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OpenGL is still supported on macOS, though its use is discouraged. (This is what Apple means when it says it's "deprecated".)

Apple's OpenGL implementation has always been mediocre even when it was technically supported.

Last time I had to use it, it had an old version and was missing some features, disallowing use of compute shaders.

OpenGL on macOS has been stuck on 4.1 + some 4.2 extensions since 2012 IIRC.