Can Jev Replace the LLM Judge? Measuring Correctness Before Speed

Comparison of Jev with Claude Haiku and Claude Sonnet, each used one-shot and with thinking, on binary correctness and rubric scoring Photo by Conny Schneider on Unsplash Experiments run in October 2026. Introduction Since TypeSafe introduced Jev as a System One decision model, there has been a lot of interest in using it wherever a system has to make a decision from a context and a question. Jev is built for fast, single-pass decisions: instead of generating text, it returns a typed answer together with calibrated probabilities [1]. One task that fits this shape is evaluating the answers of a