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. | 48B | — |
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 30 2025 | Sep 19 2025 |
| Access | Open Weight | Closed |
| Model details | View model | View model |
Other comparisons
Kimi LinearvsClaude Haiku 5.5Grok 4 FastvsClaude Haiku 5.5Kimi LinearvsGPT-6.1 SolGrok 4 FastvsGPT-6.1 SolKimi LinearvsGemini 4 ArgonGrok 4 FastvsGemini 4 ArgonKimi LinearvsMuse Spark OpenGrok 4 FastvsMuse Spark OpenKimi LinearvsDeepSeek-V4.1-Flash-1017Grok 4 FastvsDeepSeek-V4.1-Flash-1017Kimi LinearvsMistral Large 4Grok 4 FastvsMistral Large 4Frequently asked questions
Kimi Linear 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 41 days before Kimi Linear, so benchmark comparisons should account for the intervening progress.
Context windows are 1M (Kimi Linear) vs 2M (Grok 4 Fast). Kimi Linear is open weight, while Grok 4 Fast is closed.
Direct benchmark comparisons are unavailable — Kimi Linear and Grok 4 Fast don't publish scores on any of the same benchmarks.