Step1X-Edit
Open instruction-based image editing — tell it what to change, in plain words.
About
Step1X-Edit, released April 25, 2025 with tech report arXiv 2504.17761, is StepFun's open-weights answer to instruction-based editing: hand it an image plus a natural-language instruction ('make the sky sunset orange') and it returns the edit while preserving the original composition. It ships Diffusers-native so it drops into existing pipelines, and StepFun released the GEdit-Bench evaluation set alongside the weights — unusual transparency for an editing model. The stated goal is matching closed editors like GPT-4o and Gemini 2 Flash; whether it fully does is still debated, but as an open base it is one of the strongest available. v1.1 (July 2026) added Ascend NPU targeting for the Chinese hardware ecosystem. No parameter count or architecture details disclosed, which is the main transparency gap.
Specs
Context window
Pricing
Free quota
API access
Weights
Released
Benchmarks
Team-released GEdit-Bench evaluation set for instruction-based editing (provider-released)
Provider-reported unless a source says otherwise. Benchmarks are marketing-adjacent by nature — treat them as directional.
Use cases
Trust score — 7/10
Scored 7/10 (verified tier, metrics-v1). Evidence: Weights and tech report released Apr 25, 2025 (arXiv 2504.17761); StepFun instruction-based editing.; Diffusers-native; GEdit-Bench evaluation set released alongside — unusual transparency.; Aims to match GPT-4o/Gemini 2 Flash editing; among strongest open editing bases.; Limitations: no parameter count or architecture details disclosed..