Google says Gemini 4 Hydrogen is now available in Google Search globally for all users. The company called it the biggest model upgrade to Search yet.
Google says the model lets Search handle more complicated, multi-part questions, including ones with typos or highly specific requests, through deeper instruction following and tool calling. It names travel, shopping and hobbies as areas where users can ask about specific requirements in natural language.
According to Google, Hydrogen's reasoning extends Search's query fan-out technique, which runs simultaneous queries across relevant subtopics, so answers connect to a broader range of links than before, including sites users might not have found. Google says responses will show more images, structured responses, comparison tables and custom tools, with improvements across all supported AI Mode languages.