Changing the default solver can be done in various ways:
One of the convenient ways to set default solvers is through gamsconfig.yaml file: https://www.gams.com/latest/docs/UG_Gam ... ommandLine
1. Windows: Run gamsinst.exe (present in the same file as gams.exe) from the command line and change the default solvers
2. Windows: Using the GAMSIDE: File → Options → Solvers. Click on the intersection of solver and model type that you want to be the default combination.
3. Unix: Run gamsinst again and change the default solver there.
4. Use a command line parameter, e.g. nlp=CONOPT
5. Add a line to your model (before the current solve statement) to switch your solver: option nlp=conopt. This will override all other settings and will tell GAMS to use GAMS/CONOPT to solve NLP models instead of the default NLP solver.
Note: Solvers, which call other solvers as a sub system (i.e DICOPT or SBB) may require an option file to change the default solver for the sub problem. Please refer to the solver documentation for more information.
Changing the default solvers FAQ
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