Tesla invests $2 billion in Musk's xAI and reiterates Cybercab production starts this year ReutersTesla to invest $2 billion in xAI, Elon Musk's OpenAI competitor CNBCTesla Takes a Stake in xAI, Linking Fortunes of Musk Companies Barron'sTesla (TSLA) Posts Fourth-Quarter Profit That Beats Expectations Bloomberg