Compare AI models
| Specifications | ||
ParametersThe learned values that shape how a model responds. B means billion and T means trillion. For mixture-of-experts models, the total count is larger than the number active for each token. Parameter count alone does not measure quality. | 2.8T | 253B |
Context windowHow much information the model can work with in one request, measured in tokens — pieces of words or other data. This includes your question, attachments, conversation and reply. Limits can vary by model variant and provider. | 1M | 128k |
| These models have no shared benchmark scores. | ||
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% |
GPQA DiamondScience — Graduate-level science questions in biology, physics, and chemistry — hard enough that subject-matter PhDs score around 65%. Higher is better. | — | 76% |
| Overview | ||
| Company | Moonshot AI | NVIDIA |
| Release date | Oct 23 2026 | Apr 7 2025 |
| Access | Closed | Open Weight |
| Model details | View model | View model |
Other comparisons
Kimi K3.1 Pro HighspeedvsClaude Haiku 5.5Llama Nemotron Ultra 253BvsClaude Haiku 5.5Kimi K3.1 Pro HighspeedvsGPT-6.1 SolLlama Nemotron Ultra 253BvsGPT-6.1 SolKimi K3.1 Pro HighspeedvsGemini 4 ArgonLlama Nemotron Ultra 253BvsGemini 4 ArgonKimi K3.1 Pro HighspeedvsMuse Spark OpenLlama Nemotron Ultra 253BvsMuse Spark OpenKimi K3.1 Pro HighspeedvsGrok 4.7Llama Nemotron Ultra 253BvsGrok 4.7Kimi K3.1 Pro HighspeedvsDeepSeek-V4.1-Flash-1017Llama Nemotron Ultra 253BvsDeepSeek-V4.1-Flash-1017Frequently asked questions
Kimi K3.1 Pro Highspeed and Llama Nemotron Ultra 253B don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Llama Nemotron Ultra 253B shipped 564 days before Kimi K3.1 Pro Highspeed, so benchmark comparisons should account for the intervening progress.
Kimi K3.1 Pro Highspeed has 2.8T parameters, while Llama Nemotron Ultra 253B has 253B. Context windows are 1M (Kimi K3.1 Pro Highspeed) vs 128k (Llama Nemotron Ultra 253B). Kimi K3.1 Pro Highspeed is closed, while Llama Nemotron Ultra 253B is open weight.
Direct benchmark comparisons are unavailable — Kimi K3.1 Pro Highspeed and Llama Nemotron Ultra 253B don't publish scores on any of the same benchmarks.