Overview
The post-training update to NextStep-1, released on 2025-12-24 with both pretraining and post-training weights according to the official repository.
NextStep-1.1
The post-training update to NextStep-1, released on 2025-12-24 with both pretraining and post-training weights according to the official repository.
MODEL NUMBER353
- First public date
- 2025-12-24
- Organization
- StepFun
- Family
- Step Image
01
Specifications
Only published specifications are shown.
- Total parameters
- 14B
- Architecture
- Dense
- Input modalities
- Text · Image
- Output modalities
- Image
- Open weights
- Yes
- License
- Apache-2.0
- Status
- Current
02
Overview
Why it mattered
NextStep-1.1 improves autoregressive image generation with extended training and Flow-based reinforcement learning.
PreviousNextStep-114B · — ctx
CurrentNextStep-1.114B · — ctx
04
Architecture & capabilities
Model capabilities
Image generationImage editing
05
Release history
NextStep-1.1 launched with pretraining and post-training weights.
View source06
Related models
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07
Sources
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