After the xAI co-founders all left Musk, where did they go?
Some started their own ventures, others switched jobs.
In contrast, Tony Wu (Yuhuai Wu) has been quite pragmatic and very Chinese:
Buying a house in Silicon Valley.
Yes, you read that correctly. It's that Hangzhou-born 1995 guy who appeared on stage with his arm around Musk during the Grok 3 launch last year.
At 31 years old, he just splashed 500 million on a large house in the Bay Area... A life like that of a protagonist in a wish-fulfillment novel, effortlessly achieved!
So, what exactly happened?
Recently, the San Francisco Bay Area saw the highest-value residential transaction so far this year. Media traced the clues and found that the buyer pointed to xAI co-founder, Yuhuai Wu, "a young man working in AI."
Just last year, he purchased a top-tier residence for $12 million (approximately 80 million RMB).
Wow, he's really playing the real-life "Monopoly" · Tech Edition.
The transaction price is soaring like a SpaceX rocket. This wave, cashing out through xAI's historic IPO, is a huge win!
Bay Area's Most Expensive Mansion This Year: Goes to xAI's Chinese Co-founder
The newly purchased estate is located in Hillsborough, a traditional Silicon Valley affluent area. The property spans about 12 acres, with the main house covering approximately 12,000 square feet, plus a 4,600-square-foot guest house.
A tennis court, a nine-hole golf course, an eighteen-hole putting green, and a koi pond are just standard features. The estate also includes a 150-seat outdoor amphitheater, a 2,100-gallon aquarium, and a set of outdoor fountains modeled after the Bellagio in Las Vegas.
The property was initially listed for $88 million, reduced by $10 million, and finally sold on August 6th for $70 million (approximately 500 million RMB), becoming the largest residential transaction in Northern California so far this year.
In stark contrast to its jaw-dropping luxury, the buyer's identity was tightly concealed.
Public records show the property was purchased by a company named Daikon no Hana Capital. Registered just on July 9th, its manager is a lawyer specializing in estate planning.
And he "coincidentally" transferred Wu's previous $12 million home into a family trust just one week before the new estate deal closed.
Even more coincidentally, the buyer's agent had only handled one other major residential transaction in the past five years, which was precisely the house Wu bought in 2025.
With several clues pointing to him, the identity of the real buyer is almost undeniable.
But even before his real estate investments, Yuhuai Wu was earlier recognized in the AI circle for his work on reasoning models.
Yuhuai Wu was born in 1995 in Jiande, Hangzhou. He later went to the University of Toronto to pursue a Ph.D. in machine learning, studying under Roger Grosse and Jimmy Ba.
After his Ph.D., he conducted postdoctoral research at Stanford. His personal homepage states his research direction as "building machines that can reason."
Following this path, he participated in projects like the StarCraft AI AlphaStar, the self-taught reasoner STaR, the mathematical model Minerva, the geometry reasoning system AlphaGeometry, and worked or interned at OpenAI and Google.
Simply put, his focus is on making models generate reasoning steps, check the process, and continue learning from their own reasoning results.
And this research direction is precisely the current competitive frontier in large language models.
In 2023, Musk formed xAI, and Yuhuai Wu, along with his advisor Jimmy Ba, joined as one of the 12 co-founders. By the time Grok 3 was launched, he was already a core figure in the reasoning team.
Grok 3's key feature of "Think, then answer," and its methods for backtracking, verification, and long-chain reasoning, are all productized implementations of his years of research.
Until this past February, after xAI was merged into SpaceX, Wu announced his departure. A day later, his advisor Jimmy Ba also announced his exit.
At that time, Wu stated his reason:
Next, I will explore a new chapter in life, and I believe a small team armed with AI can move mountains.
Half a year later, there's still no news about a new company, but the equity accumulated at xAI has once again sparked heated discussion, this time in the form of a mansion.
xAI's Wealth Creation
The merger of SpaceX and xAI earlier this year, in hindsight, indeed achieved a 1+1>2 effect.
The bundled IPO set a new historical record, and the equity stakes of the original co-founders multiplied several times over.
U.S. securities filings disclosed that through conversion, each xAI share corresponds to 0.7165 shares of SpaceX. Based on the closing price on the first day of trading, its value was approximately $115.32.
This is about 53% higher than the $75.46 per share cash option SpaceX offered to some eligible individuals at the time of the merger.
However, Wu's specific shareholding quantity has not been made public. How much he cashed out remains unknown.
But judging by his current extravagant spending, it's clearly substantial, especially considering the immense wealth creation scale of SpaceX itself.
According to media calculations, more than 4,400 current and former employees became millionaires through the IPO, with about 400 holding stakes valued over $100 million.
And such wealth leapfrogging stories are now a daily occurrence in Silicon Valley.
Once Anthropic and OpenAI successively go public with IPOs, more top AI talent will achieve asset leaps through equity acquisitions and super IPOs.
This cohort of frontline researchers is rapidly becoming the protagonists in Silicon Valley's new wealth map.
The most direct reflection of this change is Bay Area housing prices:
They have been steadily climbing, rising by 14% in just the past year.
References:[1]https://sfstandard.com/2026/08/12/xai-cofounder-hillsborough-buyer/[2]https://xhslink.cn/o/6g6pj41mkne[3]https://www.linkedin.com/in/yuhuai-tony-wu-02a641b5/[4]https://yuhuaiwu.github.io/
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This article is from the WeChat public account "QbitAI," author: Focus on Cutting-edge Technology
