Google releases Gemini 4 Hydrogen for everyday coding and agent work

Google released Gemini 4 Hydrogen, the fast, efficient model in the Gemini 4 family, built for everyday coding and agentic workflows. Carbon and Argon stay Google's frontier models for long-horizon reasoning.

It's rolling out globally. Developers get it in the Gemini API, every tier of Google AI Studio and Android Studio, and businesses get it in Gemini for business. In the Gemini app it's in the model drop down, and free users reach it through auto model selection when it fits the prompt. It's also in Google Search for all users, and in Gemini in Google Sheets for eligible business plans and Google AI Pro and Ultra subscribers.

The price is flat across its 1 million-token context window, at $1.50 per million input tokens and $7.50 per million output tokens. There are four thinking levels, low, medium, high and a new xhigh, with high as the default.

Google says Hydrogen scores 51 on the Artificial Analysis Intelligence Index at its default setting, against Argon's 50, and 54 at xhigh. Compared with Gemini 3.8 Flash, Google says it finishes tasks 2.5 times faster, scores 57% on Terminal-Bench 4.1 against 18.2%, and makes fabricated claims less than a fifth as often. These are Google's own figures.

In Google Antigravity, a new Orchestrator switches between models such as Carbon and Hydrogen within one session. Google says it reached near-Carbon success rates on Terminal-Bench 4.0 while using 24% less quota and finishing 19% faster on average. Hydrogen in Antigravity needs a paid Google AI Pro or Ultra subscription.

In Search, Hydrogen handles questions with several parts, typos or very specific requests, fans out to more simultaneous queries to surface a wider range of links, and returns more visual responses such as images and comparison tables.