https://openai.com/blog/openai-lp/

We’ll need to invest billions of dollars in upcoming years into large-scale cloud compute, attracting and retaining talented people, and building AI supercomputers.

We want to increase our ability to raise capital while still serving our mission, and no pre-existing legal structure we know of strikes the right balance. Our solution is to create OpenAI LP as a hybrid of a for-profit and nonprofit—which we are calling a “capped-profit” company.

Going forward (in this post and elsewhere), “OpenAI” refers to OpenAI LP (which now employs most of our staff), and the original entity is referred to as “OpenAI Nonprofit.”