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. | 256k | 2M |
| Overview | ||
| Company | SpaceXSI | SpaceXSI |
| Release date | Jul 9 2025 | Sep 19 2025 |
| Access | Closed | Closed |
| Model details | View model | View model |
Other comparisons
Grok 4vsClaude Haiku 5.5Grok 4 FastvsClaude Haiku 5.5Grok 4vsGPT-6.1 SolGrok 4 FastvsGPT-6.1 SolGrok 4vsGemini 4 ArgonGrok 4 FastvsGemini 4 ArgonGrok 4vsMuse Spark OpenGrok 4 FastvsMuse Spark OpenGrok 4vsDeepSeek-V4.1-Flash-1017Grok 4 FastvsDeepSeek-V4.1-Flash-1017Grok 4vsMistral Large 4Grok 4 FastvsMistral Large 4Frequently asked questions
Grok 4 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 shipped 72 days before Grok 4 Fast, so benchmark comparisons should account for the intervening progress.
Context windows are 256k (Grok 4) vs 2M (Grok 4 Fast).
Direct benchmark comparisons are unavailable — Grok 4 and Grok 4 Fast don't publish scores on any of the same benchmarks.