Model comparison
Kimi K2.5 Instant vs o1-mini
Kimi K2.5 Instant is the stronger model overall, scoring 43.6 to 34.0 on the Noometry Index.
Last verified . 16 shared benchmarks.
Summary
- They share 16 benchmarks with published results for both. Kimi K2.5 Instant scores higher in 8 categories and o1-mini in 0 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Kimi K2.5 Instant leads 29.7 to 8.8.
- Kimi K2.5 Instant has downloadable open weights; the other is API-only.
Side by side
| Kimi K2.5 Instant | o1-mini | |
|---|---|---|
| Provider | Moonshot AI | OpenAI |
| Noometry Index | 43.6 | 34.0 |
| Released | — | 2024-09-12 |
| Weights | Open | Proprietary |
| Context window | — | — |
| Max output | — | — |
| Input $ / M tokens | — | — |
| Output $ / M tokens | — | — |
| Results tracked | 18 | 39 |
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Category by category
Coding Kimi K2.5 Instant leads
Kimi K2.5 Instant: 42.6 (#97), o1-mini: 35.5 (#224)
| Benchmark | Kimi K2.5 Instant | o1-mini |
|---|---|---|
| LMArena Coding | 1484 | 1362 |
| Aider Polyglot | — | 32.9% |
| LMArena WebDev | 1404 | — |
| WeirdML | — | 36.3% |
| LiveBench Coding | — | 48% |
| HumanEval+ | — | 89% |
| MBPP+ | — | 78.8% |
Agentic & Tool Use Not comparable
Kimi K2.5 Instant: —, o1-mini: 24.6 (#118)
| Benchmark | Kimi K2.5 Instant | o1-mini |
|---|---|---|
| Cybench | — | 10% |
Reasoning Kimi K2.5 Instant leads
Kimi K2.5 Instant: 29.7 (#90), o1-mini: 8.8 (#346)
| Benchmark | Kimi K2.5 Instant | o1-mini |
|---|---|---|
| LMArena Hard Prompts | 1443 | 1333 |
| ARC-AGI-2 | — | 0.8% |
| SimpleBench | — | 18.1% |
| ARC-AGI-1 | — | 14% |
| LiveBench Reasoning | — | 72.3% |
| LiveBench Data Analysis | — | 57.9% |
| Epoch Capabilities Index | — | 135.82 |
| LiveBench | — | 57.8% |
Math Kimi K2.5 Instant leads
Kimi K2.5 Instant: 39.4 (#105), o1-mini: 35.4 (#186)
| Benchmark | Kimi K2.5 Instant | o1-mini |
|---|---|---|
| LMArena Math | 1442 | 1358 |
| OTIS Mock AIME 2024-2025 | — | 46.9% |
| LiveBench Math | — | 62% |
| MATH Level 5 | — | 89.2% |
| FrontierMath (Feb 2025 set) | — | 1.7% |
Knowledge Kimi K2.5 Instant leads
Kimi K2.5 Instant: 40.2 (#123), o1-mini: 34.9 (#192)
| Benchmark | Kimi K2.5 Instant | o1-mini |
|---|---|---|
| LMArena Expert | 1440 | 1316 |
| GPQA Diamond | — | 62.4% |
| Confabulations | — | 18.6% |
Multimodal Not comparable
Kimi K2.5 Instant: 40.2 (#50), o1-mini: —
| Benchmark | Kimi K2.5 Instant | o1-mini |
|---|---|---|
| LMArena Vision | 1254 | — |
Multilingual Kimi K2.5 Instant leads
Kimi K2.5 Instant: 52.0 (#94), o1-mini: 43.6 (#182)
| Benchmark | Kimi K2.5 Instant | o1-mini |
|---|---|---|
| LMArena Non-English | 1406 | 1289 |
| LMArena Chinese | 1449 | 1314 |
| LMArena French | 1403 | 1293 |
| LMArena German | 1413 | 1278 |
| LMArena Korean | 1378 | 1223 |
| LMArena Russian | 1404 | 1283 |
| LMArena Spanish | 1447 | 1303 |
| LMArena Japanese | — | 1245 |
Instruction Following Kimi K2.5 Instant leads
Kimi K2.5 Instant: 75.3 (#65), o1-mini: 66.7 (#206)
| Benchmark | Kimi K2.5 Instant | o1-mini |
|---|---|---|
| LMArena Instruction Following | 1430 | 1304 |
| LiveBench Instruction Following | — | 65.4% |
Long Context Kimi K2.5 Instant leads
Kimi K2.5 Instant: 43.9 (#83), o1-mini: 40.1 (#161)
| Benchmark | Kimi K2.5 Instant | o1-mini |
|---|---|---|
| LMArena Longer Query | 1435 | 1320 |
Writing & Preference Kimi K2.5 Instant leads
Kimi K2.5 Instant: 60.6 (#95), o1-mini: 48.4 (#202)
| Benchmark | Kimi K2.5 Instant | o1-mini |
|---|---|---|
| LMArena Text | 1420 | 1317 |
| LMArena Creative Writing | 1381 | 1244 |
| LMArena Multi-Turn | 1427 | 1314 |
| Short-Story Creative Writing | — | 64.9% |
| LiveBench Language | — | 40.9% |
Frequently asked questions
Is Kimi K2.5 Instant better than o1-mini?
Kimi K2.5 Instant is the stronger model overall, scoring 43.6 to 34.0 on the Noometry Index.
Is Kimi K2.5 Instant or o1-mini better for coding?
Kimi K2.5 Instant scores higher on coding benchmarks: 42.6 versus 35.5 in the Noometry coding category.
How many benchmarks do Kimi K2.5 Instant and o1-mini share?
16 benchmarks have published results for both models. Kimi K2.5 Instant has 18 scored results on Noometry and o1-mini has 39.