Google continues its elemental AI naming scheme with the new Gemini 4 Hydrogen. These names are less descriptive than the Pro/Flash monikers of previous versions, but Hydrogen’s purpose is clear: It replaces the faster, cheaper Flash models used by most people in the Google ecosystem.
With the recent releases of Argon and Carbon from Google, the launch was organized and started with cybersecurity researchers. Even when general availability began, Google restricted access to users who paid for its most expensive AI subscription. The limits for Hydrogen are much more relaxed and access begins immediately. This model has replaced Gemini 3.8 Flash in all of the company’s products.
Google says Hydrogen represents a significant improvement over the previous Flash model. It runs in one of four thinking levels (low, medium, high and the new xhigh), and even in high mode, it is 2.5 times faster than Flash 3.8. Additionally, it reduces “made-up claims” by more than five times, according to Google analysis. Users will also see improvements in code generation, with Hydrogen tripling its 3.8 Flash score in Terminal-Bench. In some cases, hydrogen even trades blows with argon. It achieved a score of 54 on the popular Artificial Analysis Intelligence Index with xhigh mode versus 50 for Argon.
