Al Root

Elon Musk's Macrohard is more than poor wordplay on Microsoft. It's a new business for Tesla, trying to become what Amazon Web Services is to Amazon.com.

On Wednesday, Musk made the announcement. "Macrohard or Digital Optimus is a joint xAI-Tesla project, coming as part of Tesla's investment agreement with xAI," he wrote on X. "This will run very competitively on the super low cost Tesla AI4 ($650) paired with relatively frugal use of the much more expensive xAI Nvidia hardware. And it will be the only real-time smart AI system. This is a big deal."

It's a big deal for a few reasons. For starters, it's another example of AI products trying to improve productivity. It's also a sign that Musk's companies are moving closer together. Tesla invested in its AI company, xAI, late last year, and Musk's rocket company, SpaceX, acquired xAI earlier this year.

AI unifies the three companies. xAI has its Grok models. SpaceX hopes to put AI computing in orbit. Tesla is working on putting AI into physical objects such as cars and robots. Announcements such as Macrohard drive hope, held by some investors, that Musk will merge everything into one multi-trillion megacorporation.

Macrohard running on Tesla AI4 chips is the third reason investors should pay attention. Many of those chips are inside Tesla vehicles, doing things such as running autonomous driving features. But Tesla vehicles aren't always driving, and the computers sit idle. Digital Optimus assistance can leverage that computing power when it isn't needed.

"I think there's also some potential here for an AWS element down the road," said Musk in 2024, pointing out that Teslas had a very powerful computer inside of them. "I think it's analogous to Amazon Web Services, where the people didn't expect that AWS would be the most valuable part of Amazon when it started out as a bookstore."

AWS generated $129 billion in 2025 sales, up 20%, and almost $46 billion in 2025 operating profit, nearly 60% of Amazon's total operating profit.

Tesla's AI agent is "a shot across the bow in the tech world," said Wedbush analyst Dan Ives. "This is the AI story morphing at Tesla. A big step forward."

Tesla stock was up 0.2% at $408.75 in early trading on Thursday, while S&P 500 and Dow Jones Industrial Average futures were down 0.4% and 0.5%, respectively. Tesla stock rose 2.2% on Wednesday, the day Musk announced Macrohard.

Write to Al Root at allen.root@dowjones.com

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March 12, 2026 07:16 ET (11:16 GMT)

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