Tech

Google cofounder Sergey Brin shares why he's back at the company 'pretty much every day now' to work on AI

Sergey Brin
Google cofounder Sergey Brin played a key role in the development of Google's Gemini AI model. Kelly Sullivan/Getty Images
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Google cofounder Sergey Brin made a surprise appearance onstage at the company's flagship I/O developer conference Tuesday, where he explained why he's returned to the tech giant and what he's learned from the failure of Google Glass over a decade ago.

It's the latest sign that Google is going hardcore on AI. Brin has been back at Google to help develop its AI products since 2023 as the search giant races against OpenAI's ChatGPT, and he shared about what he's been up to since returning to the trenches.

Brin wasn't expected to speak at the talk, which Google billed solely as an interview of its DeepMind CEO Demis Hassabis. He joked, "I torture people like Demis, who is pretty amazing. He tolerated me crashing this fireside."

In the chat with Hassabis, Brin said he comes into Google "pretty much every day now" to chip in on training the latest models from Gemini. It's something that naturally interests him, the famously technical co-founder said.

"I tend to be pretty deep in the technical details," Brin said. "And that's a luxury I really enjoy, fortunately, because guys like Demis are minding the shop. And that's just where my scientific interest is."

Since returning to Google, Brin also attended last year's I/O, where he fielded reporters' questions about AI.

Learning from Google Glass

At the 2012 Google I/O conference, Brin famously demoed a video in which he wore Google Glass while skydiving to show off the tech giant's previous foray into wearables. This year, he also addressed Google Glass, which it stopped selling a decade ago.

At the Tuesday fireside, Brin said Google Glass's failure stemmed partly from his lack of knowledge about manufacturing and supply chains.

"I just didn't know anything about consumer electronic supply chains, really, and how hard it would be to build that and have it at a reasonable price point," he said.

Brin is far more bullish on Google's latest wearables venture: "XR," or Extended Reality, glasses. At the fireside chat, he said he thinks AI is far more capable now for such a product.

Business Insider was able to snap a picture of the normally reclusive billionaire trying the XR glasses on before the fireside chat, too:

Google cofounder Sergey Brin at Google I/O in 2025
Brin trying on XR glasses at I/O in 2025.  Charles Rollet / Business Insider

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Charles Rollet
Charles Rollet is Business Insider's tech correspondent in San Francisco, where he focuses on breaking major news about the AI industry. In 2025, he led an investigation which revealed that Scale AI had inadvertently exposed confidential data about its workers and clients. In 2026, he was the first to break the news that Meta had halted a controversial keystroke tracking program.Prior to joining BI, Charles worked at TechCrunch covering startups and VC in San Francisco. Before that, he was based in Southeast Asia for a decade, where his work won a Gerald Loeb award and was nominated for a Society of Publishers in Asia award. His reporting on the surveillance industry led to US human rights sanctions on five Chinese security camera manufacturers.Charles is especially interested in how frontier AI models are built and trained. He has a master's degree in business reporting from NYU and a bachelor's degree in history from Northwestern.You can contact Charles securely on Signal at charlesrollet.12 or +1-628-282-2811. Charles keeps sources anonymous. Please use a non-work device to reach out.