Sam Altman called Elon Musk a “bully” for his continued criticism of and several lawsuits against OpenAI, the organization they cofounded in 2015. OpenAI released an extensive blog post on Dec. 13 to back up its claim that Musk always wanted OpenAI to be a for-profit organization.

Altman said he believes much of Musk's animosity is rooted in OpenAI's recent success and the fact that he now runs a direct competitor.