Wizards and monks wear armour, now. Everyone does. Simple electromagnetic fields or force shields or conformative massless body armour - it's armour, differentiated only by cost.
Anthropic's 'Haiku', 'Sonnet', and 'Opus' appear to be synonyms for 'small', 'medium', and 'large', much in the same way Starbucks uses 'Tall', 'Grande', and 'Venti' for its branded coffee cup sizes.