Model comparison
Kimi K2 (Jul 2025) vs o1-mini
Kimi K2 (Jul 2025) is the stronger model overall, scoring 41.2 to 34.0 on the Noometry Index.
Last verified . 24 shared benchmarks.
Summary
- They share 24 benchmarks with published results for both. Kimi K2 (Jul 2025) scores higher in 9 categories and o1-mini in 0 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Kimi K2 (Jul 2025) leads 23.3 to 8.8.
- The biggest single-benchmark swing is Aider Polyglot: 59.1% for Kimi K2 (Jul 2025) and 32.9% for o1-mini.
- Kimi K2 (Jul 2025) has downloadable open weights; the other is API-only.
Side by side
| Kimi K2 (Jul 2025) | o1-mini | |
|---|---|---|
| Provider | Moonshot AI | OpenAI |
| Noometry Index | 41.2 | 34.0 |
| Released | 2025-07-12 | 2024-09-12 |
| Weights | Open | Proprietary |
| Context window | 262K | — |
| Max output | 262K | — |
| Input $ / M tokens | $0.57 | — |
| Output $ / M tokens | $2.30 | — |
| Results tracked | 42 | 39 |
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Category by category
Coding Kimi K2 (Jul 2025) leads
Kimi K2 (Jul 2025): 42.4 (#102), o1-mini: 35.5 (#224)
| Benchmark | Kimi K2 (Jul 2025) | o1-mini |
|---|---|---|
| Aider Polyglot | 59.1% | 32.9% |
| WeirdML | 42.8% | 36.3% |
| LMArena Coding | 1399 | 1362 |
| SWE-bench Verified (bash only) | 63.4% | — |
| GSO | 4.9% | — |
| LiveBench Coding | — | 48% |
| ALE-Bench | 597.5 | — |
| HumanEval+ | — | 89% |
| MBPP+ | — | 78.8% |
Agentic & Tool Use Kimi K2 (Jul 2025) leads
Kimi K2 (Jul 2025): 32.4 (#64), o1-mini: 24.6 (#118)
| Benchmark | Kimi K2 (Jul 2025) | o1-mini |
|---|---|---|
| Terminal-Bench | 35.7% | — |
| Berkeley Function Calling Leaderboard | 59.1% | — |
| Cybench | — | 10% |
| METR Time Horizons | 59.2% | — |
Reasoning Kimi K2 (Jul 2025) leads
Kimi K2 (Jul 2025): 23.3 (#179), o1-mini: 8.8 (#346)
| Benchmark | Kimi K2 (Jul 2025) | o1-mini |
|---|---|---|
| SimpleBench | 26.3% | 18.1% |
| LMArena Hard Prompts | 1384 | 1333 |
| Epoch Capabilities Index | 146.01 | 135.82 |
| ARC-AGI-2 | — | 0.8% |
| Kagi LLM Benchmark | 64.4% | — |
| ARC-AGI-1 | — | 14% |
| LiveBench Reasoning | — | 72.3% |
| LiveBench Data Analysis | — | 57.9% |
| ForecastBench | 60.2 | — |
| LiveBench | — | 57.8% |
Math Kimi K2 (Jul 2025) leads
Kimi K2 (Jul 2025): 42.7 (#83), o1-mini: 35.4 (#186)
| Benchmark | Kimi K2 (Jul 2025) | o1-mini |
|---|---|---|
| LMArena Math | 1397 | 1358 |
| FrontierMath (Feb 2025 set) | 21.4% | 1.7% |
| OTIS Mock AIME 2024-2025 | — | 46.9% |
| Omni-MATH | 65.4% | — |
| LiveBench Math | — | 62% |
| MATH Level 5 | — | 89.2% |
| FrontierMath Tier 4 (v1) | 0% | — |
Knowledge Kimi K2 (Jul 2025) leads
Kimi K2 (Jul 2025): 37.3 (#157), o1-mini: 34.9 (#192)
| Benchmark | Kimi K2 (Jul 2025) | o1-mini |
|---|---|---|
| Confabulations | 20.4% | 18.6% |
| LMArena Expert | 1365 | 1316 |
| GPQA Diamond | — | 62.4% |
| MMLU-Pro | 81.9% | — |
| Vectara Hallucination Rate | 17.9% | — |
| GPQA (HELM) | 65.3% | — |
Multilingual Kimi K2 (Jul 2025) leads
Kimi K2 (Jul 2025): 49.6 (#130), o1-mini: 43.6 (#182)
| Benchmark | Kimi K2 (Jul 2025) | o1-mini |
|---|---|---|
| LMArena Non-English | 1372 | 1289 |
| LMArena Chinese | 1415 | 1314 |
| LMArena French | 1379 | 1293 |
| LMArena German | 1387 | 1278 |
| LMArena Japanese | 1349 | 1245 |
| LMArena Korean | 1325 | 1223 |
| LMArena Russian | 1385 | 1283 |
| LMArena Spanish | 1386 | 1303 |
Instruction Following Kimi K2 (Jul 2025) leads
Kimi K2 (Jul 2025): 71.1 (#156), o1-mini: 66.7 (#206)
| Benchmark | Kimi K2 (Jul 2025) | o1-mini |
|---|---|---|
| LMArena Instruction Following | 1348 | 1304 |
| LiveBench Instruction Following | — | 65.4% |
| IFEval | 85% | — |
Long Context Kimi K2 (Jul 2025) leads
Kimi K2 (Jul 2025): 41.2 (#145), o1-mini: 40.1 (#161)
| Benchmark | Kimi K2 (Jul 2025) | o1-mini |
|---|---|---|
| LMArena Longer Query | 1353 | 1320 |
| Fiction.LiveBench | 66.7% | — |
| CL-bench | 17.6% | — |
Writing & Preference Kimi K2 (Jul 2025) leads
Kimi K2 (Jul 2025): 62.3 (#78), o1-mini: 48.4 (#202)
| Benchmark | Kimi K2 (Jul 2025) | o1-mini |
|---|---|---|
| LMArena Text | 1380 | 1317 |
| LMArena Creative Writing | 1350 | 1244 |
| Short-Story Creative Writing | 85.6% | 64.9% |
| LMArena Multi-Turn | 1371 | 1314 |
| EQ-Bench Creative Writing | 1666 | — |
| WildBench | 86.2% | — |
| LiveBench Language | — | 40.9% |
Frequently asked questions
Is Kimi K2 (Jul 2025) better than o1-mini?
Kimi K2 (Jul 2025) is the stronger model overall, scoring 41.2 to 34.0 on the Noometry Index.
Is Kimi K2 (Jul 2025) or o1-mini better for coding?
Kimi K2 (Jul 2025) scores higher on coding benchmarks: 42.4 versus 35.5 in the Noometry coding category.
How many benchmarks do Kimi K2 (Jul 2025) and o1-mini share?
24 benchmarks have published results for both models. Kimi K2 (Jul 2025) has 42 scored results on Noometry and o1-mini has 39.