Model comparison
Claude Opus 4.1 vs Kimi K2.7 Code
Kimi K2.7 Code is the stronger model overall, scoring 43.3 to 41.0 on the Noometry Index.
Last verified . 10 shared benchmarks.
Summary
- They share 10 benchmarks with published results for both. Claude Opus 4.1 scores higher in 2 categories and Kimi K2.7 Code in 3 categories; 5 gaps are clear of the uncertainty.
- The widest gap is in math, where Kimi K2.7 Code leads 52.9 to 22.3.
- The biggest single-benchmark swing is FrontierMath (Tiers 1-3): 12.6% for Claude Opus 4.1 and 54% for Kimi K2.7 Code.
- Kimi K2.7 Code is cheaper at $0.95 / $4 per million input/output tokens, against $15 / $75 for Claude Opus 4.1.
- Kimi K2.7 Code accepts more context: 262K tokens versus 200K.
- Kimi K2.7 Code has downloadable open weights; the other is API-only.
Side by side
| Claude Opus 4.1 | Kimi K2.7 Code | |
|---|---|---|
| Provider | Anthropic | Moonshot AI |
| Noometry Index | 41.0 | 43.3 |
| Released | 2025-08-05 | 2026-06-12 |
| Weights | Proprietary | Open |
| Context window | 200K | 262K |
| Max output | 32K | 262K |
| Input $ / M tokens | $15 | $0.95 |
| Output $ / M tokens | $75 | $4 |
| Results tracked | 48 | 19 |
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Category by category
Coding Claude Opus 4.1 leads
Claude Opus 4.1: 44.4 (#73), Kimi K2.7 Code: 42.9 (#95)
| Benchmark | Claude Opus 4.1 | Kimi K2.7 Code |
|---|---|---|
| LMArena WebDev | 1390 | 1473 |
| WeirdML | 45.9% | 54.1% |
| ALE-Bench | 674.77 | 886.23 |
| SWE-bench Verified | 73.3% | — |
| DeepSWE | — | 30.5% |
| FrontierCode | — | 30.1% |
| SciCode | — | 47.5% |
| LMArena Coding | 1479 | — |
| AlgoTune | 1.34 | — |
Agentic & Tool Use Claude Opus 4.1 leads
Claude Opus 4.1: 35.0 (#41), Kimi K2.7 Code: 24.0 (#122)
| Benchmark | Claude Opus 4.1 | Kimi K2.7 Code |
|---|---|---|
| Terminal-Bench | 38% | — |
| APEX-Agents | — | 37.6% |
| GDPval | 43.6% | — |
| Cybench | 42% | — |
| DeepResearch Bench | 48.3% | — |
| GBAEval | — | 0.9% |
| LMArena Search | 1148 | — |
| METR Time Horizons | 66.8% | — |
| Vending-Bench 2 | — | 5,083 |
Reasoning Kimi K2.7 Code leads
Claude Opus 4.1: 32.2 (#76), Kimi K2.7 Code: 39.0 (#61)
| Benchmark | Claude Opus 4.1 | Kimi K2.7 Code |
|---|---|---|
| SimpleBench | 60% | 57.9% |
| Chess Puzzles | 7% | 21% |
| Epoch Capabilities Index | 144.12 | 149.97 |
| CritPt | — | 10% |
| EnigmaEval | 7.2% | — |
| EBR-Bench | 7.9% | — |
| LMArena Hard Prompts | 1443 | — |
| Mystery Game Puzzles | 21% | — |
| DTBench | 80% | — |
| LMCA | 37.1% | — |
| Surface Evolver Bench | — | 48.8% |
| ForecastBench | 62 | — |
Math Kimi K2.7 Code leads
Claude Opus 4.1: 22.3 (#277), Kimi K2.7 Code: 52.9 (#48)
| Benchmark | Claude Opus 4.1 | Kimi K2.7 Code |
|---|---|---|
| FrontierMath (Tiers 1-3) | 12.6% | 54% |
| FrontierMath Tier 4 | 2.4% | 12.2% |
| OTIS Mock AIME 2024-2025 | 68.9% | 95.6% |
| LMArena Math | 1431 | — |
| FrontierMath (Feb 2025 set) | 7.2% | — |
| FrontierMath Tier 4 (v1) | 4.2% | — |
Knowledge Kimi K2.7 Code leads
Claude Opus 4.1: 42.0 (#101), Kimi K2.7 Code: 53.5 (#57)
| Benchmark | Claude Opus 4.1 | Kimi K2.7 Code |
|---|---|---|
| GPQA Diamond | 77.3% | 87.9% |
| Humanity's Last Exam | 11.5% | — |
| SimpleQA Verified | — | 36.5% |
| Confabulations | 17.1% | — |
| Vectara Hallucination Rate | 11.8% | — |
| LMArena Expert | 1439 | — |
Multimodal Not comparable
Claude Opus 4.1: 26.8 (#119), Kimi K2.7 Code: —
| Benchmark | Claude Opus 4.1 | Kimi K2.7 Code |
|---|---|---|
| VPCT | 35% | — |
Multilingual Not comparable
Claude Opus 4.1: 52.0 (#95), Kimi K2.7 Code: —
| Benchmark | Claude Opus 4.1 | Kimi K2.7 Code |
|---|---|---|
| LMArena Non-English | 1405 | — |
| LMArena Chinese | 1427 | — |
| LMArena French | 1431 | — |
| LMArena German | 1413 | — |
| LMArena Japanese | 1378 | — |
| LMArena Korean | 1380 | — |
| LMArena Russian | 1422 | — |
| LMArena Spanish | 1448 | — |
Instruction Following Not comparable
Claude Opus 4.1: 75.6 (#58), Kimi K2.7 Code: —
| Benchmark | Claude Opus 4.1 | Kimi K2.7 Code |
|---|---|---|
| LMArena Instruction Following | 1435 | — |
Long Context Not comparable
Claude Opus 4.1: 44.5 (#63), Kimi K2.7 Code: —
| Benchmark | Claude Opus 4.1 | Kimi K2.7 Code |
|---|---|---|
| LMArena Longer Query | 1455 | — |
Writing & Preference Not comparable
Claude Opus 4.1: 62.4 (#74), Kimi K2.7 Code: —
| Benchmark | Claude Opus 4.1 | Kimi K2.7 Code |
|---|---|---|
| LMArena Text | 1419 | — |
| LMArena Creative Writing | 1412 | — |
| Short-Story Creative Writing | 84.7% | — |
| LMArena Multi-Turn | 1444 | — |
Frequently asked questions
Is Claude Opus 4.1 better than Kimi K2.7 Code?
Kimi K2.7 Code is the stronger model overall, scoring 43.3 to 41.0 on the Noometry Index.
Which is cheaper, Claude Opus 4.1 or Kimi K2.7 Code?
Kimi K2.7 Code is cheaper. It lists at $0.95 per million input tokens and $4 per million output tokens; Claude Opus 4.1 lists at $15 and $75.
Is Claude Opus 4.1 or Kimi K2.7 Code better for coding?
Claude Opus 4.1 scores higher on coding benchmarks: 44.4 versus 42.9 in the Noometry coding category.
Which has the bigger context window?
Kimi K2.7 Code does, with 262K tokens against 200K.
How many benchmarks do Claude Opus 4.1 and Kimi K2.7 Code share?
10 benchmarks have published results for both models. Claude Opus 4.1 has 48 scored results on Noometry and Kimi K2.7 Code has 19.