Google introduced Gemini 4 Hydrogen, a fast model for everyday coding and agentic work that sits below its frontier models, Gemini 4 Carbon and Gemini 4 Argon. It is priced at $1.50 per million input tokens and $7.50 per million output tokens, flat across a 1 million-token context window, and offers four thinking levels. Google says it scores 51 on the Artificial Analysis Intelligence Index at its default setting, ahead of Argon's 50, and 54 at its highest setting.
Hydrogen is rolling out globally in the Gemini API, AI Studio, Gemini for business, the Gemini app and Google Search for all users. In Search, Google says the model better handles multi-part queries and typos, gives more visual answers and powers an upgraded query fan-out that links to a broader range of sites than before.
Against Gemini 3.8 Flash, Google says Hydrogen finishes tasks 2.5 times faster, scores 57% on Terminal-Bench 4.1 versus 18.2%, and cuts fabricated claims by more than 5x. Partners in early testing saw it run 2x to 2.8x faster with 12% to 23% fewer tokens, according to Google. Google also reports Hydrogen is more than 2.3x more resilient on the Gray Swan prompt injection benchmark, and it launched Orchestrator, a tool in Antigravity that switches between Carbon and Hydrogen in one session.