Google said on 12 November that its new AI model, Gemini 4 Hydrogen, is now running in Google Search for all users worldwide. The company calls it the biggest model upgrade to Search so far. Google says Search now follows long, multi-part questions more closely, including ones with typos. Answers will show more images, comparison tables and custom tools. Google also says the model runs several searches at once across the subtopics of a question, a method it calls query fan-out. It says answers improve in all languages that AI Mode supports.
Google's announcement is the only source for these claims. It gives no test results, no usage numbers and no rollout schedule beyond saying the model is available now. It does not say how often the new answer formats will appear. It also does not say how many sites will get more or fewer visits from the wider linking it describes.
For people who run or build websites, Google says the new method links to a broader set of sites, including ones users might not have found before. Whether that sends more visitors to any given site is not yet shown. Teams that rely on search traffic may want to watch their own numbers after this change.