Google has deployed its new Gemini 4 Hydrogen model as the default for handling complex questions in AI Mode and AI Overviews, according to Robby Stein, VP of product at Google Search. The model became available November 12 across Google Search, the Gemini app, all tiers of Google AI Studio, the Gemini API, Gemini for business, and Google Antigravity for Google AI Pro and Ultra subscribers.
Google says the model addresses questions with multiple parts, typos, or highly specific requests by breaking down queries and addressing each component in its responses. According to the company, Gemini 4 Hydrogen generates a wider range of links by conducting simultaneous queries across relevant subtopics, and includes more visuals such as images, comparison tables, graphs, and maps in its answers.
One example from Stein shows the model generating an interactive animated driving simulation in response to a question about how phones determine which highway lane a car is in without cell service.
The model offers four thinking level options: low, medium, high, and a new “xhigh” mode. Google claims Gemini 4 Hydrogen delivers improvements in both speed and intelligence compared to Gemini Flash 3.8, and says it “matches or outperforms some of the competing models in its class,” specifically naming Claude Sonnet 5.5 and GPT-6.1 Terra. The company also reports improved language understanding across all supported AI Mode languages.