Google is internally testing Hydrogen, a speed-focused Gemini 4 Flash model, according to an internal message seen by Business Insider. Staff can try it in Jetski, the platform Google’s developers use internally, where models often appear before launch, and one employee said it works like earlier Flash models, which Google positions as quicker and cheaper alternatives to its top models. Hydrogen follows Tuesday’s rollout of Gemini 4 Carbon, which Google calls its most capable model yet, but Carbon and the earlier Gemini 4 Argon are only available to paying users. Google already offers some Flash models at no cost in the Gemini app, but it’s unclear whether Hydrogen would be free. The Gemini 4 lineup arrived after Google pushed back and eventually scrapped Gemini 3.5 Pro this year.
