Google releases Gemini 4 Hydrogen, now the default model in AI Mode and AI Overviews

Google released Gemini 4 Hydrogen, a new model it says gives more helpful answers to complex questions, including questions with multiple parts, hard-to-understand typos, or highly specific requests. It is available starting today in Search, the Gemini app, all tiers of Google AI Studio, the Gemini API, Gemini for business, and Google Antigravity for AI Pro and Ultra subscribers, and Google Search VP Robby Stein says it is now the default model in AI Mode and is used for the hardest questions in AI Overviews.