# 面壁智能开源 MiniCPM5-2B 并公开其 RL 训练栈 Meshy 与 JustRL II

- 来源：OpenBMB (@OpenBMB)
- 发布时间：2026-09-08 21:21
- AIHOT 分数：58
- AIHOT 链接：https://aihot.news/items/cmtspsa4802fhroou2wjvg6l3
- 原文链接：https://x.com/OpenBMB/status/2097314300960604530

## AI 摘要

面壁智能（OpenBMB）开源 2B 参数端侧模型 MiniCPM5-2B，在 Artificial Analysis Intelligence Index 上得分 23，为 4B 以下开源模型第一，Agentic Index 得分 20，34 项基准平均 53.9。

## 正文

Yesterday, we open-sourced MiniCPM5-2B. Today, we’re opening up the RL stack behind it.
Meet Meshy, our in-house, service-based async RL engine. No Ray. No central controller. Inference, rollout, and training run as independent services over a unified data plane. And JustRL II, a critic-based recipe for scaling small LLMs to 128K reasoning. This is the RL stack behind MiniCPM5-2B.
https://x.com/OpenBMB/status/2097308982071431543?s=20

### 引用推文

> OpenBMB：🚀 Meet MiniCPM5-2B, a 2B-parameter language model bringing high intelligence density to the edge, now open source! It ranks #1 among open-source models under 4...