Kimi K2vsNemotron 3 Ultra
Kimi K2 | 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. | 128k | — |
| 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. | $0.57Novita | — |
Cheapest outputLowest output rate across third-party providers, excluding the lab itself. May come from a different provider than the cheapest input. | $2.30Novita | — |
| 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 | ||
BullshitBench v2Nonsense detection — Given a confidently-worded but nonsensical prompt, does the AI spot that it makes no sense and push back — instead of playing along and inventing an answer? The score is how often it clearly called out the nonsense. Higher is better. | 10% | — |
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 | Jul 11 2025 | Jun 4 2026 |
| Access | Open Weight | Open Source |
Other comparisons
Kimi K2vsClaude Opus 5Nemotron 3 UltravsClaude Opus 5Kimi K2vsGPT-5.6 SolNemotron 3 UltravsGPT-5.6 SolKimi K2vsGemini 3.7 FlashNemotron 3 UltravsGemini 3.7 FlashKimi K2vsMuse GlimmerNemotron 3 UltravsMuse GlimmerKimi K2vsGrok 4.6Nemotron 3 UltravsGrok 4.6Kimi K2vsDeepSeek-V4-Pro-0813Nemotron 3 UltravsDeepSeek-V4-Pro-0813
Frequently asked questions
Nemotron 3 Ultra leads Kimi K2 on 1 of the 1 benchmark they both report (GPQA Diamond). Kimi K2 shipped 328 days before Nemotron 3 Ultra, so benchmark comparisons should account for the intervening progress.
Kimi K2 has 1T parameters, while Nemotron 3 Ultra has 550B. Kimi K2 is open weight, while Nemotron 3 Ultra is open source.
On GPQA Diamond, Nemotron 3 Ultra leads at 86.7% vs Kimi K2 at 75.1%.
Kimi K2 was released by Moonshot AI on Jul 11 2025.
Nemotron 3 Ultra was released by NVIDIA on Jun 4 2026.
Nemotron 3 Ultra leads on GPQA Diamond — Kimi K2 75.1% vs Nemotron 3 Ultra 86.7%.
Kimi K2 is an open weight model released by Moonshot AI. Nemotron 3 Ultra is an open source model released by NVIDIA.