LongCat is a self-developed large model AI dialogue platform launched by Meituan, with strong natural language processing capabilities. The latest version of LongCat-Flash-Chat has been officially open-sourced, adopting an innovative hybrid expert model (Mixture-of-Experts, MoE) architecture, with a total parameter count of 560 billion, and only activating 18.6 to 31.3 billion parameters per token on average, achieving efficient utilization of computing power.