Model comparison
Kimi K3 vs o3-pro
Kimi K3 is the stronger model overall, scoring 59.5 to 42.9 on the Noometry Index.
Last verified . 6 shared benchmarks.
Summary
- They share 6 benchmarks with published results for both. Kimi K3 scores higher in 4 categories and o3-pro in 1 category; 5 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Kimi K3 leads 63.0 to 23.8.
- The biggest single-benchmark swing is ARC-AGI-2: 60.4% for Kimi K3 and 4.9% for o3-pro.
- Kimi K3 is cheaper at $3 / $15 per million input/output tokens, against $20 / $80 for o3-pro.
- Kimi K3 accepts more context: 1.05M tokens versus 200K.
- Kimi K3 has downloadable open weights; the other is API-only.
Side by side
| Kimi K3 | o3-pro | |
|---|---|---|
| Provider | Moonshot AI | OpenAI |
| Noometry Index | 59.5 | 42.9 |
| Released | 2026-07-16 | 2025-06-10 |
| Weights | Open | Proprietary |
| Context window | 1.05M | 200K |
| Max output | 1.05M | 100K |
| Input $ / M tokens | $3 | $20 |
| Output $ / M tokens | $15 | $80 |
| Results tracked | 53 | 12 |
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Category by category
Coding Kimi K3 leads
Kimi K3: 61.0 (#10), o3-pro: 55.5 (#24)
| Benchmark | Kimi K3 | o3-pro |
|---|---|---|
| WeirdML | 82.6% | 58.2% |
| DeepSWE | 68.5% | — |
| FrontierCode | 44.2% | — |
| Aider Polyglot | — | 84.9% |
| LMArena WebDev | 1654 | — |
| FrontierSWE | 25.9% | — |
| SciCode | 59.5% | — |
| LMArena Coding | 1508 | — |
| ALE-Bench | 1,524 | — |
Agentic & Tool Use Not comparable
Kimi K3: 41.8 (#20), o3-pro: —
| Benchmark | Kimi K3 | o3-pro |
|---|---|---|
| APEX-Agents | 50.6% | — |
| τ²-bench Banking | 37.1% | — |
| PostTrainBench | 32% | — |
| GBAEval | 48.3% | — |
| GDP.pdf | 19% | — |
| Vending-Bench 2 | 5,165 | — |
Reasoning Kimi K3 leads
Kimi K3: 63.0 (#17), o3-pro: 23.8 (#171)
| Benchmark | Kimi K3 | o3-pro |
|---|---|---|
| ARC-AGI-2 | 60.4% | 4.9% |
| ARC-AGI-1 | 94.5% | 59.3% |
| DTBench | 91.2% | 86.9% |
| LMCA | 52.7% | 38.5% |
| Epoch Capabilities Index | 157.45 | 147.42 |
| SimpleBench | 60.7% | — |
| Kagi LLM Benchmark | — | 72.1% |
| NYT Connections (extended) | 93.6% | — |
| CritPt | 23.4% | — |
| Chess Puzzles | 39% | — |
| LMArena Hard Prompts | 1496 | — |
| Mystery Game Puzzles | 26% | — |
| Surface Evolver Bench | 95% | — |
| ForecastBench | 61.1 | — |
Math Not comparable
Kimi K3: 74.2 (#16), o3-pro: —
| Benchmark | Kimi K3 | o3-pro |
|---|---|---|
| FrontierMath (Tiers 1-3) | 72.2% | — |
| FrontierMath Tier 4 | 39% | — |
| MathArena Final-Answer Competitions | 87.8% | — |
| OTIS Mock AIME 2024-2025 | 97.2% | — |
| ProofBench | 87% | — |
| LMArena Math | 1491 | — |
Knowledge Kimi K3 leads
Kimi K3: 63.2 (#21), o3-pro: 29.5 (#238)
| Benchmark | Kimi K3 | o3-pro |
|---|---|---|
| GPQA Diamond | 93.1% | — |
| SimpleQA Verified | 50.6% | — |
| Confabulations | — | 14.2% |
| Vectara Hallucination Rate | — | 23.3% |
| LMArena Expert | 1521 | — |
Multimodal Not comparable
Kimi K3: 37.8 (#70), o3-pro: —
| Benchmark | Kimi K3 | o3-pro |
|---|---|---|
| Blueprint-Bench 2 | 29.5% | — |
| Furniture Assembly | 34.2% | — |
Multilingual Not comparable
Kimi K3: 56.3 (#21), o3-pro: —
| Benchmark | Kimi K3 | o3-pro |
|---|---|---|
| LMArena Non-English | 1466 | — |
| LMArena Chinese | 1529 | — |
| LMArena French | 1491 | — |
| LMArena German | 1488 | — |
| LMArena Japanese | 1487 | — |
| LMArena Korean | 1458 | — |
| LMArena Russian | 1482 | — |
| LMArena Spanish | 1472 | — |
Instruction Following Not comparable
Kimi K3: 77.7 (#14), o3-pro: —
| Benchmark | Kimi K3 | o3-pro |
|---|---|---|
| LMArena Instruction Following | 1483 | — |
Long Context o3-pro leads
Kimi K3: 45.8 (#29), o3-pro: 72.2 (#1)
| Benchmark | Kimi K3 | o3-pro |
|---|---|---|
| Fiction.LiveBench | — | 97.2% |
| LMArena Longer Query | 1494 | — |
Writing & Preference Kimi K3 leads
Kimi K3: 76.6 (#4), o3-pro: 57.1 (#133)
| Benchmark | Kimi K3 | o3-pro |
|---|---|---|
| LMArena Text | 1476 | — |
| LMArena Creative Writing | 1454 | — |
| Short-Story Creative Writing | — | 84.4% |
| EQ-Bench Creative Writing | 2082 | — |
| EQ-Bench 4 | 1339 | — |
| LMArena Multi-Turn | 1488 | — |
Frequently asked questions
Is Kimi K3 better than o3-pro?
Kimi K3 is the stronger model overall, scoring 59.5 to 42.9 on the Noometry Index.
Which is cheaper, Kimi K3 or o3-pro?
Kimi K3 is cheaper. It lists at $3 per million input tokens and $15 per million output tokens; o3-pro lists at $20 and $80.
Is Kimi K3 or o3-pro better for coding?
Kimi K3 scores higher on coding benchmarks: 61.0 versus 55.5 in the Noometry coding category.
Which has the bigger context window?
Kimi K3 does, with 1.05M tokens against 200K.
How many benchmarks do Kimi K3 and o3-pro share?
6 benchmarks have published results for both models. Kimi K3 has 53 scored results on Noometry and o3-pro has 12.