Fast Grok model for responsive chat, reasoning, and tool-assisted work
Details
| Field | Value |
|---|---|
| id | grok-4-1-fast-reasoning |
| family | grok |
| modality | text+image->text |
| context_length | 2000000 |
| max_output_tokens | 30000 |
| release_date | 2025-11-19 |
| is_open_weights | no |
| supports_tool_call | yes |
| supports_reasoning | yes |
| supports_structured_output | yes |
| supports_attachment | yes |
| input_modalities | text, image |
| output_modalities | text |