Isn't PIX a payment scheme?
replyOpen banking is slightly different, as it's more about account access (although with read+write access, you can kind of build it into a payment scheme as well, although it's usually clunky).
You're right, they are actually one step ahead and into what is now called Open Finance and aims at extending Open Banking beyond the original vision.
replyThe brazilian central bank has a page about it[1]
[1] https://www.bcb.gov.br/estabilidadefinanceira/openfinance