Version 12.8 of CPLEX Optimization Studio is available for on Passport Advantage for commercial users, through the Academic Initiative program for academics and students, and as a trial version for all. Here are some of the most prominent changes:
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Performance improvements.
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OPL and the IDE available on MacOS.
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New callback framework in CPLEX.
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Objective bound for constraint programming.
Additional information can be found in this blog post, and in the release notes.