Google AI: Release Notes Gemini 3 and Gen UI in Google Search
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Dec 18, 2025 
Rhiannon Bell and Robby Stein, leads at Google Search, delve into the revolutionary integration of Gemini 3 and Generative UI. They discuss how models can now create bespoke, interactive simulations in real-time, transforming user experience. Rhiannon reveals the lightning-fast capabilities of Gemini 3 Flash, while Robby highlights the new Search persona designed for enhanced user engagement. They also explore innovative data visualizations like Nano Banana, making complex information more accessible and engaging for users.
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Frontier Model Power In Search
- Gemini 3 brings frontier reasoning and generation capabilities directly into Search at scale.
- That combination enables on-the-fly simulations, calculations, and richer answers for hard questions.
Model-As-Designer With Gen UI
- Generative UI lets the model design the response page, not just text, by using components and style specs.
- Designers encode layout rules as system instructions so the model makes consistent, design-aware choices.
Encode Design Rationale For The Model
- Give the model a component library plus design rationale system instructions to yield predictable, high-quality pages.
- Encode sizing, priority, and layout rules so the model can make context-aware layout decisions.