OpenAI Chief Executive Sam Altman said on Monday he has stepped down from the ​board of directors of Helion Energy, the fusion startup he ‌has backed since 2015, as the companies start ​to explore working together “at significant scale”.Altman, who is ⁠also on the OpenAI board, said the dual roles had become untenable as the ChatGPT maker eyes future partnerships with ‌Helion. In a post on social media platform X, Altman added that he will ‌have a financial interest in Helion and will recuse ‌hi...