% |
| GDP.pdf | — | 19% |
| METR Time Horizons | 45.2% | — |
| Vending-Bench 2 | — | 5,165 |

## Reasoning

- Claude 3.5 Sonnet: 23.1 (#183)
- Kimi K3: 63.0 (#17)

| Benchmark | Claude 3.5 Sonnet | Kimi K3 |
|---|---|---|
| SimpleBench | 41.4% | 60.7% |
| LMArena Hard Prompts | 1305 | 1496 |
| DTBench | 67.8% | 91.2% |
| Epoch Capabilities Index | 133.55 | 157.45 |
| ForecastBench | 60.7 | 61.1 |
| ARC-AGI-2 | — | 60.4% |
| NYT Connections (extended) | — | 93.6% |
| ARC-AGI-1 | — | 94.5% |
| CritPt | — | 23.4% |
| Chess Puzzles | — | 39% |
| EnigmaEval | 0.9% | — |
| LiveBench Reasoning | 56.7% | — |
| Mystery Game Puzzles | — | 26% |
| LiveBench Data Analysis | 55% | — |
| LMCA | — | 52.7% |
| Surface Evolver Bench | — | 95% |
| LiveBench | 59% | — |

## Math

- Claude 3.5 Sonnet: 19.2 (#288)
- Kimi K3: 74.2 (#16)

| Benchmark | Claude 3.5 Sonnet | Kimi K3 |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 8.5% | 97.2% |
| LMArena Math | 1307 | 1491 |
| FrontierMath (Tiers 1-3) | — | 72.2% |
| FrontierMath Tier 4 | — | 39% |
| MathArena Final-Answer Competitions | — | 87.8% |
| ProofBench | — | 87% |
| Omni-MATH | 27.6% | — |
| LiveBench Math | 52.3% | — |
| MATH Level 5 | 56.9% | — |
| FrontierMath (Feb 2025 set) | 2.1% | — |
| FrontierMath Tier 4 (v1) | 0% | — |

## Knowledge

- Claude 3.5 Sonnet: 28.6 (#245)
- Kimi K3: 63.2 (#21)

| Benchmark | Claude 3.5 Sonnet | Kimi K3 |
|---|---|---|
| GPQA Diamond | 55.3% | 93.1% |
| LMArena Expert | 1265 | 1521 |
| Humanity's Last Exam | 4.1% | — |
| SimpleQA Verified | — | 50.6% |
| MMLU-Pro | 77.7% | — |
| Confabulations | 19.9% | — |
| GPQA (HELM) | 56.5% | — |
| MMLU | 87.3% | — |

## Multimodal

- Claude 3.5 Sonnet: 26.5 (#120)
- Kimi K3: 37.8 (#70)

| Benchmark | Claude 3.5 Sonnet | Kimi K3 |
|---|---|---|
| LMArena Vision | 1125 | — |
| Video-MME | 60% | — |
| GeoBench | 62% | — |
| VPCT | 33% | — |
| Blueprint-Bench 2 | — | 29.5% |
| Furniture Assembly | — | 34.2% |

## Multilingual

- Claude 3.5 Sonnet: 43.2 (#185)
- Kimi K3: 56.3 (#21)

| Benchmark | Claude 3.5 Sonnet | Kimi K3 |
|---|---|---|
| LMArena Non-English | 1283 | 1466 |
| LMArena Chinese | 1272 | 1529 |
| LMArena French | 1305 | 1491 |
| LMArena German | 1297 | 1488 |
| LMArena Japanese | 1234 | 1487 |
| LMArena Korean | 1200 | 1458 |
| LMArena Russian | 1306 | 1482 |
| LMArena Spanish | 1290 | 1472 |

## Instruction Following

- Claude 3.5 Sonnet: 68.8 (#182)
- Kimi K3: 77.7 (#14)

| Benchmark | Claude 3.5 Sonnet | Kimi K3 |
|---|---|---|
| LMArena Instruction Following | 1297 | 1483 |
| LiveBench Instruction Following | 69.3% | — |
| IFEval | 85.5% | — |

## Long Context

- Claude 3.5 Sonnet: 39.9 (#167)
- Kimi K3: 45.8 (#29)

| Benchmark | Claude 3.5 Sonnet | Kimi K3 |
|---|---|---|
| LMArena Longer Query | 1311 | 1494 |

## Writing & Preference

- Claude 3.5 Sonnet: 52.9 (#164)
- Kimi K3: 76.6 (#4)

| Benchmark | Claude 3.5 Sonnet | Kimi K3 |
|---|---|---|
| LMArena Text | 1298 | 1476 |
| LMArena Creative Writing | 1292 | 1454 |
| EQ-Bench Creative Writing | 1451 | 2082 |
| LMArena Multi-Turn | 1326 | 1488 |
| Short-Story Creative Writing | 80.3% | — |
| WildBench | 79.2% | — |
| EQ-Bench 4 | — | 1339 |
| LiveBench Language | 53.8% | — |

## FAQ

### Is Claude 3.5 Sonnet better than Kimi K3?

Kimi K3 is the stronger model overall, scoring 59.5 to 34.6 on the Noometry Index.

### Is Claude 3.5 Sonnet or Kimi K3 better for coding?

Kimi K3 scores higher on coding benchmarks: 61.0 versus 39.0 in the Noometry coding category.

### How many benchmarks do Claude 3.5 Sonnet and Kimi K3 share?

25 benchmarks have published results for both models. Claude 3.5 Sonnet has 60 scored results on Noometry and Kimi K3 has 53.