Gemini's Momentum

The Reasoning Race Accelerates

Gemini 2.5 Pro Experimental set the stage in March 2025¹. It topped the LMArena leaderboard, scored well on Humanity's Last Exam, and paired step-by-step prompting with native multimodality. Flash and Flash-Lite followed that spring. Google I/O 2025 made 2.5 Flash the default across consumer products. Gemini 3 Pro changed the design itself in November. A sparse mixture-of-experts model turns on only a fraction of its parameters per query, which holds the cost down as context windows stretch to a million tokens. December finished the family with Gemini 3 Deep Think and Gemini 3 Flash, giving Google a three-tier lineup inside a single month.

Nano Banana proved the point early. Gemini's image feature pulled more than 10 million new users into the app within weeks of its August 2025 launch¹. One feature moved how people behaved, which told Google its research gains reach past a test score. The company used that lesson again at I/O 2026³.

Chips sit under all of it. Google's seventh TPU, Ironwood, entered production tuned for inference at scale rather than training alone. That matters once a company serves reasoning models with million-token contexts across hundreds of millions of daily queries. Custom chips give Google a cost base rivals renting silicon struggle to match, and the edge grows each time the release schedule tightens.

Search Learns to Act

Google I/O 2026 pushed that reasoning into the product Google depends on most. Search Agents and Generative UI replaced fixed results with pages that build themselves around a query and finish multi-step tasks³. The event treated it as central, rather than as a test. Google also showed Gemini 3.5 Flash, Gemini Omni, which makes video from any input, and a feature called Gemini Spark². A Universal Commerce Protocol carried the same logic into payments, letting a Gemini agent buy a thing rather than suggest it. AI audio glasses built with Samsung, Warby Parker and Gentle Monster landed on a fall 2026 schedule.

Read together, the announcements show Google making agents a product requirement on every surface it controls. That differs from running one chatbot and racing on test scores. Search Agents puts Gemini's reasoning inside the revenue Google has guarded since the 1990s. Call it a bet that agent search holds ad and shopping money better than a fixed results page, under pressure from ChatGPT and Perplexity.

Dean's Exit and the Discovery Loop Bet

Jeff Dean's exit landed with weight matching his tenure⁴. Google's chief scientist and 30th employee left the company he helped build. His work runs through Search infrastructure and Gemini alike. Three senior colleagues went with him: Sanjay Ghemawat, a senior fellow and one of Google's most decorated engineers; Quoc Le, a founding member of Google Brain; and Oriol Vinyals, a senior research scientist at Google DeepMind.

Their venture, Discovery Loop, set up as a public benefit corporation built to automate experiments⁴. Its own announcement names the problem. "While science and engineering have tremendously advanced society over past centuries, progress has traditionally relied on slow, sequential human iterations, creating a significant bottleneck." The founding team put the ambition in one line. "The next great frontier for AI is to go beyond answering questions and to begin making discoveries."

Dean explained the mechanism to The New York Times. "We think there is opportunity for AI to more fully automate what has traditionally been a very human-intensive experimental loop. You will get both a higher quantity and a higher quality of experiments, and that will lead to scientific breakthroughs and advances."⁴ Read the word he repeats. Experiments, twice, and quantity before quality. That is a claim about volume rather than insight.

Radical Ventures and Khosla Ventures co-led the funding, with Kleiner Perkins, Lightspeed and Doerr Capital joining⁴. Alphabet backed the venture its own researchers had just left. That detail cuts against reading the exit as hostile. A company that invests in the firm its former chief scientist founded has negotiated a spinout, rather than failed to stop a defection. Demis Hassabis stays atop Google DeepMind as chief executive, steering Gemini through the exact months Dean's team chose to go. Three days past earnings, four researchers at once. That reads as a planned handoff.

Reading the Two Timelines Together

Google's product pace and its talent churn ran on one calendar, toward different ends. Gemini 3 Pro shipped in November¹. Search Agents shipped in May³. Discovery Loop launched in August⁴. Roughly ninety days separate each, far tighter than the multi-year gaps that once split major Google AI news. Dean's team leaving inside that pace, rather than before or long after, suggests the research group hit a handover point, where the generation Dean stood for passed the work to whoever comes next under Hassabis.

Alphabet funding Discovery Loop, rather than fighting it, points at a calculation. Keeping the relationship alive through an investment costs less than losing access to Dean's future work. Google may also gain a discovery partner it would otherwise spend years building in house. Whether the math works turns on one thing. Discovery Loop has to produce results different enough from Google's own to justify the deal, and only published findings will show that.

Demis Hassabis made the case for Google's depth before Dean's exit became public. He told Semafor at the Cannes Lions Festival in June 2026 that departures land on a bench deep enough to absorb them. "We have by far the biggest and broadest research bench of any of the labs out there. We win our fair share of the top talent," Hassabis said⁵.

Gil Luria, an analyst at D.A. Davidson who recommends holding Alphabet stock, reads the same exit as proof that compensation alone misses what the departing researchers actually want. He told CNBC the day Dean's move became public that the pull runs toward legacy over revenue. "They're not interested in commercializing AI," Luria said. "They're interested in being part of history, and so they look at Anthropic, OpenAI or another startup as being the place where they can pursue history," he said⁶.

By the numbers

• One million: the maximum input tokens Gemini 3 Pro handles natively, per its Nov. 18, 2025 launch¹.
• Three Gemini 3 variants, Pro, Deep Think and Flash, shipped across a single month from November into December 2025¹.
• Ten million new Gemini app users arrived within weeks of Nano Banana's August 2025 launch¹.
• May 19 and 20, 2026: the dates of Google I/O, where Search Agents and Generative UI debuted³.
• Four senior Google researchers, led by Jeff Dean, left on Aug. 5, 2026 to found Discovery Loop⁴.
• Employee number 30: Jeff Dean's place at Google, across a tenure of more than two decades⁴.

What to watch

Discovery Loop's first published results test whether Dean's team can show automated discovery at the scale its pitch promises⁴. That is a different bar from any leaderboard. Gemini's Search Agents rollout, watched through complaints and uptake over the rest of 2026, will show whether Google turned a design lead into a product buyers trust with money³. Hassabis's next public roadmap would show how DeepMind plans to replace what Dean, Ghemawat, Le and Vinyals took with them.

Sources

1. Wikipedia contributors, "Gemini (language model)," Wikipedia, accessed Sept. 4, 2026, https://en.wikipedia.org/wiki/Gemini_(language_model)
2. Wikipedia contributors, "Gemini (chatbot)," Wikipedia, accessed Sept. 4, 2026, https://en.wikipedia.org/wiki/Gemini_(chatbot)
3. Wikipedia contributors, "Google I/O," Wikipedia, accessed Sept. 4, 2026, https://en.wikipedia.org/wiki/Google_I/O
4. Lucas Ropek, "Jeff Dean and other top AI researchers are leaving Google to launch their own startup," TechCrunch, Aug. 5, 2026, https://techcrunch.com/2026/08/05/jeff-dean-and-other-top-ai-researchers-are-leaving-google-to-launch-their-own-startup/
5. Reed Albergotti, "Exclusive: DeepMind Chief Demis Hassabis Says Google's Still Winning AI Talent," Semafor, June 24, 2026, https://www.semafor.com/article/06/23/2026/deepmind-chief-demis-hassabis-says-googles-still-winning-ai-talent
6. MacKenzie Sigalos, "Google is expanding its AI empire — and losing the people who built it," CNBC Africa, Aug. 6, 2026, https://www.cnbcafrica.com/2026/google-is-expanding-its-ai-empire-and-losing-the-people-who-built-it