Open-Jev: open-source 2B/9B decision models inspired by JEV

Zefan Cai @Zefan_CaiOriginally posted 2026.09.21

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Inspired by Jev, we built Open-Jev: open-source decision models. 2B/9B: LoRA adapters + decision heads. Code: https://github.com/Zefan-Cai/Open-Jev Data: https://huggingface.co/datasets/ZefanCai/Open-Jev 2B: https://huggingface.co/ZefanCai/Open-Jev-2B 9B: https://huggingface.co/ZefanCai/Open-Jev-9B Watch the demo ↓

This post quotes another post: “ChatGPT co-inventor releases Jev, a model built for decisions rather than text”