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The ratio of particles’ yield: π⁻/π⁺, K⁻/K⁺, /, and , and is measured as a function of pseudorapidity (η) in pp collisions at √s = 0.9 TeV using different hadron production models. The ratio measured in the three different transverse momentum (p_T) regions was: 0 < p_T < 0.8 GeV/c, 0.8 < p_T < 1.2 GeV/c and p_T > 1.2 GeV/c and at pseudorapidity regions of 3.0 < η < 4.5 and 2.5 < η < 4.5. The results are compared with measurements of LHCb experiment. The π⁻/π⁺ ratio from different MC generators at different transverse momentum and rapidity regions are in wholesome agreement with the measurements while K⁻/K⁺ and / ratios are in suitable agreement with data in some region of p_T and η, but mostly the models do not depict the data adequately. Similarly, for the different particle ratios, the model predictions and the experimental data have similar results in some regions, but …