The author introduces Lev, an open-source decision engine that mirrors Jev's wire API, built using Jolt with FFI to run open-weight models locally via llama.cpp. The post covers the classifier tier design, failure modes of System One models, independent benchmarks of Jev, and an escalation model that handles low-confidence decisions by falling back to slower reasoning.
Background
TypeSafe recently released Jev, a hosted 'System One' classifier model that produces structured decisions in milliseconds, inspired by Kahneman's fast thinking framework. The Doom demo showcasing real-time gameplay generated significant community interest.
- Source
- Lobsters
- Published
- Sep 25, 2026 at 07:11 AM
- Score
- 5.0 / 10