Kev-0.5B: A Tiny Open-Source Decision Model to Train on a MacBook

Melvin Vivas · X post · 2026-09-19 · Open on X

Topics: Fine-tuning & Model Customization · Level: intermediate

Summary

Shares Kev-0.5B, a tiny open-source decision model similar to Jev, with a TypeSafe-compatible API. The quoted post says it is built on Qwen2.5-0.5B, and you can train and run it on a MacBook Pro. The model card and weights are on GitHub.

Key points

• Kev-0.5B is a small decision model, about 0.5B parameters.
• The quoted post says the base is Qwen2.5-0.5B, but the GitHub repo title says Qwen3.5/3.8. Check the repo.
• Comes with a TypeSafe-compatible API.
• Small enough to train and run on a MacBook Pro.
• Model card and weights are on GitHub (jaredpalmer/kev).

Resources mentioned

• jaredpalmer/kev (GitHub) · repo · github.com · free
  Family of Jev-like decision models built on Qwen that you can train and run yourself.
• Qwen2.5-0.5B · tool · huggingface.co · free
  Tiny open-weight Qwen model, named as the base for Kev-0.5B.

Try this

• Train your own model; try Kev-0.5B from the GitHub repo.
• Train and run a tiny decision model locally on a MacBook.