NextStep 1 Large Pretrain
NextStep 1 Large Pretrain is the published pretraining-stage model in the original NextStep family. Its card describes the 14B autoregressive backbone and 157M flow-matching head.
Research release
Use the named training stage
The repository is separate from NextStep-1-Large and its editing release. It gives researchers a pretraining checkpoint to adapt or compare with the completed generation model.StepFun NextStep-1-Large-Pretrain model card
Define what the next training stage should add
Practical guidance. A base image model can be useful for domain adaptation or preference training. State the intended change first, such as better layout control or a document style, and compare it with the unmodified checkpoint.
Specifications & access
| Detail | Value and conditions |
|---|---|
| Status | Research release |
| Access | Downloadable |
| Model identifiers | NextStep-1-Large-Pretrain |
| License | Apache 2.0.StepFun NextStep-1-Large-Pretrain model card |
| Access | Weights and a separate VAE checkpoint are published.StepFun NextStep-1-Large-Pretrain model card |
Related models
- NextStep 1 Large
StepFun · NextStep
An image-generation model combining a 14B autoregressive backbone with a 157M flow-matching head.
Launch date not confirmedDownloadable - NextStep 1.1 Pretrain
StepFun · NextStep
A pretraining-stage checkpoint of the NextStep 1.1 autoregressive image-generation model.
Launch date not confirmedResearch releaseDownloadable