If you use Gemini or Google Search, the model answering your queries is about to change. Google’s new Gemini 4 Hydrogen starts rolling out to both today.
Gemini 4 Hydrogen is the newest member of the Gemini 4 family, joining the heavier Carbon and Argon models. It replaces Gemini 3.8 Flash, and Google says it finishes tasks 2.5 times faster while being noticeably smarter.
What changes in the Gemini app
In the Gemini app, Hydrogen appears in the model picker, but free users get it automatically when Gemini decides it suits the prompt. Google AI Pro and Ultra users can also use it in Google Sheets, where Google says it can turn financial data into interactive models and generate outputs over 30 percent faster than previous models.According to Google, Gemini 4 Hydrogen can understand instructions better and stick to your tone, format, and rules, and keeps following them through longer conversations. It also works better with Google apps such as Gmail, Google Drive, and Connected Apps like Dropbox, and picks the right tools more often.
Hydrogen also builds clear comparisons using tables and visual breakdowns without missing key details. If you’re into rapid prototyping, it also helps you build and refine interactive projects with fewer prompts.
What changes in Google Search
On Google Search, the Gemini 4 Hydrogen is designed to understand what you mean, even with multi-part questions, typos, or very specific requests. It is built to provide visual and easy-to-scan responses without slowing Search down.
It will also show a wider range of links in search results, so you may find sites you wouldn’t have found otherwise. This could help publishers who say that AI answers send them less traffic.
In terms of performance, Hydrogen edges the heavier Argon model on the Artificial Analysis Intelligence Index, scoring 51 compared to Argon’s 50, and 54 at its highest thinking setting. Google says it is safer than Gemini 3.8 Flash. It reduces agentic overreach by up to 81 percent. It also cuts misaligned shortcuts by 12x, is up to twice as unlikely to bypass permission restrictions, and has achieved a 96.7 percent honesty rate in internal agent evaluations.
For developers, Hydrogen is priced at $1.50 per million input tokens and $7.50 per million output tokens in AI Studio and the Gemini API. For everyone else, it’s free in Search and the Gemini app, and it should make your everyday chats and searches feel noticeably quicker and sharper.
