Does Sonic sell diet slushes?

Sonic does not sell diet slushes as part of its standard menu offerings. The slushes available at Sonic are typically made with real fruit flavors or syrups that do not have a specifically labeled "diet" version. Sonic focuses on providing a variety of flavors and options for customers, but its slushes are generally full-calorie and do not cater to diet-specific versions.

In the context of the other choices, while Sonic may have seasonal or promotional items, the standard menu does not include diet slushes. Thus, the answer aligns with the understanding of the brand's offerings and their general focus on full-flavor beverages.