daseinlabs/open-jev

Turn local language models into Jev-style structured decision models. Get results from text and images with prefill alone—no token-by-token decoding required.

Local decision model with calibrated probabilities: send a state and yes/no, choice or score questions, get a probability for every option. 0.8B GGUF on CPU, Jev-style API.

The open, local take on Jev: typed decisions from an LLM, without generating a single token

Jeva: System One Models from First Principles

Jev-compatible API endpoint based on open models (prefill-only)

Turn any LLM into a Jev-style decision model: typed decisions, real probabilities, no training. (continue updating, welcome any issue and PR request)

jevos: an open-source alternative to Jev and Microsoft-Decision-1. Yes/no decisions, choices and scores with probabilities, on your laptop's CPU.

Open-weight, Jev-inspired decision model finetuned on top of Qwen3.5 4B

Open infrastructure for training, evaluating, and deploying System 1 decision models across language and multimodal backbones.