Where Hydrogen is rolling out

Google began rolling out Gemini 4 Hydrogen on November 12 across Search, the Gemini app and its developer tools. DeepMind says it adapted Hydrogen from Gemini 4 Carbon, a model built for longer and harder tasks. Hydrogen is meant for more routine work, such as editing code, running tests or pulling details from documents.

The rollout does not give everyone the same controls. In the Gemini app, Google says free users get Hydrogen when the app selects it for a prompt. Google lists it in the Gemini API and AI Studio. In Sheets, the rollout starts with eligible subscriptions rather than every account.

What the API price covers

The standard paid Gemini Developer API charges $1.50 per million input tokens and $7.50 per million output tokens. Tokens are the units the API counts when it processes and generates content. The output rate also applies to the tokens the model spends working through a problem, not just the text a person sees.

The API offers four levels of reasoning effort, with high as the default. On a simple task, a lower setting may be enough. On a longer job that involves several calls, the cost also depends on how many times the model has to try. A short answer by itself is not a reliable guide to what the job will cost.

What to test before switching

Google says Hydrogen finished tasks 2.5 times faster than Gemini 3.8 Flash at Hydrogen’s default high setting in its comparison. The model card also reports more unnecessary refusals in its automated safety tests than for 3.8 Flash, especially on prompts that include more than text. Neither result establishes how a particular application will behave.

For a team considering a switch, a useful comparison is to run a few representative jobs and count successful completions, review time and total cost. A quick edit that needs to be redone can cost more than a slower edit that passes its tests.

Sources

  1. Google: Gemini 4 Hydrogen launchNovember 12 rollout, product eligibility, reasoning levels and company-reported performance.
  2. Google DeepMind: Gemini 4 Hydrogen model cardRelationship to Carbon and automated safety results, including unnecessary refusals.
  3. Google AI Studio: Gemini Developer API pricingHydrogen Standard paid-tier rates and billing treatment for reasoning tokens.