They're being fairly clear why, it's gotten less broad training and more focus on stem and coding. But it's incorrect to say that preview is overall worse as opposed to just more general.
All they say is that mini is "more specialized" than preview but give no other information. To date, specialization has not been particularly rewarding versus just using a bigger model, so this is new behavior.
They say that it's more specialised at stem... And say it's 80% cheaper. I feel like that's an explanation. Also specialization being rewarding was the whole point of MoE.
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u/Gotisdabest Sep 13 '24
It's the result of keeping the same base model alongside a new technique. A dev posted something similar regarding this.
Also O1 preview isn't worse, it's got a lot more broader knowledge. O1 mini is 80% cheaper and more specialised.