This is what we used to just call "standards", but apparently we need analogies now in order to explain standards to new developers.

Not only that, the P for "protocol" already gives that.

but it’s technically not a standard yet. Or not blessed as one by any neutral body or consortium etc.

It’s quickly becoming a de facto standard though, now that OpenAI has added it to their SDK.

It’s likely to be used to create a standard though (like with QUIC and HTTP3)

This is just an ontological issue. Is it a standard because it is designed to be one, or is it only a standard once it actually fulfills its role and is recognized as a standard? That's something we could debate all night. :)