Latest version: CY41R2 operational since 8/03/2016 (included):
ECMWF Model Description
Model version CY41R1 operational from 14/05/2015 (included) to 8/03/2016 (included):
ECMWF Model Description CY41R1
Model version CY40R1, operational before 14/05/2015 (excluded):
ECMWF model description before 14/05/2015