Model comparison
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.
Last verified . 17 shared benchmarks.
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.
Side by side
| Claude Opus 4 | Kimi K2.5 Instant | |
|---|---|---|
| Provider | Anthropic | Moonshot AI |
| Noometry Index | 43.1 | 43.6 |
| Released | 2025-05-22 | — |
| Weights | Proprietary | Open |
| Context window | 200K | — |
| Max output | 32K | — |
| Input $ / M tokens | $15 | — |
| Output $ / M tokens | $75 | — |
| Results tracked | 56 | 18 |
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Category by category
Coding Claude Opus 4 leads
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 Not comparable
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 Kimi K2.5 Instant leads
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 leads
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 leads
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 Kimi K2.5 Instant leads
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 Kimi K2.5 Instant leads
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 leads
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 Kimi K2.5 Instant leads
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 Too close to call
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% | — |
Frequently asked questions
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.