Google released Gemini 4 Hydrogen, a new AI model designed to improve Search's ability to understand complicated questions with multiple parts, highly specific requests, and typos. The model completes tasks 2.5 times faster than Gemini 3.8 Flash, Google's previous fast model, while still outperforming the more powerful Gemini 4 Argon on the Artificial Analysis Intelligence Index at its default high thinking level.
Hydrogen improves Search by better understanding user intent, offering more helpful links and visual responses, and delivering better answers across Google's supported languages. The model handles nuanced questions more quickly by breaking down complex prompts into multiple subqueries. This technique, called fan-out, helps users discover websites they may have otherwise missed.
Google designed Hydrogen for "fast execution across a variety of agentic workflows," or tasks where AI carries out multiple steps on its own. The company notes that using the most powerful model isn't always necessary. Hydrogen ranks No. 5 on Agent Arena's benchmarks for multi-step tasks like deep research, data analysis, and codebase navigation.
The model offers four thinking levels: low, medium, high (default), and a new extra-high tier. Hydrogen also appears in Google AI Studio, the Gemini API, the Gemini App, and paid AI Pro and Ultra subscribers in Google's Antigravity development platform. Google says the Hydrogen update is rolling out to all Search users globally.