# NaceAI 发布 Drex 决策模型，输出选项概率

- 来源：Rohan Paul (@rohanpaul_ai)
- 发布时间：2026-09-26 00:35
- AIHOT 分数：44
- AIHOT 链接：https://aihot.news/items/cmuh6syb806ggro5584qf6nzw
- 原文链接：https://x.com/rohanpaul_ai/status/2103523705603461145

## AI 摘要

NaceAI 推出 Drex，一个 sub-6B 决策模型，不生成文本而是直接输出各选项概率，一次前向即可完成，面向智能体路由、工具选择、重排序与策略检查等场景。Drex 采用小型扩散模型加 RLAF 架构，定价 $0.04/1M input tokens，延迟低于 1 秒，在 Decision Index 上排名 #1，40 项 benchmark 中赢下 23 项，开放权重与技术报告即将发布。

## 正文

Most agent stacks use a generative model to make decisions that never needed prose in the first place.

@NaceAI just launched Drex, a sub-6B decision model that outputs option probabilities instead of generating prose.

facts in, a probability for each available option out, in one pass. No reasoning paragraph to generate, then parse back into a tool call or routing decision.

And that makes a huge difference for agent routing, tool selection, reranking, policy checks, and other places where the system ultimately needs to choose from a known set.
And Nace explicitly positions Drex around those workloads.

If the output you need is a decision, generation can be unnecessary compute.

### 引用推文

> Nace AI：Introducing Drex - a lightning-fast decision model built to rival Jev. #1 on the Decision Index. (official scores tbd) winning 23 out of 40 benchmarks Architect...