Gemini 4 Hydrogen Access Depends on Google Product and Plan

Google’s Gemini 4 Hydrogen has different access and billing rules across its app, AI Studio and Gemini API, so a free account does not guarantee users can select the model directly.

Hydrogen is a model within Google’s Gemini products, not a separate chat app. App entitlements determine whether a person can select it, while API pricing applies to developer calls through the Gemini API.

Personal accounts without a Google AI subscription can use Auto or Flash-Lite in the Gemini app. Auto may route prompts that need more reasoning to Hydrogen, but free users cannot choose Hydrogen on demand. Google AI Plus, Google AI Pro and Google AI Ultra subscribers can select it directly. Hydrogen Tasks are available to Pro and Ultra subscribers, while actual access also depends on usage limits.

Workspace users have separate licensing terms, so personal account plan details do not establish what a work or school account can use. Google AI Studio and the Gemini API each have free and paid tiers, with gemini-4-hydrogen as the API model ID. The free tier has limits and does not necessarily include the same allowances or tools as the paid tier.

The standard Hydrogen API rates as of Nov. 14 are $1.50 per million input tokens and $7.50 per million output tokens, including thinking tokens. Implicitly cached input costs $0.075 per million tokens. Search and other tools or processing modes may have separate billing terms.

At those standard rates, a request with 10,000 uncached input tokens and 2,000 billable output tokens costs $0.03 before tool charges: $0.015 for input and $0.015 for output. The example assumes no cached input and excludes separate tool billing. Thinking tokens count toward output use, so the visible response may not show the full billable amount.

Paid API access is billed by use rather than through a monthly subscription. The Gemini app, AI Studio and API each have distinct access rules, so eligibility in one product does not establish a user’s access or allowance in another.