Jev 推出新型 LLM：System One 决策模型
原标题：Jev introduces a new shape of LLM - System One, aka Decision Models
AI 摘要
TypeSafe AI 发布 Jev，一种被称为「System One 模型」或「决策模型」的新型 LLM：输入文本，输出浮点数形式的分类、是/否判断、评分及置信度，而非文本。Jev 仅按输入 token 计费（每百万 token 0.042 美元），输出免费，速度极快，适合垃圾邮件检测、标签推荐、排序与搜索重排等分类任务。作者指出其黑盒性质带来偏见隐患，并提到社区已涌现 jevchat、jev-2048 等创意用法及基于 Qwen 3.5 的开源复刻尝试。
正文节选
Jev introduces a new shape of LLM—System One, aka Decision Models 21st September 2026 Last week TypeSafe AI unveiled Jev, their first example of a new category of model that they are calling “System One models” (I’m with Maggie Appleton, I think “decision models” is a better name for these). Jev is an interesting variant on the usual LLM format: it still accepts text inputs, but instead of text output it returns floating point numbers corresponding to categories, yes/no questions, ratings, and a