Kimi K2 (0905)vsNemotron 3 Ultra
Kimi K2 (0905) | Nemotron 3 Ultra | |
|---|---|---|
| Specifications | ||
ParametersA rough measure of how big the model is. More parameters usually means more capable and more expensive to run, though it is a poor guide on its own — a smaller, newer model often beats a larger, older one. | 1T | 550B |
Context windowHow much text the model can hold in mind at once — your question, any documents you attach, the conversation so far, and its own reply. Go past it and the earliest part falls out of view. | 256k | — |
| API pricingUSD per 1M tokens · lower wins | ||
Cheapest inputLowest input rate across third-party providers, excluding the lab itself. The cheapest endpoint may run a quantised build or a shorter context — see "Available from" on the model page. | $0.60Novita | — |
Cheapest outputLowest output rate across third-party providers, excluding the lab itself. May come from a different provider than the cheapest input. | $2.50Novita | — |
| Benchmarks | ||
GPQA DiamondScience — Graduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | 75.1% | 86.7% |
| BenchmarksPublished by one model only | ||
SWE-Bench VerifiedCoding — Real coding tasks pulled from open-source projects — the AI has to find and fix actual bugs. A human-checked version of the original SWE-Bench. Higher is better. | 65.8% | — |
AA Intelligence IndexOverall intelligence — Artificial Analysis composite intelligence index across evals | — | 48 |
| Overview | ||
| Company | Moonshot AI | NVIDIA |
| Release date | Sep 5 2025 | Jun 4 2026 |
| Access | Open Weight | Open Source |
Other comparisons
Frequently asked questions
Nemotron 3 Ultra leads Kimi K2 (0905) on 1 of the 1 benchmark they both report (GPQA Diamond). Kimi K2 (0905) shipped 272 days before Nemotron 3 Ultra, so benchmark comparisons should account for the intervening progress.
Kimi K2 (0905) has 1T parameters, while Nemotron 3 Ultra has 550B. Kimi K2 (0905) is open weight, while Nemotron 3 Ultra is open source.
On GPQA Diamond, Nemotron 3 Ultra leads at 86.7% vs Kimi K2 (0905) at 75.1%.
Kimi K2 (0905) was released by Moonshot AI on Sep 5 2025.
Nemotron 3 Ultra was released by NVIDIA on Jun 4 2026.
Nemotron 3 Ultra leads on GPQA Diamond — Kimi K2 (0905) 75.1% vs Nemotron 3 Ultra 86.7%.
Kimi K2 (0905) is an open weight model released by Moonshot AI. Nemotron 3 Ultra is an open source model released by NVIDIA.