lichen

What it is

Lichen is a drop-in, API-compatible replacement for Jev, TypeSafe's System One model, that runs open-weight models on local hardware. It serves the same /v1/systemone endpoint and returns the same typed answers (choice, noul and score) with a probability for every option, so existing Jev clients work against it…

Where the decision sits

lichen calls the hosted decision API rather than running its own weights. That keeps the project small and means its behaviour moves whenever the vendor ships a new model version. It also means an API key and a network round trip sit in the path of every decision.

Models it references: Jev.

How active it is

Created 2026-09-23, last pushed 2026-09-30, 59 stars and 4 forks when we read it on 2026-11-02. Everything in this category is weeks old at most, so a stale push date means something different here than it would on a mature project. Check the repository before you depend on it.