How to choose specific CPU types in AWS batch

This will depend on instance type and AMI. I launched a batch with optimal instance type and here is my output :

cat /proc/cpuinfo | grep 'model name' model name : Intel(R) Xeon(R) CPU E5-2686 v4 @ 2.30GHz model name : Intel(R) Xeon(R) CPU E5-2686 v4 @ 2.30GHz

May i know the instance type and AMI ( if not custom, with region) you are using ?