Something to keep in mind is that for large models, it can take some time to generate the model history, and this is also a blocking activity for the model. I would recommend end users only pull model history for a very short date range at a time, as anything more will tend to impact concurrency.
You can create a model history export action that exports all model history for a set time period by clicking the save option (on a standard model)
You can then automate the export of model history action (using a script , see page 85), then import the model history back into an Anaplan module for reporting. The model history headers will vary though based on updates to dimensions so you'll have to account for that when loading into module line items.
There should be a way to get model history into a module so it can be summarized and queried on. There have been multiple users who have asked for a 'change report.' Managers want to see what has changed in the model sometimes by person sometimes by time period. SOX teams who evaluate commission calculation for ICM models want to see changes to the model.