It has been reported that Google will apply its newly released Gemini 4 Hydrogen model to AI Mode in Google Search and begin rolling out updates to users worldwide. The model is designed for multi-step agent tasks, enabling faster comprehension of complex queries involving multiple requirements, specific conditions, and spelling errors. It enhances search intent recognition, link recommendations, and multilingual responses, while optimizing "fan-out" retrieval splitting to uncover more relevant websites. Google states that Hydrogen achieves task execution speeds 2.5 times faster than the previous-generation Gemini 3.8 Flash and surpasses Gemini 4 Argon under the default high-thought level in the Artificial Analysis Intelligence Index.

The model's thinking levels include low, medium, high, and an added ultra-high tier. AI Mode will also offer enhanced features such as more images, structured answers, comparison tables, and custom tools. Hydrogen is simultaneously made available to Google AI Studio, Gemini API, Gemini App, and the Antigravity development platform’s AI Pro and Ultra paid users.