The evolution of properties and interactions of elementary particles is described, beginning with the Planck scale of 1019 GeV. The description is based on the hypothesis that the high-temperature (high-energy) limit of the Standard Model is generated by the gauge group contraction. In the infinite-temperature limit, properties of particles fundamentally change: all particles lose their masses, and only massless neutral bosons and quarks together with neutrinos and photons survive. Weak interactions become long-range ones and are generated by neutral currents. Quarks have only one color degree of freedom.