Now, OpenAI has published its side of the story.
OpenAI's response is fairly short but quite devastating, as it contains several emails from Musk which indicate that he knew about OpenAI's plans to go for-profit, and that he suggested for the company to merge with Tesla.
OpenAI's blog post, authored by co-founders further claims that Musk wanted "full control" of the company.
https://openai.com/blog/openai-elon-musk