Model comparison
Kimi K2.5 vs o1-mini
Kimi K2.5 is the stronger model overall, scoring 48.1 to 34.0 on the Noometry Index.
Last verified . 25 shared benchmarks.
Summary
- They share 25 benchmarks with published results for both. Kimi K2.5 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 K2.5 leads 31.2 to 8.8.
- The biggest single-benchmark swing is ARC-AGI-1: 65.3% for Kimi K2.5 and 14% for o1-mini.
- Kimi K2.5 has downloadable open weights; the other is API-only.
Side by side
| Kimi K2.5 | o1-mini | |
|---|---|---|
| Provider | Moonshot AI | OpenAI |
| Noometry Index | 48.1 | 34.0 |
| Released | 2026-01-27 | 2024-09-12 |
| Weights | Open | Proprietary |
| Context window | 262K | — |
| Max output | 262K | — |
| Input $ / M tokens | $0.45 | — |
| Output $ / M tokens | $2.25 | — |
| Results tracked | 51 | 39 |
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Category by category
Coding Kimi K2.5 leads
Kimi K2.5: 48.8 (#53), o1-mini: 35.5 (#224)
| Benchmark | Kimi K2.5 | o1-mini |
|---|---|---|
| WeirdML | 45.6% | 36.3% |
| LMArena Coding | 1474 | 1362 |
| SWE-bench Verified | 73.8% | — |
| SWE-bench Verified (bash only) | 70.8% | — |
| Aider Polyglot | — | 32.9% |
| LMArena WebDev | 1437 | — |
| SWE-bench Multilingual | 67.3% | — |
| SciCode | 49% | — |
| LiveBench Coding | — | 48% |
| ALE-Bench | 821.65 | — |
| HumanEval+ | — | 89% |
| MBPP+ | — | 78.8% |
Agentic & Tool Use Kimi K2.5 leads
Kimi K2.5: 34.2 (#48), o1-mini: 24.6 (#118)
| Benchmark | Kimi K2.5 | o1-mini |
|---|---|---|
| Terminal-Bench | 43.2% | — |
| Cybench | — | 10% |
| OSWorld | 63.3% | — |
| Vending-Bench 2 | 1,198 | — |
Reasoning Kimi K2.5 leads
Kimi K2.5: 31.2 (#80), o1-mini: 8.8 (#346)
| Benchmark | Kimi K2.5 | o1-mini |
|---|---|---|
| ARC-AGI-2 | 11.8% | 0.8% |
| SimpleBench | 46.8% | 18.1% |
| ARC-AGI-1 | 65.3% | 14% |
| LMArena Hard Prompts | 1453 | 1333 |
| Epoch Capabilities Index | 148.03 | 135.82 |
| Kagi LLM Benchmark | 78.5% | — |
| NYT Connections (extended) | 69.9% | — |
| CritPt | 3.1% | — |
| Chess Puzzles | 12% | — |
| EnigmaEval | 3.4% | — |
| Thematic Generalization | 69.4% | — |
| LiveBench Reasoning | — | 72.3% |
| LiveBench Data Analysis | — | 57.9% |
| LiveBench | — | 57.8% |
Math Kimi K2.5 leads
Kimi K2.5: 51.8 (#53), o1-mini: 35.4 (#186)
| Benchmark | Kimi K2.5 | o1-mini |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 92.2% | 46.9% |
| LMArena Math | 1470 | 1358 |
| FrontierMath (Feb 2025 set) | 27.9% | 1.7% |
| MathArena Final-Answer Competitions | 62.3% | — |
| LiveBench Math | — | 62% |
| MATH Level 5 | — | 89.2% |
| FrontierMath Tier 4 (v1) | 4.2% | — |
Knowledge Kimi K2.5 leads
Kimi K2.5: 53.6 (#56), o1-mini: 34.9 (#192)
| Benchmark | Kimi K2.5 | o1-mini |
|---|---|---|
| GPQA Diamond | 87.6% | 62.4% |
| LMArena Expert | 1466 | 1316 |
| Humanity's Last Exam | 24.4% | — |
| SimpleQA Verified | 34.3% | — |
| Confabulations | — | 18.6% |
| Vectara Hallucination Rate | 14.2% | — |
Multimodal Not comparable
Kimi K2.5: 41.1 (#39), o1-mini: —
| Benchmark | Kimi K2.5 | o1-mini |
|---|---|---|
| LMArena Vision | 1269 | — |
| LMArena Document | 1430 | — |
Multilingual Kimi K2.5 leads
Kimi K2.5: 53.9 (#53), o1-mini: 43.6 (#182)
| Benchmark | Kimi K2.5 | o1-mini |
|---|---|---|
| LMArena Non-English | 1433 | 1289 |
| LMArena Chinese | 1495 | 1314 |
| LMArena French | 1454 | 1293 |
| LMArena German | 1441 | 1278 |
| LMArena Japanese | 1421 | 1245 |
| LMArena Korean | 1410 | 1223 |
| LMArena Russian | 1435 | 1283 |
| LMArena Spanish | 1450 | 1303 |
Instruction Following Kimi K2.5 leads
Kimi K2.5: 75.3 (#64), o1-mini: 66.7 (#206)
| Benchmark | Kimi K2.5 | o1-mini |
|---|---|---|
| LMArena Instruction Following | 1431 | 1304 |
| LiveBench Instruction Following | — | 65.4% |
Long Context Kimi K2.5 leads
Kimi K2.5: 52.1 (#7), o1-mini: 40.1 (#161)
| Benchmark | Kimi K2.5 | o1-mini |
|---|---|---|
| LMArena Longer Query | 1445 | 1320 |
| Fiction.LiveBench | 86.1% | — |
| CL-bench | 19.3% | — |
| CL-bench Life | 13.2% | — |
Writing & Preference Kimi K2.5 leads
Kimi K2.5: 65.1 (#53), o1-mini: 48.4 (#202)
| Benchmark | Kimi K2.5 | o1-mini |
|---|---|---|
| LMArena Text | 1445 | 1317 |
| LMArena Creative Writing | 1423 | 1244 |
| LMArena Multi-Turn | 1444 | 1314 |
| Short-Story Creative Writing | — | 64.9% |
| EQ-Bench Creative Writing | 1579 | — |
| LiveBench Language | — | 40.9% |
Frequently asked questions
Is Kimi K2.5 better than o1-mini?
Kimi K2.5 is the stronger model overall, scoring 48.1 to 34.0 on the Noometry Index.
Is Kimi K2.5 or o1-mini better for coding?
Kimi K2.5 scores higher on coding benchmarks: 48.8 versus 35.5 in the Noometry coding category.
How many benchmarks do Kimi K2.5 and o1-mini share?
25 benchmarks have published results for both models. Kimi K2.5 has 51 scored results on Noometry and o1-mini has 39.