The naming of this stuff is so bad. Hydrogen (1) is dumber than Carbon (6), sure. But Carbon (6) is smarter than Argon (18)!
The labs use a pretty clear progression: Luna -> Terra -> Sol -> Astra; Haiku -> Sonnet -> Opus -> Fable/Mythos. Google doesn't make it easy.
Anthropic, OpenAI and literally everyone else's naming schemes are in the same class of silly. The regurgitated complaints on every single thread are really getting tired.
Claude is the same really. Fable is a short story, so makes no sense in this hierarchy, and Opus have to think it as derived from "Magnum Opus" to make sense, else Opus by itself simply is a piece of music by a composer and would've been more appropriate for low-reasoning model to be used by sub-agents.