> Sam, Greg, Elon, Reid Hoffman, Jessica Livingston, Peter Thiel, Amazon Web Services (AWS), Infosys, and YC Research are donating to support OpenAI. In total, these funders have committed $1 billion
> Note that this is "committed $1 billion", not funded.
That same caveat could apply to any fund raised by a venture fund - usually funds are committed, and the actual capital call comes later (when the funds are ready to be spent).
It's an important caveat in some circumstances (e.g. it hinges on the liquidity of the funders, which may be relevant in an economic downturn), but in this one, I'm not sure it really makes a difference for this announcement.
Funny how they just slipped that in at the end