artificial intelligence

You have the dialog car that have an option that allow it to reask question that the student failed (but it's displayed immediatly after answer get submitted) but that's all I think.

As H5P doesn't really mix and aggregate questions dynamically, but can mostly be only used to display statically created content. So I don't think there's any "AI" involved. It would be possible to dynamically create "learning paths" through a number of H5P content objects, but this would have to be done on the platform level (e.g. Drupal) and not with H5P itself.

The only attempt at introducing AI into H5P was part of the ISAAC project by the University of Tübingen, which seems to not have produced public results. They seem to have moved on to developing the "FeedBook", which is an interactive exercise book for English as a foreign language. There are some scientific articles on their results online, if you're interested in that kind of thing.