Model comparison
Kimi K2.6 vs o3-pro
Kimi K2.6 is the stronger model overall, scoring 47.7 to 42.9 on the Noometry Index.
Last verified . 5 shared benchmarks.
Summary
- They share 5 benchmarks with published results for both. Kimi K2.6 scores higher in 3 categories and o3-pro in 2 categories; 5 gaps are clear of the uncertainty.
- The widest gap is in long context, where o3-pro leads 72.2 to 44.9.
- The biggest single-benchmark swing is Vectara Hallucination Rate: 10.8% for Kimi K2.6 and 23.3% for o3-pro.
- Kimi K2.6 is cheaper at $0.95 / $4 per million input/output tokens, against $20 / $80 for o3-pro.
- Kimi K2.6 accepts more context: 262K tokens versus 200K.
- Kimi K2.6 has downloadable open weights; the other is API-only.
Side by side
| Kimi K2.6 | o3-pro | |
|---|---|---|
| Provider | Moonshot AI | OpenAI |
| Noometry Index | 47.7 | 42.9 |
| Released | 2026-04-20 | 2025-06-10 |
| Weights | Open | Proprietary |
| Context window | 262K | 200K |
| Max output | 262K | 100K |
| Input $ / M tokens | $0.95 | $20 |
| Output $ / M tokens | $4 | $80 |
| Results tracked | 51 | 12 |
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Category by category
Coding o3-pro leads
Kimi K2.6: 50.7 (#43), o3-pro: 55.5 (#24)
| Benchmark | Kimi K2.6 | o3-pro |
|---|---|---|
| WeirdML | 55.9% | 58.2% |
| SWE-bench Verified | 76.7% | — |
| Aider Polyglot | — | 84.9% |
| LMArena WebDev | 1509 | — |
| SciCode | 53.5% | — |
| LMArena Coding | 1488 | — |
| ALE-Bench | 1,093 | — |
Agentic & Tool Use Not comparable
Kimi K2.6: 21.9 (#137), o3-pro: —
| Benchmark | Kimi K2.6 | o3-pro |
|---|---|---|
| OSWorld 2.0 | 4.6% | — |
| ExploitBench | 18.4% | — |
| GBAEval | 0.9% | — |
| GDP.pdf | 12% | — |
| Vending-Bench 2 | 6,205 | — |
Reasoning Kimi K2.6 leads
Kimi K2.6: 40.5 (#55), o3-pro: 23.8 (#171)
| Benchmark | Kimi K2.6 | o3-pro |
|---|---|---|
| DTBench | 90.9% | 86.9% |
| LMCA | 37.3% | 38.5% |
| Epoch Capabilities Index | 151.05 | 147.42 |
| ARC-AGI-2 | — | 4.9% |
| Kagi LLM Benchmark | — | 72.1% |
| NYT Connections (extended) | 87.2% | — |
| ARC-AGI-1 | — | 59.3% |
| CritPt | 8% | — |
| Chess Puzzles | 26% | — |
| EBR-Bench | 2.4% | — |
| LMArena Hard Prompts | 1470 | — |
| Mystery Game Puzzles | 18% | — |
Math Not comparable
Kimi K2.6: 57.0 (#41), o3-pro: —
| Benchmark | Kimi K2.6 | o3-pro |
|---|---|---|
| FrontierMath (Tiers 1-3) | 57.2% | — |
| FrontierMath Tier 4 | 25.6% | — |
| MathArena Final-Answer Competitions | 72.9% | — |
| OTIS Mock AIME 2024-2025 | 96.1% | — |
| ProofBench | 16% | — |
| LMArena Math | 1475 | — |
| FrontierMath (Feb 2025 set) | 39% | — |
| FrontierMath Tier 4 (v1) | 14.6% | — |
Knowledge Kimi K2.6 leads
Kimi K2.6: 54.0 (#54), o3-pro: 29.5 (#238)
| Benchmark | Kimi K2.6 | o3-pro |
|---|---|---|
| Vectara Hallucination Rate | 10.8% | 23.3% |
| GPQA Diamond | 90.8% | — |
| SimpleQA Verified | 34.9% | — |
| Confabulations | — | 14.2% |
| LMArena Expert | 1491 | — |
Multimodal Not comparable
Kimi K2.6: 31.6 (#103), o3-pro: —
| Benchmark | Kimi K2.6 | o3-pro |
|---|---|---|
| LMArena Vision | 1283 | — |
| Blueprint-Bench 2 | 3.9% | — |
| Furniture Assembly | 21.7% | — |
| LMArena Document | 1451 | — |
Multilingual Not comparable
Kimi K2.6: 54.9 (#37), o3-pro: —
| Benchmark | Kimi K2.6 | o3-pro |
|---|---|---|
| LMArena Non-English | 1446 | — |
| LMArena Chinese | 1521 | — |
| LMArena French | 1471 | — |
| LMArena German | 1450 | — |
| LMArena Japanese | 1443 | — |
| LMArena Korean | 1427 | — |
| LMArena Russian | 1446 | — |
| LMArena Spanish | 1464 | — |
Instruction Following Not comparable
Kimi K2.6: 76.3 (#43), o3-pro: —
| Benchmark | Kimi K2.6 | o3-pro |
|---|---|---|
| LMArena Instruction Following | 1451 | — |
Long Context o3-pro leads
Kimi K2.6: 44.9 (#52), o3-pro: 72.2 (#1)
| Benchmark | Kimi K2.6 | o3-pro |
|---|---|---|
| Fiction.LiveBench | — | 97.2% |
| LMArena Longer Query | 1468 | — |
Writing & Preference Kimi K2.6 leads
Kimi K2.6: 68.5 (#26), o3-pro: 57.1 (#133)
| Benchmark | Kimi K2.6 | o3-pro |
|---|---|---|
| LMArena Text | 1455 | — |
| LMArena Creative Writing | 1434 | — |
| Short-Story Creative Writing | — | 84.4% |
| EQ-Bench Creative Writing | 1725 | — |
| EQ-Bench 4 | 1202 | — |
| LMArena Multi-Turn | 1453 | — |
Frequently asked questions
Is Kimi K2.6 better than o3-pro?
Kimi K2.6 is the stronger model overall, scoring 47.7 to 42.9 on the Noometry Index.
Which is cheaper, Kimi K2.6 or o3-pro?
Kimi K2.6 is cheaper. It lists at $0.95 per million input tokens and $4 per million output tokens; o3-pro lists at $20 and $80.
Is Kimi K2.6 or o3-pro better for coding?
o3-pro scores higher on coding benchmarks: 55.5 versus 50.7 in the Noometry coding category.
Which has the bigger context window?
Kimi K2.6 does, with 262K tokens against 200K.
How many benchmarks do Kimi K2.6 and o3-pro share?
5 benchmarks have published results for both models. Kimi K2.6 has 51 scored results on Noometry and o3-pro has 12.