NextStep 1.1
NextStep 1.1 updates StepFun's autoregressive image line with extended training and flow-based reinforcement learning. The release focuses on visual artifacts and training stability.
Use the model with its image decoder
The repository supplies a custom image-generation pipeline and directs users to download a separate VAE checkpoint. Text and negative prompts are part of the documented example.StepFun NextStep-1.1 model card
Compare structure before fine detail
Practical guidance. When evaluating this update, check object count, layout and text before texture. A cleaner image can still miss the intended composition. Keep the prompt and random seed fixed for a meaningful comparison with NextStep 1.
Specifications & access
| Detail | Value and conditions |
|---|---|
| Access | Downloadable |
| Model identifiers | NextStep-1.1 |
| License | Apache 2.0.StepFun NextStep-1.1 model card |
| Release distinction | The card describes changes to both training and stability, beyond a simple format conversion.StepFun NextStep-1.1 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