Model comparison
Claude Sonnet 4.6 vs Kimi K2.5 Instant
Claude Sonnet 4.6 is the stronger model overall, scoring 50.3 to 43.6 on the Noometry Index.
Last verified . 18 shared benchmarks.
Summary
- They share 18 benchmarks with published results for both. Claude Sonnet 4.6 scores higher in 8 categories and Kimi K2.5 Instant in 1 category; 9 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Claude Sonnet 4.6 leads 46.1 to 29.7.
- Kimi K2.5 Instant has downloadable open weights; the other is API-only.
Side by side
| Claude Sonnet 4.6 | Kimi K2.5 Instant | |
|---|---|---|
| Provider | Anthropic | Moonshot AI |
| Noometry Index | 50.3 | 43.6 |
| Released | 2026-02-17 | — |
| Weights | Proprietary | Open |
| Context window | 1M | — |
| Max output | 128K | — |
| Input $ / M tokens | $3 | — |
| Output $ / M tokens | $15 | — |
| Results tracked | 57 | 18 |
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Category by category
Coding Claude Sonnet 4.6 leads
Claude Sonnet 4.6: 46.3 (#67), Kimi K2.5 Instant: 42.6 (#97)
| Benchmark | Claude Sonnet 4.6 | Kimi K2.5 Instant |
|---|---|---|
| LMArena WebDev | 1522 | 1404 |
| LMArena Coding | 1504 | 1484 |
| SWE-bench Verified | 75.2% | — |
| DeepSWE | 29.9% | — |
| FrontierCode | 24.3% | — |
| SciCode | 46.8% | — |
| WeirdML | 66.1% | — |
| ALE-Bench | 1,327 | — |
Agentic & Tool Use Not comparable
Claude Sonnet 4.6: 39.1 (#28), Kimi K2.5 Instant: —
| Benchmark | Claude Sonnet 4.6 | Kimi K2.5 Instant |
|---|---|---|
| Terminal-Bench | 53.4% | — |
| APEX-Agents | 43% | — |
| OSWorld 2.0 | 9.3% | — |
| DeepResearch Bench | 54.9% | — |
| OSWorld | 72.1% | — |
| ExploitBench | 23.6% | — |
| GBAEval | 48.8% | — |
| GDP.pdf | 18% | — |
| LMArena Search | 1221 | — |
| Vending-Bench 2 | 7,204 | — |
Reasoning Claude Sonnet 4.6 leads
Claude Sonnet 4.6: 46.1 (#45), Kimi K2.5 Instant: 29.7 (#90)
| Benchmark | Claude Sonnet 4.6 | Kimi K2.5 Instant |
|---|---|---|
| LMArena Hard Prompts | 1484 | 1443 |
| ARC-AGI-2 | 60.4% | — |
| NYT Connections (extended) | 80.9% | — |
| ARC-AGI-1 | 86.5% | — |
| CritPt | 3.1% | — |
| Chess Puzzles | 13% | — |
| Thematic Generalization | 76.3% | — |
| Mystery Game Puzzles | 16% | — |
| DTBench | 89.9% | — |
| LMCA | 46.5% | — |
| Epoch Capabilities Index | 152.24 | — |
| ForecastBench | 62 | — |
Math Claude Sonnet 4.6 leads
Claude Sonnet 4.6: 52.9 (#49), Kimi K2.5 Instant: 39.4 (#105)
| Benchmark | Claude Sonnet 4.6 | Kimi K2.5 Instant |
|---|---|---|
| LMArena Math | 1462 | 1442 |
| OTIS Mock AIME 2024-2025 | 85.8% | — |
| ProofBench | 45% | — |
| FrontierMath (Feb 2025 set) | 32.4% | — |
| FrontierMath Tier 4 (v1) | 8.3% | — |
Knowledge Claude Sonnet 4.6 leads
Claude Sonnet 4.6: 51.7 (#65), Kimi K2.5 Instant: 40.2 (#123)
| Benchmark | Claude Sonnet 4.6 | Kimi K2.5 Instant |
|---|---|---|
| LMArena Expert | 1500 | 1440 |
| GPQA Diamond | 87.4% | — |
| SimpleQA Verified | 35.5% | — |
| Vectara Hallucination Rate | 10.6% | — |
Multimodal Kimi K2.5 Instant leads
Claude Sonnet 4.6: 38.0 (#68), Kimi K2.5 Instant: 40.2 (#50)
| Benchmark | Claude Sonnet 4.6 | Kimi K2.5 Instant |
|---|---|---|
| LMArena Vision | 1283 | 1254 |
| Blueprint-Bench 2 | 6.7% | — |
| LMArena Document | 1482 | — |
Multilingual Claude Sonnet 4.6 leads
Claude Sonnet 4.6: 54.4 (#41), Kimi K2.5 Instant: 52.0 (#94)
| Benchmark | Claude Sonnet 4.6 | Kimi K2.5 Instant |
|---|---|---|
| LMArena Non-English | 1440 | 1406 |
| LMArena Chinese | 1491 | 1449 |
| LMArena French | 1465 | 1403 |
| LMArena German | 1428 | 1413 |
| LMArena Korean | 1411 | 1378 |
| LMArena Russian | 1440 | 1404 |
| LMArena Spanish | 1464 | 1447 |
| LMArena Japanese | 1420 | — |
Instruction Following Claude Sonnet 4.6 leads
Claude Sonnet 4.6: 77.4 (#25), Kimi K2.5 Instant: 75.3 (#65)
| Benchmark | Claude Sonnet 4.6 | Kimi K2.5 Instant |
|---|---|---|
| LMArena Instruction Following | 1475 | 1430 |
Long Context Claude Sonnet 4.6 leads
Claude Sonnet 4.6: 45.3 (#44), Kimi K2.5 Instant: 43.9 (#83)
| Benchmark | Claude Sonnet 4.6 | Kimi K2.5 Instant |
|---|---|---|
| LMArena Longer Query | 1479 | 1435 |
Writing & Preference Claude Sonnet 4.6 leads
Claude Sonnet 4.6: 70.2 (#22), Kimi K2.5 Instant: 60.6 (#95)
| Benchmark | Claude Sonnet 4.6 | Kimi K2.5 Instant |
|---|---|---|
| LMArena Text | 1458 | 1420 |
| LMArena Creative Writing | 1435 | 1381 |
| LMArena Multi-Turn | 1464 | 1427 |
| EQ-Bench Creative Writing | 1810 | — |
| EQ-Bench 4 | 1207 | — |
Frequently asked questions
Is Claude Sonnet 4.6 better than Kimi K2.5 Instant?
Claude Sonnet 4.6 is the stronger model overall, scoring 50.3 to 43.6 on the Noometry Index.
Is Claude Sonnet 4.6 or Kimi K2.5 Instant better for coding?
Claude Sonnet 4.6 scores higher on coding benchmarks: 46.3 versus 42.6 in the Noometry coding category.
How many benchmarks do Claude Sonnet 4.6 and Kimi K2.5 Instant share?
18 benchmarks have published results for both models. Claude Sonnet 4.6 has 57 scored results on Noometry and Kimi K2.5 Instant has 18.