Relative cost 1.8× · $0.18 per short-answer task · $1.27 per agentic task
Gemini 4 Hydrogen (`gemini-4-hydrogen`) is Google's fast Gemini 4 model for everyday coding and agentic workflows, adapted from Gemini 4 Carbon and built for rapid execution on its own or as a sub-agent orchestrated alongside the frontier Carbon and Argon models. Google made it generally available on November 12, 2026 through the Gemini API, Google AI Studio, Google Antigravity, Gemini for business, Google Sheets, the Gemini app and Google Search, at $1.50 per million input and $7.50 per million output tokens across the full context window. It accepts text, image, audio, video, and PDF input and returns text, with a unified 1,048,576-token input-plus-output context window, 65,536 default synchronous output tokens or up to 1,048,576 with long decode, and low, medium, high (the default) and a new xhigh thinking level.
Google