Google has rolled out Gemini 4 Hydrogen to Google Search globally for all users, calling it the 'biggest model upgrade to Search yet.'
The model now handles more nuanced queries, including multi-part questions, typos and highly specific requests. It follows instructions more precisely and delivers relevant responses to each part of a question. Query fan-out — the technique of conducting simultaneous searches across relevant subtopics — has been improved, surfacing links users might previously have missed.
Responses are now more visual, with more images, structured blocks, comparison tables and custom tools. Language support has expanded across all supported AI Mode languages, with more nuanced responses regardless of the language used.
The upgrade may affect how sites appear in Google Search, particularly in AI Mode and AI Overview results.
