Tesla vs SpaceX: Elon Musk’s Two Companies Are Chasing the Same AI Prize. Only One Is Positioned to Win It
Alex SiroisMon, September 7, 2026 at 2:49 PM GMT+3 4 min read
Quick Read
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Tesla posted $28B in revenue at a 1.4% operating margin while CapEx surged 141% and free cash flow turned negative.
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SpaceX already rents compute at a premium through Grok while Tesla builds TerraFab, giving the private company the clear near-term AI advantage.
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Polymarket prices Optimus's 2026 release at just 3% and California Robotaxi at 23%, yet TSLA trades at a P/E of 369.
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Tesla (NASDAQ: TSLA) just closed a bruising quarter that put its AI ambitions on full display, reporting $28.24B in revenue alongside a 1.4% operating margin. SpaceX, still private, reported its own results in early August. Both Musk companies are chasing the same AI prize from opposite directions: Tesla on the ground, SpaceX in orbit and inside data centers. Only one currently owns the compute.
Ground Robots Versus Orbital Compute
Tesla's quarter was a spending story. CapEx surged to $5.79B, up 141.81% year over year, and free cash flow flipped to negative $1.09B. CFO Vaibhav Taneja said CapEx will grow for "the next two or three years" across Robotaxi, Optimus, a semiconductor fab, and AI compute. Robotaxi expanded to seven U.S. metros, and active FSD subscriptions reached 1.48 million, up 56% YoY.
SpaceX's AI angle is different. After merging with xAI in February, its Colossus data centers in Memphis became the revenue engine, with the launch business (still only roughly $4 billion) increasingly a side act. SpaceX also committed to building AI infrastructure exclusively on Nvidia, including a Vera Rubin NVL72 variant designed for orbit.
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Business Driver
Tesla
SpaceX
AI Revenue Engine
FSD subscriptions, future Robotaxi fleet
Data center rentals, Grok compute
Hardware Bet
Optimus, Cybercab, AI5/AI6 chips
Starlink, Starship, Nvidia-based clusters
Cash Profile
Negative FCF, $43.5B cash
Heavily shorted, private valuation ~$3T
One Owns Compute Today. One Is Still Building It.
This is where the strategies diverge sharply. SpaceX already rents compute at a premium because Grok has capacity while rivals scramble. Tesla is still constructing the picks-and-shovels. Musk called TerraFab "a necessary" project to avoid being constrained in scaling Optimus by a lack of AI chips. Optimus itself faces skepticism: Polymarket puts the probability of a 2026 release at just 0.031. California Robotaxi by year-end sits at 0.23.
Tesla booked a $1 billion mark-to-market gain on its SpaceX holdings, a quiet reminder that shareholders already own a slice of both bets. Merger chatter is louder than execution: the strongest Polymarket outcome, an announcement by December 31, 2027, prices at 0.465.
What Decides the Prize in 2027
Reddit sentiment on Tesla is sitting at 22, bearish, driven by a viral post titled "Tesla Cybercab Flops, Elon Ghosts, NHTSA Knocks: TSLA Dropped 6%". Three things to watch: whether FSD v15 hits Ashok's "ridiculously safe and capable" bar, whether TerraFab yields working AI5 chips by mid-2027, and whether Starlink integration into Cybercab actually ships.
Why I Lean Toward SpaceX for the AI Prize, and Tesla for the TAM
Both cases have merit. SpaceX has the clearer near-term software and infrastructure path following the xAI absorption: compute already earning revenue, Grok managing Digital Optimus, and Starlink monetizing connectivity. Tesla owns the bigger physical-AI opportunity if Optimus actually scales toward Musk's aspirational 10 million units a year target, but that number sounds cartoonish today. For public-market investors, TSLA at a P/E of ~369 is a bet on execution. Key execution milestones include Robotaxi crossing a million autonomous miles cleanly and TerraFab producing first silicon. Until then, the AI prize belongs to the private company.
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