SE,we Mac users do not deserve this third class treatment!

[Mara-Eve]

The graphics API for OS X is OpenGL, Vulkan hasn't been released yet. Apple hasn't said anything about supporting Vulkan.

The (new!) graphics API for OS X is Metal: https://en.wikipedia.org/wiki/Metal_(Apple_API)

[Brianmj]

The (new!) graphics API for OS X is Metal: https://en.wikipedia.org/wiki/Metal_(Apple_API)

Yup, coming with El Capitan. It wont completely replace OpenGL as GL is built into OS X, but Apple can use Metal to accelerate a few apps, and libraries like Core Animation and Core Graphics. Those libraries will sit atop Metal. But your desktop, all those pixels will still be rendered by OpenGL. That 14 years of work Apple just can't throw away so easily.