Jev introduces a new shape of LLM—System One, aka Decision Models simonwillison.net ↗

Simon Willison on TypeSafe’s Jev: a model that skips text and returns typed, probabilistic answers to yes/no or multiple-choice questions, priced at $0.042 per million input tokens. Useful for spam filtering, but he flags it as a black box: just a number, no explanation.