The benefits of using the updated Accelerate library are (1) performance (xref gh-24053 for benchmarks) and (2) smaller wheels because we're no longer vendoring OpenBLAS.

The first part of this is done: after gh-24893 we are defaulting to the new Accelerate on macOS >=13.3 when building from source.

The second part is adding a new set of wheel build that use Accelerate rather than OpenBLAS on macOS >=14. Note that it can only be from macOS 14 rather than 13.3, because the packaging library (and hence pip) do not take macOS minor version into account, so using 13_3 in wheel names will lead to pip installing those also on 13.0-13.2 and those will then crash with missing symbols at runtime.

We need a macOS 14 image to build wheels (ideally, we could rename wheels manually in a pinch). The status of those CI images is:

• Cirrus CI made macOS 14 images available on the release date of macOS 14 three weeks ago. We want to use macos-sonoma-xcode (see here for all images). So we can do this now for arm64 wheels
• GitHub does not yet have a timeline for making runner images available. The tracking issue is Add macOS 14 (Sonoma) Runner Image actions/runner-images#7508. So for x86_64 we have to wait. I'd expect support to materialize well before the 2.0 release date.