Google rolls out Gemini 4 Hydrogen to replace Gemini 3.8 Flash

In short: Google has started using its new Gemini 4 Hydrogen AI model across its products, replacing Gemini 3.8 Flash.

What happened

Google announced Gemini 4 Hydrogen, a new version of its Gemini AI model. It is meant to take over from the older Gemini 3.8 Flash model, which many people used because it was quick and cheaper to run.

Unlike earlier Gemini 4 models called Argon and Carbon, Hydrogen is not being rolled out slowly to a limited group. Google says access starts right away, and Hydrogen is now the default in many Google products.

Google also says Hydrogen can run at different “thinking levels,” including a new option called xhigh. You can think of this like choosing how much time the AI spends double-checking its work (fast answer versus more careful answer). Google claims Hydrogen is faster than 3.8 Flash even at higher settings, and it makes fewer “fabricated claims,” meaning fewer made-up statements.

Hydrogen is also being added to Google Search. Google says it should handle longer, multi-part questions better, and show more visual elements in results. The company also says it has tuned its system to include more links to sources.

Access is broad in Search, but more limited in other places. In the Gemini app and AI Studio, Hydrogen is available to AI Pro and Ultra subscribers. Free users and AI Plus users reportedly still use an older model.

Why it matters

For regular people, this mostly shows up as faster AI answers inside Google tools, and potentially fewer incorrect statements. If Hydrogen really links to more sources in Search, it could also make it easier to check where an answer came from, instead of taking it on faith.

Source: Arstechnica