Models live in ToolPiper's Application Support directory and are downloaded on demand, never at install time. A fresh install ships no language, speech or embedding model; the only weights inside the app are a few small image models, far smaller than a single download, so what you use is what you store. Delete a model from the Models pane and the disk space comes back immediately.
Where they go
~/Library/Application Support/ToolPiper/
A partial download is not counted as installed and does not load; start it again from the Models pane.
How much space
It depends entirely on which models you install. A small speech model is a few hundred megabytes; a large language model quantized for local inference is several gigabytes. The Models pane shows the download size before you commit to it, and the on-disk size after.
If you are short on space, start with one language model and one speech model. You can add more later without re-downloading anything you already have.
Freeing space
Open the Models pane, select a model, and remove it. Removal deletes the weights and nothing else, and a removed model can be downloaded again later. A model adopted from another tool's library is removed from ToolPiper only; the other tool's copy is untouched.
Model assets are never pruned automatically. A background process that deleted weights you paid bandwidth for would be worse than running out of space, because the next thing you asked for would silently re-download.
Downloads that stall
Check that the download is not blocked by a VPN or a corporate proxy that inspects large transfers. ToolPiper fetches weights directly from the model host over HTTPS. If a download stalls, cancel it and start it again from the Models pane.