2 models · 1–2
| Select models to compare | Model | Released | Context | Input /M | Output /M | Parameters | Type | I/O | Openness |
|---|---|---|---|---|---|---|---|---|---|
 X-Ai/Grok-4-Fast-Non-ReasoningxAI | December 18, 2025 | 2M | — | — | — | Text | text, image, audio, video → text | Closed | |
| X-Ai/Grok-4-Fast-ReasoningxAI | December 18, 2025 | 2M | — | — | — | Text | text, image, audio, video → text | Closed |