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> XL

Extra Large? 40 times?

What? XL is the current version of Stable Diffusion.

It's already on version 40?

Extra large

It’s a Roman numeral joke.

Not a very good one.

1024 x 1024 instead of 512 x 512.

XL more likely refers to the parameter count, which is 3 billion instead of <1 billion

No, I think it is mainly because it's optimized for 1024 x 1024 images, rather than 512 x 512 as the previous version was.

It’s both. More pixel space and more parameters.