The antonyms for the phrase "are same class as" would be any term that implies a difference in class or status. Some potential antonyms include "are of a lower class than," "are inferior to," or "are separate from." These terms indicate that the subject in question is not on the same level as their counterparts or does not belong in the same category. Conversely, antonyms could also include phrases like "are superior to," "belong to a higher class than," or "are distinct from," which emphasize differences in status or quality between two subjects. Ultimately, the antonyms for "are same class as" depend on the context in which the phrase is being used and the specific qualities being compared.