Scaling Mixture-of-Experts (MoE) layers in LLMs, especially for agentic models, has been a major bottleneck. Cursor.com is tackling this head-on by open-sourcing ‘Mixture-of-Kittens’ (MoK), a production MoE training megakernel designed for NVL72s.
MoK’s brilliance lies in fusing all MoE communication and computation into a single, fully deterministic kernel. This redesign fundamentally addresses the communication overhead that often limits performance on multi-node, single NVLink domain hardware like the NVL72, especially when integrated Grace CPUs are slower than their GPU counterparts.
For anyone building or operating large-scale AI agents, understanding this level of optimization is crucial. It is a prime example of deep kernel engineering solving a real-world, high-impact problem in LLM infrastructure, leading to more efficient and scalable agent training.























