Compare AI models
| Specifications | ||
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. | 128k | 2M |
| Overview | ||
| Company | Moonshot AI | SpaceXSI |
| Release date | Jan 20 2025 | Sep 19 2025 |
| Access | Closed | Closed |
| Model details | View model | View model |
Other comparisons
Kimi K1.5vsClaude Haiku 5.5Grok 4 FastvsClaude Haiku 5.5Kimi K1.5vsGPT-6.1 SolGrok 4 FastvsGPT-6.1 SolKimi K1.5vsGemini 4 ArgonGrok 4 FastvsGemini 4 ArgonKimi K1.5vsMuse Spark OpenGrok 4 FastvsMuse Spark OpenKimi K1.5vsDeepSeek-V4.1-Flash-1017Grok 4 FastvsDeepSeek-V4.1-Flash-1017Kimi K1.5vsMistral Large 4Grok 4 FastvsMistral Large 4Frequently asked questions
Kimi K1.5 and Grok 4 Fast don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Kimi K1.5 shipped 242 days before Grok 4 Fast, so benchmark comparisons should account for the intervening progress.
Context windows are 128k (Kimi K1.5) vs 2M (Grok 4 Fast).
Direct benchmark comparisons are unavailable — Kimi K1.5 and Grok 4 Fast don't publish scores on any of the same benchmarks.