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 | — |
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 | 2M |
| Overview | ||
| Company | Moonshot AI | SpaceXSI |
| Release date | Oct 23 2026 | Sep 19 2025 |
| Access | Closed | Closed |
| Model details | View model | View model |
Other comparisons
Kimi K3.1 Pro HighspeedvsClaude Haiku 5.5Grok 4 FastvsClaude Haiku 5.5Kimi K3.1 Pro HighspeedvsGPT-6.1 SolGrok 4 FastvsGPT-6.1 SolKimi K3.1 Pro HighspeedvsGemini 4 ArgonGrok 4 FastvsGemini 4 ArgonKimi K3.1 Pro HighspeedvsMuse Spark OpenGrok 4 FastvsMuse Spark OpenKimi K3.1 Pro HighspeedvsDeepSeek-V4.1-Flash-1017Grok 4 FastvsDeepSeek-V4.1-Flash-1017Kimi K3.1 Pro HighspeedvsMistral Large 4Grok 4 FastvsMistral Large 4Frequently asked questions
Kimi K3.1 Pro Highspeed and Grok 4 Fast don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Grok 4 Fast shipped 399 days before Kimi K3.1 Pro Highspeed, so benchmark comparisons should account for the intervening progress.
Context windows are 1M (Kimi K3.1 Pro Highspeed) vs 2M (Grok 4 Fast).
Direct benchmark comparisons are unavailable — Kimi K3.1 Pro Highspeed and Grok 4 Fast don't publish scores on any of the same benchmarks.