Adding a popup/hover window that provides details on each model when selecting it would be very helpful. Raycast does this very well:
Perhaps there are other Kagi specific items you could add. In Discord there was talk about token usage metrics, perhaps model specific metrics can be shown in this pop up. Another useful piece of info could be a "This model is best used for" statement.
Having this type of information provided expands your user base. Currently your user needs to be informed on all the available models to make sue of the concept of having models to choose from. To a user not knowledgeable this becomes a barrier to use, they don't know what model to choose or why. It becomes hard to use the product for this user.