A lattice model for strongly interacting electrons motivated by a rank-3 tensor model provides a tool for understanding the pairing mechanism of high-temperature superconductivity.This Sachdev-Ye-Kitaev-like model describes the strange metal phase in the cuprate high temperature superconductors.Our calculation indicates that the superconducting gap ratio in this model is higher than the ratio in the BCS theory due to the coupling term and the spin operator.Under certain conditions,the ratio also agrees with the BCS theory.Our results relate to the case of strong coupling,so it may pave the way to gaining insight into the cuprate high temperature superconductors.