Google says Gemini 4 Hydrogen is its biggest Search upgrade yet
Google has made Gemini 4 Hydrogen the default model in AI Mode and the one handling the hardest questions in AI Overviews, saying it copes better with complex, multi-part queries.
Why it matters: Google is making a new Gemini model the default engine behind AI Mode and AI Overviews, the AI answers that now sit in front of much of its search traffic.
Key points
- Gemini 4 Hydrogen is now the default model in AI Mode and handles the hardest questions in AI Overviews, according to Google Search VP Robby Stein.
- Google says the model breaks questions into parts, copes with typos and runs simultaneous queries across subtopics to return a wider range of links.
- It adds low, medium, high and a new xhigh thinking level, and Google says it matches or beats Claude Sonnet 5.5 and GPT-6.1 Terra.
Google says its new Gemini 4 Hydrogen model is the biggest model upgrade to Search yet, according to Robby Stein, the company's vice president of product for Search.
Google says the model handles complex requests better, including questions with several parts, hard-to-read typos and highly specific asks. It breaks a question down and answers each part, and runs simultaneous queries across related subtopics to offer a wider range of links. Responses also carry more visuals, such as images, comparison tables, graphs and maps, and Google says language understanding has improved across all supported AI Mode languages.
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