StepFun's next-generation flagship base model for coding and professional knowledge work, with native text, image, and video input and a 1M-token context window
Details
| Field | Value |
|---|---|
| id | step-5-preview |
| modality | text+image+video->text |
| context_length | 1024000 |
| max_output_tokens | 131072 |
| release_date | 2026-09-16 |
| is_open_weights | no |
| supports_tool_call | yes |
| supports_reasoning | yes |
| supports_structured_output | yes |
| supports_attachment | yes |
| input_modalities | text, image, video |
| output_modalities | text |