When it comes to medium range predictions. If you look at nowcasting, I believe the top dog is metnet 3 (https://arxiv.org/abs/2306.06079).

On a tangential note, I worked on weather forecasting a bit before, and talking with some people still in the field it seems that these organizations (NOAA, ECMWF) are stuck with NWP and refuse to embrace AI models. Not sure if they can't attract talent and so are somewhat stuck or if their higher ups are "old school" and can't really see the potential that this approach has to offer. It is just sad that the private sector is outclassing institutions and that these better models won't hit the public domain.