Google Search upgrades globally to Gemini 4 Hydrogen
Google Search has moved all users worldwide to Gemini 4 Hydrogen, which the company calls its biggest model upgrade to Search yet. The model improves intent understanding for multi-part and typo-heavy questions, adds deeper instruction following and tool calling, and strengthens query fan-out to surface links users might not otherwise find. Responses also become more visual, with more images, comparison tables and custom tools, across all supported AI Mode languages.
Why it matters: Google Search's largest model upgrade to date, with Gemini 4 Hydrogen now handling multi-part questions, tool calling and query fan-out for all users globally.