Google is letting staff test a 'fast' new Gemini AI model named Hydrogen

Google CEO Sundar Pichai. Finn Gomez/Getty Images Google has been testing what it calls a "fast" Gemini 4 Flash model internally, named Hydrogen. The company just launched Carbon, which it says is its most capable model yet. Google offers other Flash models for free in its Gemini app. Google's Gemini 4 era is fully in its element. Following the release of its Gemini 4 Argon and Carbon models, Google has been internally testing a new model that is designed for speed and efficiency. The new model is known internally as Hydrogen, according to an internal message seen by Business Insider. In a message to staff this week, a Google engineer described Hydrogen as "very capable, fast and efficient." Staff were given access to Hydrogen in Google's internal development platform, known as Jetski, which often pre-empts a public launch.