Model comparison
Kimi K2.5 Instant vs o3
o3 is the stronger model overall, scoring 47.5 to 43.6 on the Noometry Index.
Last verified . 17 shared benchmarks.
Summary
- They share 17 benchmarks with published results for both. Kimi K2.5 Instant scores higher in 2 categories and o3 in 7 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where o3 leads 54.6 to 40.2.
- Kimi K2.5 Instant has downloadable open weights; the other is API-only.
Side by side
| Kimi K2.5 Instant | o3 | |
|---|---|---|
| Provider | Moonshot AI | OpenAI |
| Noometry Index | 43.6 | 47.5 |
| Released | — | 2025-04-16 |
| Weights | Open | Proprietary |
| Context window | — | 200K |
| Max output | — | 100K |
| Input $ / M tokens | — | $2 |
| Output $ / M tokens | — | $8 |
| Results tracked | 18 | 63 |
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Category by category
Coding o3 leads
Kimi K2.5 Instant: 42.6 (#97), o3: 46.8 (#64)
| Benchmark | Kimi K2.5 Instant | o3 |
|---|---|---|
| LMArena Coding | 1484 | 1408 |
| SWE-bench Verified | — | 62.3% |
| SWE-bench Verified (bash only) | — | 58.4% |
| Aider Polyglot | — | 81.3% |
| LMArena WebDev | 1404 | — |
| GSO | — | 8.8% |
| WeirdML | — | 52.4% |
| CadEval | — | 74% |
| ALE-Bench | — | 933.55 |
Agentic & Tool Use Not comparable
Kimi K2.5 Instant: —, o3: 34.5 (#44)
| Benchmark | Kimi K2.5 Instant | o3 |
|---|---|---|
| Berkeley Function Calling Leaderboard | — | 63% |
| GDPval | — | 30.8% |
| DeepResearch Bench | — | 45.2% |
| OSWorld | — | 23% |
| LMArena Search | — | 1144 |
| METR Time Horizons | — | 65.4% |
Reasoning o3 leads
Kimi K2.5 Instant: 29.7 (#90), o3: 32.0 (#78)
| Benchmark | Kimi K2.5 Instant | o3 |
|---|---|---|
| LMArena Hard Prompts | 1443 | 1402 |
| ARC-AGI-2 | — | 6.5% |
| SimpleBench | — | 53.1% |
| Kagi LLM Benchmark | — | 67.6% |
| ARC-AGI-1 | — | 60.8% |
| CritPt | — | 1.4% |
| Chess Puzzles | — | 38% |
| EnigmaEval | — | 13.1% |
| Mystery Game Puzzles | — | 29% |
| DTBench | — | 84.8% |
| LMCA | — | 39.7% |
| Epoch Capabilities Index | — | 146.86 |
| ForecastBench | — | 62.5 |
Math o3 leads
Kimi K2.5 Instant: 39.4 (#105), o3: 50.2 (#58)
| Benchmark | Kimi K2.5 Instant | o3 |
|---|---|---|
| LMArena Math | 1442 | 1426 |
| FrontierMath (Tiers 1-3) | — | 33.3% |
| OTIS Mock AIME 2024-2025 | — | 84.4% |
| Omni-MATH | — | 71.4% |
| MATH Level 5 | — | 97.8% |
| FrontierMath (Feb 2025 set) | — | 18.7% |
| FrontierMath Tier 4 (v1) | — | 2.1% |
Knowledge o3 leads
Kimi K2.5 Instant: 40.2 (#123), o3: 54.6 (#52)
| Benchmark | Kimi K2.5 Instant | o3 |
|---|---|---|
| LMArena Expert | 1440 | 1402 |
| GPQA Diamond | — | 81.8% |
| Humanity's Last Exam | — | 20.3% |
| SimpleQA Verified | — | 49.4% |
| MMLU-Pro | — | 85.9% |
| Confabulations | — | 14.4% |
| GPQA (HELM) | — | 75.3% |
Multimodal o3 leads
Kimi K2.5 Instant: 40.2 (#50), o3: 41.4 (#36)
| Benchmark | Kimi K2.5 Instant | o3 |
|---|---|---|
| LMArena Vision | 1254 | 1214 |
| GeoBench | — | 74% |
| VPCT | — | 52% |
Multilingual Too close to call
Kimi K2.5 Instant: 52.0 (#94), o3: 51.7 (#105)
| Benchmark | Kimi K2.5 Instant | o3 |
|---|---|---|
| LMArena Non-English | 1406 | 1401 |
| LMArena Chinese | 1449 | 1437 |
| LMArena French | 1403 | 1430 |
| LMArena German | 1413 | 1420 |
| LMArena Korean | 1378 | 1370 |
| LMArena Russian | 1404 | 1406 |
| LMArena Spanish | 1447 | 1395 |
| LMArena Japanese | — | 1403 |
Instruction Following Kimi K2.5 Instant leads
Kimi K2.5 Instant: 75.3 (#65), o3: 72.8 (#127)
| Benchmark | Kimi K2.5 Instant | o3 |
|---|---|---|
| LMArena Instruction Following | 1430 | 1368 |
| IFEval | — | 86.9% |
Long Context o3 leads
Kimi K2.5 Instant: 43.9 (#83), o3: 53.3 (#6)
| Benchmark | Kimi K2.5 Instant | o3 |
|---|---|---|
| LMArena Longer Query | 1435 | 1372 |
| Fiction.LiveBench | — | 88.9% |
| CL-bench | — | 17.8% |
Writing & Preference o3 leads
Kimi K2.5 Instant: 60.6 (#95), o3: 63.5 (#64)
| Benchmark | Kimi K2.5 Instant | o3 |
|---|---|---|
| LMArena Text | 1420 | 1410 |
| LMArena Creative Writing | 1381 | 1359 |
| LMArena Multi-Turn | 1427 | 1405 |
| Short-Story Creative Writing | — | 83.9% |
| EQ-Bench Creative Writing | — | 1676 |
| WildBench | — | 86.1% |
Frequently asked questions
Is Kimi K2.5 Instant better than o3?
o3 is the stronger model overall, scoring 47.5 to 43.6 on the Noometry Index.
Is Kimi K2.5 Instant or o3 better for coding?
o3 scores higher on coding benchmarks: 46.8 versus 42.6 in the Noometry coding category.
How many benchmarks do Kimi K2.5 Instant and o3 share?
17 benchmarks have published results for both models. Kimi K2.5 Instant has 18 scored results on Noometry and o3 has 63.