Compare AI models
| 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 | 253B |
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% | 76% |
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% | — |
LiveCodeBenchCompetitive coding — Coding problems published so recently the AI can't have seen them in training — a contamination-free test of raw programming skill. Higher is better. | — | 66.3% |
| Overview | ||
| Company | Moonshot AI | NVIDIA |
| Release date | Sep 5 2025 | Apr 8 2025 |
| Access | Open Weight | Open Weight |
| Model details | View model | View model |
Other comparisons
Kimi K2 (0905)vsClaude Haiku 5.5Llama Nemotron Ultra 253BvsClaude Haiku 5.5Kimi K2 (0905)vsGPT-6.1 SolLlama Nemotron Ultra 253BvsGPT-6.1 SolKimi K2 (0905)vsGemini 4 ArgonLlama Nemotron Ultra 253BvsGemini 4 ArgonKimi K2 (0905)vsMuse Spark 1.3Llama Nemotron Ultra 253BvsMuse Spark 1.3Kimi K2 (0905)vsGrok 4.7Llama Nemotron Ultra 253BvsGrok 4.7Kimi K2 (0905)vsDeepSeek-V4.1-FlashLlama Nemotron Ultra 253BvsDeepSeek-V4.1-FlashFrequently asked questions
Llama Nemotron Ultra 253B leads Kimi K2 (0905) on 1 of the 1 benchmark they both report (GPQA Diamond). Llama Nemotron Ultra 253B shipped 150 days before Kimi K2 (0905), so benchmark comparisons should account for the intervening progress.
Kimi K2 (0905) has 1T parameters, while Llama Nemotron Ultra 253B has 253B.
On GPQA Diamond, Llama Nemotron Ultra 253B leads at 76% vs Kimi K2 (0905) at 75.1%.