Google opens Gemini 4 Hydrogen in the API, app, and Search

On Nov. 12, 2026 Google said Gemini 4 Hydrogen is rolling out in the Gemini API, AI Studio, Gemini for business, the Gemini app, and Google Search, and that paid Google AI Pro and Ultra subscribers can use it in Antigravity. The company prices it at $1.50 per million input tokens and $7.50 per million output tokens. The model page lists id gemini-4-hydrogen, a unified 1,048,576-token context window, default output of 65,536 tokens, and long decode up to 1,048,576. Free Gemini app users get it through automatic model selection, and Google says the default high setting scores 51 on the Artificial Analysis Intelligence Index, against 50 for Gemini 4 Argon.