MODEL LINEAGE
中文
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FAMILY / STEPFUN

Step Image

StepFun’s image-generation and editing line, from Step1X-Edit to NextStep autoregressive image generation.

First model
2025
Models
4
Latest dated version
Step Image Edit 2

01 / RELEASE SEQUENCE

Family release sequence

Compare versions →
  1. 2025-04-25Step1X-EditImage generation · Multimodal
  2. 2025-08-14NextStep-1Image generation · Multimodal
  3. 2025-12-24NextStep-1.1Image generation · Multimodal
  4. 2026-04-29Step Image Edit 2Image generation · Multimodal
4 versions
What changed ↓

02 / GENERATIONS

What changed

01

Step1X-Edit

Step1X-Edit established StepFun’s image-editing line, later extended into reasoning-edit and API versions.

02

NextStep-1

NextStep-1 extends StepFun’s image line from editing into unified autoregressive generation and editing.

03

NextStep-1.1

NextStep-1.1 improves autoregressive image generation with extended training and Flow-based reinforcement learning.

04

Step Image Edit 2

Step Image Edit 2 carries the Step1X-Edit research line into a low-latency API product.