[RFC] Remove Python 3.10 support in CI/CD

Similar to https://github.com/pytorch/pytorch/issues/161167

We want to start the process for removal of Python 3.10 from PyTorch CI and nightly builds.

End of Life for Python 3.10 is October 2026 (2026-10-31). Please see: https://devguide.python.org/versions/

According to our policy: https://github.com/pytorch/rfcs/blob/master/RFC-0038-cpython-support.md :

• Release during the release process of the last PyTorch release before the oldest version of python goes EOL.

PyTorch 2.15 is GA on 2026-10-28, immediately before Python 3.10 goes EOL on 2026-10-31, so 2.15 is the release thatremoves it.

Feature	Target Date
Announce Python 3.10 removal	Sept 2026
Remove Python 3.10 from nightly CD	Week of Sept 21, 2026
Remove Python 3.10 from nightly CI	Week of Sept 28, 2026
Release PyTorch 2.15 without Python 3.10 support	Oct 28, 2026

Both CD and CI removals land before the 2.15 release branch cut on Oct 5, 2026.

cc @malfet @pytorch/pytorch-dev-infra @albanD @ezyang

Versions

2.15