Fast Grok model for responsive chat, reasoning, and tool-assisted work
Details
| Field | Value |
|---|---|
| id | x-ai/grok-4.2-fast |
| modality | text+image+video->text |
| context_length | 2000000 |
| max_output_tokens | 30000 |
| knowledge_cutoff | 2025-08-31 |
| release_date | 2026-03-20 |
| is_open_weights | no |
| supports_tool_call | yes |
| supports_reasoning | yes |
| supports_structured_output | no |
| supports_attachment | yes |
| input_modalities | text, image, video |
| output_modalities | text |