Elon Musk seems tired and cranky. On Thursday, he took the stand for the third day in a four-week trial stemming from his lawsuit alleging that OpenAI abandoned its mission and should be blocked from taking the company public later this year. If Musk plays his cards right, Sam Altman could be ousted and OpenAI would remain a nonprofit forever.

Elon Musk fired back at OpenAI’s lawyer in a tense cross-examination during the second day of the long-awaited trial that pits one tech billionaire against another.

Elon Musk on Tuesday testified that his lawsuit against OpenAI and its leaders goes well beyond one company and into the future of a technology that “could also kill us all.”

Despite a series of positive developments, Tesla stock might still be too expensive to buy right now.