SYCL and oneAPI
SYCL takes a different route to portability than HIP's near-identical-API strategy: instead of translating CUDA calls one-for-one, it's a Khronos standard for expressing host and device code in single-source, standard C++, with the compiler splitting host and device parts of the same file at compile time. The same .cpp file that launches a kernel also defines it, using ordinary lambdas and templates instead of a separate kernel language. oneAPI is Intel's product built around SYCL — a toolchain, a compiler, and a set of libraries — but SYCL itself is vendor-neutral and has multiple independent implementations.