  As part of our ongoing lattice study of SU(3) gauge theory with two flavors
of fermions in the two-index symmetric representation (the sextet model), we
present the current status of the pseudoscalar particle spectrum. We use a
mixed action approach based on the gradient flow to control lattice artifacts,
allowing a simultaneous extrapolation to the chiral and continuum limits. We
find strong evidence that the pseudoscalar is a Goldstone boson state, with
spontaneously broken chiral symmetry and a non-zero Goldstone decay constant in
the chiral limit. In agreement with our study of the gauge coupling $\beta$
function, we find the sextet model appears to be a near-conformal gauge theory
and serves as a prototype of the composite Higgs BSM template.
