LP file format is designed to be human-readable, so Gurobi writes coefficients in LP files with fewer decimal digits. Also, the LP file format does not preserve the order of variables, so when you export a model in LP format and read it again, the solution path may be different. Gurobi writes MPS files with full precision and maintains variable order. Thus, LP format is best for debugging a model, and MPS format is best for future testing of a model.
What are the differences between LP and MPS file format?
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