Many apps (like dictation apps) ship with their own models totally separate from Apple Intelligence.
For example, Co-Typist [1] is very useful, but it requires a model installed with it, ranging from Gemma 3 1B at 0.8 GB to Gemma 4 26B A4B Pro at 15.7 GB. It recommended Gemma E2B (3.2 GB) for my 16 GB, M1 Pro MacBook Pro.
It works really well; the autocompletion is so good, it knows what I'm going to type before I do!
Here's the thing: you may not be aware of the amount of storage being used by models in various 3rd-party apps.
The open-source app What The Model [2] scans your machine and reports all the models it finds and gives you the total amount of storage being used.
[1]: https://cotypist.app