Step-Video Review — Stepfun's 30B Open-Source Video Model: The Largest Publicly Available Video Generator (and What That Costs)

Step-Video-T2V (February 2025) by Stepfun is a 30B-parameter open-source text-to-video model — the largest publicly released video generation model at launch. MIT license. Custom benchmark claims state-of-the-art. VBench-I2V #1 for the image-to-video variant. Hardware requirement: 72-78 GB VRAM. 3,200 GitHub stars. Bilingual (English + Chinese). Rating 3/5.