Google Rolls Out Gemini 4 Hydrogen to Upgrade Search
Google's new Gemini 4 Hydrogen model powers faster, smarter Search answers to complex questions, rolling out globally.
Google (GOOGL) on Wednesday released Gemini 4 Hydrogen, a new model it calls its biggest improvement to Search yet, bringing faster answers to complex, multi-part questions. Shares were up 1.8% in delayed trading.
Hydrogen is built for fast execution across agentic workflows—tasks where an AI carries out multiple steps on its own—rather than the deepest reasoning. Google's frontier models, Gemini 4 Carbon and Gemini 4 Argon, handle hard problems; Hydrogen is the faster, cheaper option. Google says Hydrogen completes tasks 2.5 times faster than Gemini 3.8 Flash, its previous fast model, yet beats Argon on one broad intelligence benchmark, the Artificial Analysis Intelligence Index, at its default high thinking level.
In Search, Hydrogen better understands user intent, handles nuanced and complicated questions asked in a natural train of thought—including multiple parts or highly specific requests—and navigates hard-to-understand typos. It follows instructions better and calls the right tools, so it can address each part of a question more precisely. Its advanced reasoning improves Search's fan-out technique, which breaks a single prompt into multiple subqueries so users discover related sites they might have missed. Users will also see more images, structured responses, comparison tables and custom tools as visual responses in AI Mode, plus better answers across the languages AI Mode supports.
Hydrogen offers four thinking levels—low, medium, high (default) and a new extra-high "xhigh" tier—designed to finish tasks faster with fewer output tokens. On multi-step tasks like deep research, data analysis and broad codebase navigation, it ranks No. 5 on Agent Arena's benchmarks. It can work alone for everyday tasks such as writing code, running tests or verifying code changes, or pair with Carbon and Argon in multi-model workflows.
Beyond Search, Hydrogen is coming to all tiers of Google's AI Studio, the Gemini API, the Gemini App, and paid AI Pro and Ultra subscribers in Google's Antigravity development platform. Google says the update is rolling out to all Search users globally, according to TechCrunch.