This is the 'Slab' model (Had3SM), runs in about the same time as SAP, but uses a lot less memory (50MB or thereabouts). Old timers will recognise this as the same model as was run in 2005.
This model is supporting 3 different experiments, one is Berlin University experimenting with the starting parameters in conjunction with a neural network, I don't know about the other two.
The normal coupled model (Had3CM) is still available.
You can select which one to download via project options.
If I understand correctly, if both are turned off, or both are turned on, then it is random which will be delivered to your PC. If one is turned off and the other is turned on, then the one that is turned on will be delivered to your PC.Application Preferences
HADSM3 Not selected
HADCM3 Not selected
I gather that the long-term intention is to provide all variations of the climate model via this mechanism (so one day you may be able to run a SAP model via the main CPDN site). Whether this is how it ends up I don't know