It predicts much more than what has been put in. The SM has 22 free parameters. I agree that if it predicted exactly 22 data points it'd be a pointless encoding of what was put in. But it predicts thousands and thousands of data points, some to twelve decimal points.

It predicts things as-yet-unseen, also, such as detailed proton structure, precision atomic matrix elements, detailed nuclear structure and decay rates, and so on.