Model comparison
Claude 3 Sonnet vs Kimi K2 (Jul 2025)
Kimi K2 (Jul 2025) is the stronger model overall, scoring 40.9 to 28.8 on the Noometry Index.
Last verified . 19 shared benchmarks.
Summary
- They share 19 benchmarks with published results for both. Claude 3 Sonnet scores higher in 0 categories and Kimi K2 (Jul 2025) in 8 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in math, where Kimi K2 (Jul 2025) leads 40.1 to 10.0.
- The biggest single-benchmark swing is WeirdML: 10.2% for Claude 3 Sonnet and 42.8% for Kimi K2 (Jul 2025).
- Kimi K2 (Jul 2025) has downloadable open weights; the other is API-only.
Side by side
| Claude 3 Sonnet | Kimi K2 (Jul 2025) | |
|---|---|---|
| Provider | Anthropic | Moonshot AI |
| Noometry Index | 28.8 | 40.9 |
| Released | 2024-02-29 | 2025-07-12 |
| Weights | Proprietary | Open |
| Context window | — | 262K |
| Max output | — | 262K |
| Input $ / M tokens | — | $0.57 |
| Output $ / M tokens | — | $2.30 |
| Results tracked | 30 | 42 |
Sponsored placements are available on pages like this one. Advertise on Noometry
Category by category
Coding Kimi K2 (Jul 2025) leads
Claude 3 Sonnet: 29.2 (#296), Kimi K2 (Jul 2025): 43.1 (#83)
| Benchmark | Claude 3 Sonnet | Kimi K2 (Jul 2025) |
|---|---|---|
| WeirdML | 10.2% | 42.8% |
| LMArena Coding | 1223 | 1399 |
| SWE-bench Verified (bash only) | — | 63.4% |
| Aider Polyglot | — | 59.1% |
| GSO | — | 4.9% |
| BigCodeBench Instruct | 42.7% | — |
| BigCodeBench Complete | 53.8% | — |
| ALE-Bench | — | 597.5 |
| HumanEval+ | 64% | — |
| MBPP+ | 69.3% | — |
Agentic & Tool Use Not comparable
Claude 3 Sonnet: —, Kimi K2 (Jul 2025): 32.2 (#59)
| Benchmark | Claude 3 Sonnet | Kimi K2 (Jul 2025) |
|---|---|---|
| Terminal-Bench | — | 35.7% |
| Berkeley Function Calling Leaderboard | — | 59.1% |
| METR Time Horizons | — | 59.2% |
Reasoning Kimi K2 (Jul 2025) leads
Claude 3 Sonnet: 19.7 (#232), Kimi K2 (Jul 2025): 22.7 (#173)
| Benchmark | Claude 3 Sonnet | Kimi K2 (Jul 2025) |
|---|---|---|
| LMArena Hard Prompts | 1197 | 1384 |
| Epoch Capabilities Index | 120.69 | 146.02 |
| SimpleBench | — | 26.3% |
| Kagi LLM Benchmark | — | 64.4% |
| DTBench | 53.6% | — |
| ForecastBench | — | 60.2 |
| WinoGrande | 75.1% | — |
Math Kimi K2 (Jul 2025) leads
Claude 3 Sonnet: 10.0 (#305), Kimi K2 (Jul 2025): 40.1 (#81)
| Benchmark | Claude 3 Sonnet | Kimi K2 (Jul 2025) |
|---|---|---|
| LMArena Math | 1213 | 1396 |
| OTIS Mock AIME 2024-2025 | 2.5% | — |
| Omni-MATH | — | 65.4% |
| MATH Level 5 | 18.2% | — |
| FrontierMath (Feb 2025 set) | — | 21.4% |
| FrontierMath Tier 4 (v1) | — | 0% |
Knowledge Kimi K2 (Jul 2025) leads
Claude 3 Sonnet: 21.1 (#271), Kimi K2 (Jul 2025): 36.9 (#153)
| Benchmark | Claude 3 Sonnet | Kimi K2 (Jul 2025) |
|---|---|---|
| LMArena Expert | 1173 | 1363 |
| GPQA Diamond | 40.6% | — |
| MMLU-Pro | — | 81.9% |
| Confabulations | — | 20.4% |
| Vectara Hallucination Rate | — | 17.9% |
| GPQA (HELM) | — | 65.3% |
| MMLU | 75.9% | — |
Multimodal Not comparable
Claude 3 Sonnet: 24.7 (#120), Kimi K2 (Jul 2025): —
| Benchmark | Claude 3 Sonnet | Kimi K2 (Jul 2025) |
|---|---|---|
| LMArena Vision | 984 | — |
Multilingual Kimi K2 (Jul 2025) leads
Claude 3 Sonnet: 38.0 (#229), Kimi K2 (Jul 2025): 49.8 (#125)
| Benchmark | Claude 3 Sonnet | Kimi K2 (Jul 2025) |
|---|---|---|
| LMArena Non-English | 1205 | 1372 |
| LMArena Chinese | 1188 | 1416 |
| LMArena French | 1228 | 1379 |
| LMArena German | 1204 | 1386 |
| LMArena Japanese | 1131 | 1349 |
| LMArena Korean | 1128 | 1324 |
| LMArena Russian | 1227 | 1384 |
| LMArena Spanish | 1204 | 1383 |
Instruction Following Kimi K2 (Jul 2025) leads
Claude 3 Sonnet: 63.1 (#230), Kimi K2 (Jul 2025): 71.3 (#151)
| Benchmark | Claude 3 Sonnet | Kimi K2 (Jul 2025) |
|---|---|---|
| LMArena Instruction Following | 1200 | 1347 |
| IFEval | — | 85% |
Long Context Kimi K2 (Jul 2025) leads
Claude 3 Sonnet: 36.7 (#223), Kimi K2 (Jul 2025): 41.2 (#140)
| Benchmark | Claude 3 Sonnet | Kimi K2 (Jul 2025) |
|---|---|---|
| LMArena Longer Query | 1211 | 1353 |
| Fiction.LiveBench | — | 66.7% |
| CL-bench | — | 17.6% |
Writing & Preference Kimi K2 (Jul 2025) leads
Claude 3 Sonnet: 42.3 (#233), Kimi K2 (Jul 2025): 62.5 (#76)
| Benchmark | Claude 3 Sonnet | Kimi K2 (Jul 2025) |
|---|---|---|
| LMArena Text | 1218 | 1380 |
| LMArena Creative Writing | 1186 | 1349 |
| LMArena Multi-Turn | 1227 | 1371 |
| Short-Story Creative Writing | — | 85.6% |
| EQ-Bench Creative Writing | — | 1666 |
| WildBench | — | 86.2% |
Frequently asked questions
Is Claude 3 Sonnet better than Kimi K2 (Jul 2025)?
Kimi K2 (Jul 2025) is the stronger model overall, scoring 40.9 to 28.8 on the Noometry Index.
Is Claude 3 Sonnet or Kimi K2 (Jul 2025) better for coding?
Kimi K2 (Jul 2025) scores higher on coding benchmarks: 43.1 versus 29.2 in the Noometry coding category.
How many benchmarks do Claude 3 Sonnet and Kimi K2 (Jul 2025) share?
19 benchmarks have published results for both models. Claude 3 Sonnet has 30 scored results on Noometry and Kimi K2 (Jul 2025) has 42.