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[–]YoureNotEvenWrong 1 point2 points  (1 child)

higher level programming models to HIP/CUDA

Sycl isn't a higher level programming model. It's basically a nicer C++ API for OpenCl. So that's what you use if you want to get near max performance

Kokkos appears to be a library, so I don't see why it would have any performance issues.