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I've been trying out o3 mini in Cursor today, it seems "smarter" but overall tends to overthink things and if it's not provided with perfect context it's prone to hallucinate. Overall I prefer Sonnet still. It has a certain magic of always making reasonable assumptions and finding simple solutions.

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As n occasions user and fan of Cursor, it would be good if they could explain what the models are and why the different models exist.

There’s no obvious answer of why one should switch to any of them!

I don’t think there’s an obvious answer. Try them out and see which works better for your use case.

Agreed that Sonnet still feels like the best all-round model. The new ones are at least on par with it for pure coding, or exceed it (r1, o1 both do IME) but don't generalize as well, especially to tasks with subjective answers. I find the latest Gemini 2.0-Flash-thinking to be closest to Sonnet on those.

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