Through the use of first-principles calculations based on the density functional theory, we were able to investigate the structural, mechanical, electrical, optical, and thermodynamic aspects of antiperovskite compounds M3InC (where M=Y and La) (DFT). According to the experimental results, the optimised lattice parameters are in excellent agreement. The elastic property that was noticedThe constants are all positive, demonstrating the mechanical stability of all of these stages. Cauchy pressure, Pugh's ratio, and Poisson's ratio are all measures of pressure.The brittleness features of these compounds should be shown. For each of these stages, it is expected that there would be dislocation movement