Model comparison
Kimi K3 vs Nemotron 3 Ultra
Kimi K3 is the stronger model overall, scoring 59.5 to 42.5 on the Noometry Index. Nemotron 3 Ultra costs 6.5× less per token, which makes it the better buy when Kimi K3's lead doesn't matter for your workload.
Last verified . 30 shared benchmarks.
NVIDIASummary
- They share 30 benchmarks with published results for both. Kimi K3 scores higher in 9 categories and Nemotron 3 Ultra in 0 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in math, where Kimi K3 leads 74.2 to 35.3.
- The biggest single-benchmark swing is ProofBench: 87% for Kimi K3 and 2% for Nemotron 3 Ultra.
- Nemotron 3 Ultra is cheaper at $0.50 / $2.20 per million input/output tokens, against $3 / $15 for Kimi K3.
- Kimi K3 accepts more context: 1.05M tokens versus 262K.
Side by side
| Kimi K3 | Nemotron 3 Ultra | |
|---|---|---|
| Provider | Moonshot AI | NVIDIA |
| Noometry Index | 59.5 | 42.5 |
| Released | 2026-07-16 | 2026-06-04 |
| Weights | Open | Open |
| Context window | 1.05M | 262K |
| Max output | 1.05M | 128K |
| Input $ / M tokens | $3 | $0.50 |
| Output $ / M tokens | $15 | $2.20 |
| Results tracked | 53 | 30 |
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Category by category
Coding Kimi K3 leads
Kimi K3: 61.0 (#10), Nemotron 3 Ultra: 38.1 (#182)
| Benchmark | Kimi K3 | Nemotron 3 Ultra |
|---|---|---|
| FrontierCode | 44.2% | 13.6% |
| SciCode | 59.5% | 40.3% |
| WeirdML | 82.6% | 43.5% |
| LMArena Coding | 1508 | 1468 |
| DeepSWE | 68.5% | — |
| LMArena WebDev | 1654 | — |
| FrontierSWE | 25.9% | — |
| ALE-Bench | 1,524 | — |
Agentic & Tool Use Kimi K3 leads
Kimi K3: 41.8 (#20), Nemotron 3 Ultra: 23.4 (#126)
| Benchmark | Kimi K3 | Nemotron 3 Ultra |
|---|---|---|
| APEX-Agents | 50.6% | 22.7% |
| 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), Nemotron 3 Ultra: 31.0 (#82)
| Benchmark | Kimi K3 | Nemotron 3 Ultra |
|---|---|---|
| CritPt | 23.4% | 3.1% |
| Chess Puzzles | 39% | 12% |
| LMArena Hard Prompts | 1496 | 1452 |
| Mystery Game Puzzles | 26% | 20% |
| DTBench | 91.2% | 90.1% |
| LMCA | 52.7% | 36.9% |
| Epoch Capabilities Index | 157.45 | 146.17 |
| ARC-AGI-2 | 60.4% | — |
| SimpleBench | 60.7% | — |
| NYT Connections (extended) | 93.6% | — |
| ARC-AGI-1 | 94.5% | — |
| Surface Evolver Bench | 95% | — |
| ForecastBench | 61.1 | — |
Math Kimi K3 leads
Kimi K3: 74.2 (#16), Nemotron 3 Ultra: 35.3 (#187)
| Benchmark | Kimi K3 | Nemotron 3 Ultra |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 97.2% | 86.7% |
| ProofBench | 87% | 2% |
| LMArena Math | 1491 | 1457 |
| FrontierMath (Tiers 1-3) | 72.2% | — |
| FrontierMath Tier 4 | 39% | — |
| MathArena Final-Answer Competitions | 87.8% | — |
Knowledge Kimi K3 leads
Kimi K3: 63.2 (#21), Nemotron 3 Ultra: 52.5 (#61)
| Benchmark | Kimi K3 | Nemotron 3 Ultra |
|---|---|---|
| GPQA Diamond | 93.1% | 85.4% |
| LMArena Expert | 1521 | 1472 |
| SimpleQA Verified | 50.6% | — |
Multimodal Not comparable
Kimi K3: 37.8 (#70), Nemotron 3 Ultra: —
| Benchmark | Kimi K3 | Nemotron 3 Ultra |
|---|---|---|
| Blueprint-Bench 2 | 29.5% | — |
| Furniture Assembly | 34.2% | — |
Multilingual Kimi K3 leads
Kimi K3: 56.3 (#21), Nemotron 3 Ultra: 53.5 (#64)
| Benchmark | Kimi K3 | Nemotron 3 Ultra |
|---|---|---|
| LMArena Non-English | 1466 | 1427 |
| LMArena Chinese | 1529 | 1497 |
| LMArena French | 1491 | 1472 |
| LMArena German | 1488 | 1471 |
| LMArena Korean | 1458 | 1386 |
| LMArena Russian | 1482 | 1417 |
| LMArena Spanish | 1472 | 1454 |
| LMArena Japanese | 1487 | — |
Instruction Following Kimi K3 leads
Kimi K3: 77.7 (#14), Nemotron 3 Ultra: 74.7 (#88)
| Benchmark | Kimi K3 | Nemotron 3 Ultra |
|---|---|---|
| LMArena Instruction Following | 1483 | 1418 |
Long Context Kimi K3 leads
Kimi K3: 45.8 (#29), Nemotron 3 Ultra: 43.9 (#81)
| Benchmark | Kimi K3 | Nemotron 3 Ultra |
|---|---|---|
| LMArena Longer Query | 1494 | 1437 |
Writing & Preference Kimi K3 leads
Kimi K3: 76.6 (#4), Nemotron 3 Ultra: 66.3 (#36)
| Benchmark | Kimi K3 | Nemotron 3 Ultra |
|---|---|---|
| LMArena Text | 1476 | 1445 |
| LMArena Creative Writing | 1454 | 1398 |
| EQ-Bench Creative Writing | 2082 | 1692 |
| LMArena Multi-Turn | 1488 | 1411 |
| EQ-Bench 4 | 1339 | — |
Frequently asked questions
Is Kimi K3 better than Nemotron 3 Ultra?
Kimi K3 is the stronger model overall, scoring 59.5 to 42.5 on the Noometry Index. Nemotron 3 Ultra costs 6.5× less per token, which makes it the better buy when Kimi K3's lead doesn't matter for your workload.
Which is cheaper, Kimi K3 or Nemotron 3 Ultra?
Nemotron 3 Ultra is cheaper. It lists at $0.50 per million input tokens and $2.20 per million output tokens; Kimi K3 lists at $3 and $15.
Is Kimi K3 or Nemotron 3 Ultra better for coding?
Kimi K3 scores higher on coding benchmarks: 61.0 versus 38.1 in the Noometry coding category.
Which has the bigger context window?
Kimi K3 does, with 1.05M tokens against 262K.
How many benchmarks do Kimi K3 and Nemotron 3 Ultra share?
30 benchmarks have published results for both models. Kimi K3 has 53 scored results on Noometry and Nemotron 3 Ultra has 30.