These are available on Weatherbell[1] (which requires a subscription) now except for the HGEFS ensemble model which I'm guessing will probably be added later. AIGFS is on tropical tidbits which should be free for some stuff[5]. I believe some of the research on this is mentioned in these two[2][3] videos from NOAA weather partners site. They also talk about some of the other advances in weather model research.

One of the big benefits of both the single run (AIGFS) and ensemble (AIGEFS) models is the speed and (less) computation time required. Weather modeling is hard and these models should be used as complementary to deterministic models as they all have their own strengths and weaknesses. They run at the same 0.25 degree resolution as the ECMWF AIFS models which were introduced earlier this year and have been successful[4].

Edit: Spring 2025 forecasting experiment results is available here[6].

[1] https://www.weatherbell.com/

[2] https://www.youtube.com/watch?v=47HDk2BQMjU

[3] https://www.youtube.com/watch?v=DCQBgU0pPME

[4] https://www.ecmwf.int/en/forecasts/dataset/aifs-machine-lear...

[5] https://www.tropicaltidbits.com/analysis/models/

[6] https://repository.library.noaa.gov/view/noaa/71354/noaa_713...