Gurobi v9.0.

Now including elevator music!


 Major new features:

• Non-convex quadratic solver
• Supports non-convexities both in objective and constraints
• Not quite sure if MIQCP is supported (I assume it is, but I think this was not mentioned explicitly)
• Cplex had already support for (some) non-convex quadratic models, so Gurobi is catching up here.
• Performance improvements
• MIP: 18% faster overall and 26% on difficult models (more than 100 seconds)
• MIQP: 24% faster
(these numbers are from the email I received -- not from the movie). Quite impressive numbers. Performance does not seem to plateau (yet). Of course we see this also for Cplex: it keeps improving. There is some healthy competition here.

References

1. What's New (for Gurobi), https://www.gurobi.com/products/gurobi-optimizer/whats-new-current-release/
2. 2019-11 - INFORMS Seattle - Whats new in CPLEX 12.10, https://ibm.ent.box.com/s/81yeflq972r6gmhckobl403pwwpuih4a