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