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can a LLM knower explain to me what changes between "model names" (eg, Sonnet -> Opus -> Fable) and what changes between "model versions" (eg, 5 -> 5.5)? Like do the names represent fundamentally different parameter counts and the versions are more incremental improvements?

yeah roughly, although i would describe it more as size classes with intended usecases and pricing, these are fundamentally marketing terms that terra sort of disappeared from the luna-terra-sol-astra lineup had mostly to do with there not being a clear enough market for terra