📅 Nov 13, 2026
Google just shipped its fastest Gemini 4 model yet, built for coding and AI agents — and it's now the brain behind Search.
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Hydrogen is now the default model in AI Mode and powers the hardest questions in AI Overviews.
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Google calls it the daily driver for agentic work, with four thinking levels from low to xhigh.
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$1.50 per million input tokens and $7.50 per million output, across a one-million-token context window.
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Hydrogen scores 51 on the Artificial Analysis Intelligence Index — 54 at its highest setting — just ahead of Argon's 50.
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