Google ships Gemini 4 Hydrogen with a unified million-token window
Google released Gemini 4 Hydrogen globally across the Gemini API, AI Studio, Gemini for business, the Gemini app, Search, Sheets and paid Antigravity plans. The model combines a one-million-token unified input-and-output window with background generation and a continuation token for long tasks.
Why it matters: A lower-cost Gemini 4 model with long background generation creates a concrete option for coding, document and agent workloads that outgrow ordinary response windows. The unified limit also means long output directly consumes the same budget as input.