The data of ML models other than AIFS can be accessed here:

https://www.ecmwf.int/en/forecasts/datasets/data-driven-forecasts

(there is an additional link on the above page to access binary data)

It is also available in MARS (for data records going more 3 days back):

https://apps.ecmwf.int/mars-catalogue/?class=ml

GraphCast https://apps.ecmwf.int/mars-catalogue/?type=fc&class=ml&stream=oper&expver=dmgc

FuXi https://apps.ecmwf.int/mars-catalogue/?type=fc&class=ml&stream=oper&expver=fuxi

FourCastNet2 https://apps.ecmwf.int/mars-catalogue/?type=fc&class=ml&stream=oper&expver=sfno

Pangu https://apps.ecmwf.int/mars-catalogue/?type=fc&class=ml&stream=oper&expver=pguw

AIFS https://apps.ecmwf.int/mars-catalogue/?type=fc&class=ml&stream=oper&expver=aifs