StepNets one-step weather backbone: variable-aware embedding and a two-stage trunk, 69 ERA5-like variables, 1.5° grid (121×240 lat×lon in the paper).

If you use this checkpoint or architecture, cite:

Sonny: Breaking the Compute Wall in Medium-Range Weather Forecasting — Minjong Cheon, arXiv:2603.21284, 2026. https://arxiv.org/abs/2603.21284

Code: https://github.com/jmj2316/Sonny