To create a relaxed version of your model that contains only continuous variables and removes SOS and general constraints, use:
relax = model.relax()
This creates a new Model object and does not modify the original model.
Another option is to "relax" a model in place, iterate through the model variables and change their type:
for v in model.getVars():
In addition, all nonlinear constraints must be removed from the model.
Yet another alternative to relaxing the model is to fix all integer variables to their value in the loaded solution:
fixed = model.fixed()
The "fixed" method returns a new model object that only contains continuous variables.