Different results for same Model-Data in CPLEX 12.5 and 12.6

[Abhishek Agrawal]

Hi,

I am using a commercial version of CPLEX with AMPL. I am getting different results for the same model formulation and data while running it in CPLEX 12.5 and CPLEX 12.6.

To completely ensure that I am using the same data and model, I ran the model with CPLEX 12.5 and created ".nl" files for the formulation.

Now, I executed the same ".nl" file in CPLEX 12.5 and CPLEX 12.6. Ideally the results should be same or have a very slight difference, if at all. In my case, the difference was 62,857,501. The value of objective function in CPLEX 12.6 was lesser than CPLEX 12.5 by 12.1%

Is there some technical glitch with CPLEX 12.6? Should I contact the support team for CPLEX.

Thanks 

Abhi