SpaceX has already captured the near-term AI prize that Tesla is still chasing, thanks to a February merger with xAI that turned data centers into a revenue engine while Tesla remains in construction mode. Both companies operate under Elon Musk's direction but pursue opposite strategies: SpaceX rents compute capacity at premium rates from its Colossus data centers in Memphis, while Tesla invests heavily in building the semiconductor and AI infrastructure it needs for robotaxis and humanoid robots. The gap between their positions has sparked serious merger speculation, with prediction markets pricing an announcement by December 31, 2027, at roughly 47% probability.

Tesla's most recent quarter revealed the scale of its AI spending ambitions and the strain they're placing on finances. The company reported $28.24 billion in revenue alongside a 1.4% operating margin, but the real story was capital expenditure. Tesla's CapEx surged to $5.79 billion, up 141.81% year over year, while free cash flow flipped negative to negative $1.09 billion. Chief Financial Officer Vaibhav Taneja indicated this spending pattern will continue, stating CapEx will grow for "the next two or three years" across four major initiatives: Robotaxi expansion, Optimus humanoid robot development, a semiconductor fabrication plant called TerraFab, and AI compute infrastructure.

SpaceX's path to AI dominance looks fundamentally different. After absorbing xAI in February 2026, the company's Colossus data centers became its primary revenue driver, with the traditional launch business now playing a secondary role. SpaceX already rents compute capacity at premium rates because Grok, its large language model, has available capacity while competitors scramble to secure resources. The company committed to building AI infrastructure exclusively on Nvidia hardware, including a specialized Vera Rubin NVL72 variant designed for orbital deployment.

What Makes SpaceX's AI Strategy Different From Tesla's?

The two companies are essentially racing toward the same destination but from opposite starting points. SpaceX owns the immediate revenue stream; Tesla owns the longer-term physical opportunity. This fundamental difference shapes everything about their competitive positioning and risk profiles.

• Revenue Model: SpaceX generates immediate income from data center rentals and Grok compute services, while Tesla is in heavy investment mode with negative free cash flow and no near-term AI revenue stream.
• Hardware Strategy: Tesla is building TerraFab, a joint venture semiconductor fabrication plant in Austin, to produce AI5 and AI6 chips for its own use. SpaceX relies on Nvidia's existing hardware ecosystem, reducing capital intensity but increasing dependency on a single supplier.
• Timeline Pressure: SpaceX can monetize existing infrastructure immediately. Tesla faces execution risk on multiple fronts: FSD v15 must prove "ridiculously safe and capable," TerraFab must yield working silicon by mid-2027, and Starlink integration into Cybercab must actually ship.
• Market Skepticism: Prediction markets price the probability of a 2026 Optimus release at just 0.031, or roughly 3%, while California Robotaxi by year-end sits at 0.23, or 23%.

Tesla booked a $1 billion mark-to-market gain on its SpaceX holdings during the recent quarter, a quiet reminder that public shareholders already own a slice of both bets. This accounting detail underscores how intertwined the two companies have become in investor perception, even though they operate independently.

How to Evaluate Which Musk Company Wins the AI Race?

Investors and analysts watching this competition should focus on three specific execution milestones that will determine whether Tesla can close the gap or whether SpaceX's early lead becomes insurmountable.

• FSD v15 Safety Validation: Watch whether Tesla's Full Self-Driving version 15 achieves the safety and capability bar Musk has set. Current market sentiment on Reddit sits at 22, classified as bearish, driven by concerns about Cybercab performance and regulatory scrutiny from the National Highway Traffic Safety Administration (NHTSA).
• TerraFab Silicon Production: Monitor whether Tesla's semiconductor fabrication plant produces functional AI5 chips by mid-2027. This is the linchpin for scaling Optimus production without being constrained by external chip suppliers. Musk called TerraFab "a necessary" project to avoid bottlenecks in scaling the humanoid robot.
• Starlink Integration Success: Track whether Starlink connectivity actually integrates into Cybercab and ships to customers. This would represent a unique competitive advantage, providing autonomous vehicles with dedicated satellite connectivity independent of terrestrial networks.

The merger question looms over both companies. Musk has discussed combining Tesla and SpaceX openly, and he notably refused to kill the rumor during Tesla's earnings call, leaving shareholders to absorb the uncertainty. If a merger occurred, it would create a combined entity valued at approximately $3.4 trillion, consolidating Musk's AI, robotics, space, and energy ambitions under one corporate structure.

For now, SpaceX holds the clearer near-term advantage. It has compute generating revenue today, Grok managing digital operations, and Starlink monetizing connectivity. Tesla owns the bigger long-term opportunity if Optimus actually scales toward Musk's aspirational target of 10 million units annually, but that number sounds unrealistic given current development timelines and market skepticism. For public-market investors, Tesla trades at a price-to-earnings ratio of approximately 369, making it fundamentally a bet on execution rather than current earnings power.

The AI prize, for now, belongs to the private company. SpaceX's revenue-generating data centers and Grok services give it a structural advantage that Tesla cannot match until TerraFab produces silicon and Optimus reaches meaningful production volumes. The question is whether Tesla's massive capital expenditure and long-term vision can eventually overcome SpaceX's current lead, or whether the gap will only widen as SpaceX reinvests its AI compute revenue into further expansion.

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