How mini is o3-mini compared to Sonnet and why does it matter whether it's mini or not? Isn't the point of the demo to show what's now possible that wasn't befo

How mini is o3-mini compared to Sonnet and why does it matter whether it's mini or not? Isn't the point of the demo to show what's now possible that wasn't before? 4o is cheaper than o1 mini so mini doesn't mean much for costs.