AI is becoming the first thing between your customer and your business: it answers their search, takes their call, and even tries to book for them. Make your business easy for AI to read, and decide where it's allowed to act. Gemini 4 Hydrogen: default in AI Mode, used for hardest AI Overviews questions; broader links via query fan-out; more visual answers. Tip: clear service, area, price and FAQ pages.
What was reported
Google announcement, 12 November 2026 (Robby Stein, VP of Product, Google Search). Google calls it "the biggest model upgrade to Search yet". Available globally in Search for all users. Google says it handles multi-part questions, typos and highly specific requests better; its improved query fan-out connects people to "a broader range of helpful links than before", including sites they might not have found; and responses get more images, structured answers, comparison tables and custom tools.
Search Engine Journal reports Stein said it is now the default model in AI Mode and is used for the hardest questions in AI Overviews, and that it arrived two days into Google's November core update. Neither Google's post nor Stein's thread gives counts for links or sites (per SEJ). Hydrogen is also in the Gemini app, AI Studio, the Gemini API and Gemini for business; API price $1.50 per million input tokens and $7.50 per million output tokens (Google's figures).
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