The OpenID protocol that is used by Stack Exchange websites has been obsolete for a while.
Is it going to be upgraded to something that is not obsolete? OpenID Connect comes to mind.
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With the current global login system, the only thing SE really needs OpenID (or anything similar) for is people who log in using external credentials from Google / Facebook / etc. (and also a few historical special cases like SEDE, but those really should be fixed anyway).