Google has unveiled Gemini 4 Hydrogen, adding another model to its frontier lineup alongside Gemini 4 Carbon and Gemini 4 Argon within a matter of days.

Built for rapid execution across agentic workflows, Hydrogen brings Google’s latest model capabilities to everyday coding, software development and other tasks that require speed and efficiency.

Unlike Carbon and Argon, which are designed for deep, long-horizon reasoning on complex problems, Hydrogen focuses on fast execution. It can write code, run tests, verify changes, and handle routine development tasks, either independently or alongside the other Gemini 4 models.

Hydrogen also surpassed Argon on the Artificial Analysis Intelligence Index, scoring 51 against Argon’s 50 at the default high thinking level. Its score rises to 54 at the highest xhigh setting, according to Google.

Google designed Hydrogen to handle everyday developer workloads, including debugging, repository coding, web development and multi-step agentic tasks. It can also process text, images, audio, and video, with a combined input-output context window of up to 1 million tokens.

The model offers four thinking levels: low, medium, high, and a new xhigh setting, allowing developers to adjust reasoning depth according to a task’s complexity, latency, and cost requirements.

In Google’s evaluations, Hydrogen scored 57 percent on Terminal-Bench 4.1, more than three times the 18.2 percent recorded by Gemini 3.8 Flash. The company also says Hydrogen completes tasks 2.5 times faster than its predecessor at the default high setting.

For broader knowledge work, the model can analyze documents, spreadsheets, charts, and recorded video to produce reports and structured outputs.

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