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StepFun

Step Image Edit 2

Step Image Edit 2 is StepFun's latest lightweight generation and editing model. The English docs describe it as an under-6B model that supports both text-to-image and image editing, targets 1-2 second response times, supports input images up to 4096x4096 for editing and exposes OpenAI-style image endpoints for generations and edits.

Partially availableFull English UIPublic APIPaidPartial evidence

Quick answers

At a glance

Overview
StepFun's lightweight image model for unified text-to-image and image editing through Open Platform APIs.
Best fit
Developers testing low-latency Chinese image-generation and image-editing APIs for interactive apps.
Trust
1/1 sources verified · 2026-05-17
Coverage
91/100 · backfill: sources, freshness

Editorial verdict

Best for

Developers testing low-latency Chinese image-generation and image-editing APIs for interactive apps.

Avoid if

Avoid it when you need a mature consumer design studio rather than an API-first image model.

Why it matters

Step Image Edit 2 is concrete enough to track separately because the docs publish endpoints, limits and per-image pricing.

Pricing

$0.003 per text-to-image or image-editing result

Payment

Open Platform balance, API billing

Commercial use

Commercial use should follow StepFun image API terms and content policy for generated or edited images.

Privacy

Image editing can involve user-uploaded images; review data processing and retention terms before sensitive inputs.

Use-case fit

Interactive image editing

Strong

Use it when low-latency prompt-based editing matters more than a full design suite.

API text-to-image generation

Medium

Use the /v1/images/generations endpoint for prompt-driven generation in apps.

Global user checklist

RegistrationPartialRequires StepFun Open Platform account and API key.
English UIConfirmedEnglish image model docs are available.
API and docsConfirmedDocs publish image generation and image editing endpoints with curl examples.
Commercial usePartialReview content and uploaded-image data terms before production.
Coverage · 91/100 · backfill: sources, freshness

This profile is stale enough to recheck before commercial use.

Pros

  • - One model supports both text-to-image and image editing
  • - Docs claim 1-2 second editing response
  • - Simple API endpoints for generations and edits

Cons

  • - Prompt length is limited to 512 characters
  • - International onboarding and production limits still need account testing

Decision paths

qwen-image

seedream-image

zhipu-glm-image

minimax-image

Sources

Step Image Edit 2

docs · en · verified 2026-05-17

Documents capabilities, endpoints, limits, quickstarts and pricing.

Reviews