Google Search Upgraded With Gemini 4 Hydrogen Model for All Users

摘要

Google has made Gemini 4 Hydrogen available globally in Google Search for all users.
Google calls it the biggest model upgrade to Search yet.
Hydrogen is the new default model in AI Mode and is used for the hardest questions in AI Overviews.
Google lists four improvements: intent understanding, query fan-out and linking, visual responses, and language understanding.

The Upgrade

Google Search has received a major upgrade with Gemini 4 Hydrogen, according to Google. The model is now available globally in Google Search for all users, delivering more helpful, visual, and intuitive responses with improved model capabilities.

Nick Fox of Google wrote on X, "Today, Search is getting a massive upgrade with Gemini 4 Hydrogen! It’s the biggest model improvement to Search yet. And it’s available now for all users, globally."

Robby Stein of Google wrote on X, "The biggest model upgrade to Search yet has landed. Gemini 4 Hydrogen is here, and brings cutting-edge intelligence to all Search users. It’s now the new default model in AI Mode & being used for your hardest questions in AI Overviews."

What Google Says Is Better

Google lists four areas of improvement:

Better understanding of intent: Search can now handle more nuanced and complicated questions, including questions with multiple parts, hard-to-understand typos, or highly specific requests. With deeper instruction following and tool calling, Search more precisely follows what users want and gives relevant responses that address each part of a question.
Improved query fan-out and linking: Hydrogen’s advanced reasoning supercharges query fan-out in Search, connecting users to a broader range of helpful links than before. By more thoroughly understanding a question and conducting simultaneous queries across all relevant subtopics, Search helps users find sites they previously might not have discovered.
More visual responses: Users get highly adaptive, visual, and easy-to-scan responses that are uniquely relevant to their needs, including more images, structured responses, comparison tables, and custom tools built for them.
Richer language understanding: No matter what language users ask in, they will now get more highly nuanced and helpful responses across all supported AI Mode languages.

Context

Earlier this week, Google released Gemini 4 Carbon for paid subscribers in AI Mode in Google Search. The Hydrogen release follows just days later. Google also said Hydrogen is now the new default model in AI Mode and is being used for the hardest questions in AI Overviews.

Why it matters

The upgrade changes how Google Search answers complex questions and which websites appear in AI-generated responses. Because the model is available to all users globally, not just paying subscribers, it affects the broadest possible audience for Search and the publishers whose pages are cited in AI answers.

来源（英文）

本文由人工智能翻译自英文原文，并经过自动审核，确保与原文意思一致。来源已用英文核实。

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