They're a Public Benefit Corporation but not a non-profit, which means they don't have to file those kinds of documents publicly like 501(c)(3)s do.

I asked Claude and it ran a search and dug up a copy of their certificate of incorporation in a random Google Drive: https://drive.google.com/file/d/17szwAHptolxaQcmrSZL_uuYn5p-...

It says "The specific public benefit that the Corporation will promote is to responsibly develop and maintain advanced AI for the long term benefit of humanity."

There are other versions in https://drive.google.com/drive/folders/1ImqXYv9_H2FTNAujZfu3... - as far as I can tell they all have exactly the same text for that bit with the exception of the first one from 2021 which says:

"The specific public benefit that the Corporation will promote is to responsibly develop and maintain advanced Al for the cultural, social and technological improvement of humanity."

B corps are really just a marketing program, perhaps at best a signal to investors that they may elect to maximize a stakeholder model, but there is no legal requirement to do so.