SHANGHAI, CHINA - DECEMBER 8, 2025 - A Tesla's humanoid robot Optimus displayed in a Tesla store in Shanghai, China on December 8, 2025. (Photo credit should read CFOTO/Future Publishing via Getty Images)CFOTO/Future Publishing via Getty ImagesTesla (NASDAQ:TSLA) continues to be a key player in the AI market with a market capitalization of $1.6 trillion, even though its primary electric vehicle division has seen stagnation. Conversely, the EV challenger Rivian Automotive (NASDAQ:RIVN) is starting to emerge ...