From their site:
OpenAI is a non-profit artificial intelligence research company. Our goal is to advance digital intelligence in the way that is most likely to benefit humanity as a whole, unconstrained by a need to generate financial return.
The money quote is at the end, literally—$1B in committed funding from some of the usual suspects.
Nate Soares says there will be some collaboration between OpenAI and MIRI:
https://intelligence.org/2015/12/11/openai-and-other-news/