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A proven choice for highly nonlinear problems, CONOPT’s efficient and reliable multi-method architecture handles a broad range of models. Specialized techniques achieve feasibility quickly, while powerful preprocessing tools reduce problem size and suggest formulation improvements.
ampl: option solver conopt; # change the solver
ampl: option conopt_options 'option1=value1 option2=value2'; # specify options
ampl: solve; # solve the problem
Full list of solver options: