---
license: apache-2.0
library_name: pytorch
tags:
  - weather
  - era5
  - pytorch
  - sonny
  - stepnets
pipeline_tag: other
---

# Sonny

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)**.  

## Citation

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](https://arxiv.org/abs/2603.21284)

Code: [https://github.com/jmj2316/Sonny](https://github.com/jmj2316/Sonny)