[oggreen]

I use Sonnet 80% of the time when I'm on claude.ai and on Claude Code my main agent is Opus and typically my sub-agents are Sonnet.

I use this setup mainly because I genuinely don't know if anything I'm doing is complex enough to need Fable and I don't want to run up my usage too much. It's basically like trying to kill a gnat with a sledgehammer. Hell, at work Haiku almost always works just as well as Sonnet does and its much cheaper/faster. It does seem to struggle with complex structured outputs however.

The only time I've really used it (and I've been genuinely impressed) is when I'm trying to get structure for something that's abstract.

So I wouldn't say I prefer any of them, just that I try to match them with how complex my use case is.