The 1 million $ Yang Mills problem..not answered for over 16 years
Perhaps the answer is ... The question is wrong.
Perhaps a better question is Is the SM model flawed?
"As explained in the official problem description set out by Arthur Jaffe and Edward Witten,
Yang-Mills theory is a generalization of Maxwell’s theory of electromagnetism, in which the basic dynamical variable
is a connection on a G-bundle over four-dimensional space-time.
Its quantum version is the key ingredient in the Standard Model of the elementary particles and their interactions,
and a solution .. would both put this theory on a firm mathematical footing and demonstrate
a key feature of the physics of strong interactions.
By contrast, there is at present no satisfactory mathematical definition of the quantum Yang-Mills theory,
because of the famous difficulties of renormalization..."
https://www.claymath.org/sites/default/files/ym2.pdf
In 150 AD the Library of Alexandria offered a prize of 10000 Denarii to prove
that Ptolemaic epicycles were mathematically sound.. unfortunately the ancient records of the prize winner have been lost