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The large-scale simulation of gasification using a highly resolved coke model is a powerful tool for predicting structural changes in metallurgical coke in a blast furnace. The objective of this study was to evaluate the accuracy of a numerical simulation using the results obtained from laboratory-scale gasification experiments. For the experiment, a cylindrical coke sample with a radius of 20 mm was gasified using CO2 gas at 1373 K in a coke gasification reaction furnace until the conversion reached 0.2. In addition, a numerical simulation of the coke model developed from X-ray computer tomography images of the coke sample before the reaction was conducted at 1373 K. Three low-resolution coke models were developed using the full-resolution coke model. The reaction rate and the coke structure after reaction were compared between the experiment and the numerical simulation. As a result, the prediction accuracies of reaction rate and structural change decreased with decreasing the image resolution as overall trend.