A leading free solver that has evolved from a large-scale optimization project at the University of Edinburgh. HiGHS is open-source software to solve linear programming, mixed-integer programming, and convex quadratic programming models.

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How to use it

ampl: option solver highs; # change the solver
ampl: option highs_options 'option1=value1 option2=value2'; # specify options
ampl: solve; # solve the problem


Full list of solver options: