Tesla Inc. (NASDAQ:TSLA) investors have long known Elon Musk‘s companies share talent and technology. But the EV maker‘s second-quarter earnings call suggested the relationship is entering a new phase, with Space Exploration Technologies Corp. (NASDAQ:SPCX) now playing an expanding role across Tesla’s AI models, robotics, satellite connectivity and semiconductor ambitions.

The comments suggest SpaceX is becoming more than a technology partner—it is increasingly part of Tesla’s roadmap for artificial intelligence.

SpaceX’s Grok is Becoming Part of Tesla’s AI stack

One of the biggest revelations came when Musk described how Tesla’s Digital Optimus project works.

“SpaceX’s Grok, sort of the big model that is the manager of Digital Optimus and tells Digital Optimus what to do,” Musk said while explaining Tesla’s effort to build a software version of its humanoid robot.

According to Musk, Digital Optimus allows Tesla to train AI systems to operate computers in much the same way Full Self-Driving software learns to operate vehicles. Grok provides the higher-level instructions, while Tesla’s AI systems execute those tasks in real time before those capabilities are transferred to physical Optimus robots.

The comments offered one of Tesla’s clearest explanations yet of how it plans to combine large language models with autonomous robotics.

The Partnership Goes Beyond AI

Musk said Tesla’s upcoming Cybercab will integrate Starlink connectivity, with plans to expand the satellite internet service to Tesla’s broader vehicle lineup where available. The goal is to ensure reliable connectivity for autonomous vehicles, particularly in areas where traditional cellular networks remain unreliable.

High-bandwidth connections could also enable passengers to stream entertainment or work while riding in autonomous vehicles.

Tesla also disclosed that it recently expanded its relationship with SpaceX through an investment and a new framework agreement, which executives said will support joint projects including Terafab and Digital Optimus.

A Bigger AI Ecosystem is Emerging

The collaboration doesn’t stop with software or connectivity.

Musk said Tesla’s proposed Terafab semiconductor initiative is aimed at developing advanced AI chips for Optimus, while also confirming SpaceX is involved in the effort. Separately, he described plans for AI “Megapods” that combine Tesla AI computers with conventional servers, allowing compute infrastructure to be deployed wherever electricity is available.

Taken together, the earnings call suggested Musk is building something larger than two separate companies sharing technology. Instead, Tesla increasingly appears to be leveraging SpaceX’s AI models, satellite network and engineering capabilities to accelerate its push into autonomous driving, robotics and AI infrastructure.

For investors, that could become one of the more important long-term takeaways from Tesla’s earnings. While quarterly results focused on vehicle sales and margins, Musk spent much of the call describing an ecosystem where SpaceX and Tesla are becoming increasingly interconnected as they pursue the next phase of AI development.

Photo Courtesy: Frederic Legrand – COMEO on Shutterstock.com