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.
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You are the strangest actual angel I have encountered. I bet their memory of the event is hilarious and foggy.