What is Gemini 4 Hydrogen?

Gemini 4 Hydrogen (gemini-4-hydrogen) is Google's Gemini 4 model for everyday coding and agentic work, announced on November 12, 2026. It is on the free and paid Gemini API and AI Studio tiers, in the Gemini app and Search, and in Antigravity for Google AI Pro and Ultra subscribers. Official paid API pricing is $1.50 per million input tokens and $7.50 per million output tokens, flat across a 1 million-token context. AppFor.ai has not called the API.

What you can use Gemini 4 Hydrogen for

Google presents Hydrogen as a generally available Gemini 4 model for everyday coding and agentic workflows: writing and editing code, running tests, verifying changes, iterating on user interfaces, and handling multi-step tasks such as research, data analysis and navigating a codebase. It also describes consumer uses in the Gemini app, including writing, research, connecting to Google apps such as Gmail and Drive, and everyday prototyping, plus more helpful responses in Google Search.

The November 12, 2026 announcement contrasts Hydrogen with Gemini 4 Carbon and Gemini 4 Argon, which Google says are for deep, long-horizon reasoning on harder problems. Hydrogen can be used on its own or as the faster execution model next to those frontier models. In Google Antigravity, Orchestrator can switch between Carbon and Hydrogen in one session. Google also reports that Hydrogen scores 51 on the Artificial Analysis Intelligence Index at the default high thinking level, versus 50 for Argon, and 54 at xhigh; those figures are Google's claims, not an AppFor.ai test.

A first workflow to try

Suggested workflow, not a recorded run: open the Gemini 4 Hydrogen model page in Google AI Studio, or start a new prompt with the model ID gemini-4-hydrogen. Send a concrete coding or analysis task, such as building a small interactive page or checking a function, and leave thinking at the default high level unless you have a reason to choose low, medium or xhigh. If you already work in Antigravity and subscribe to Google AI Pro or Ultra, you can also select Hydrogen there, or use Orchestrator when you want the product to switch models in a session. AppFor.ai has not signed in to run this workflow.

Pricing and access

Hydrogen began a global rollout on November 12, 2026, across Google AI Studio and the Gemini API (free and paid tiers), Gemini for business, the Gemini app, Google Search, Gemini in Google Sheets starting with Google AI Pro and Ultra and eligible business subscriptions, and Google Antigravity for paid Pro and Ultra subscribers. In the Gemini app, a blog footnote says free users get Hydrogen through auto model selection when it is the appropriate model for the prompt.

Official API prices are listed above. Output pricing includes thinking tokens. Implicit caching is the only cache option. Grounding with Search or Maps is a paid-tier extra after a shared monthly free allowance, and a single request can trigger more than one billed search. The model does not generate images or audio and does not support the Live API. Check the official pricing and rate-limits pages for current quotas. AppFor.ai has not billed a Hydrogen request.

What stands out

Stable model ID gemini-4-hydrogen, on free and paid Google AI Studio and Gemini API tiers
Unified 1,048,576-token context, default synchronous max output 65,536, long decode up to 1,048,576 tokens
Thinking levels: low, medium, high (default) and xhigh
Inputs: text, image, video, audio and PDF; output: text
Code execution, computer use, function calling, file search, implicit caching, Search and Maps grounding, structured outputs and URL context

Before you choose

Google's speed, quality and benchmark claims have not been independently tested by AppFor.ai.
Image generation, the Live API and audio generation are not supported. Explicit caching is not supported.
Every token is billed, including thinking tokens and tool system instructions when grounding is used.
Google Antigravity access is described for paid Google AI Pro and Ultra subscribers. Free Gemini app users get Hydrogen through auto model selection when Google considers it appropriate.
AppFor.ai has not called the Gemini 4 Hydrogen API.

Plans & pricing

Current pricing on aistudio.google.com

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Sources & further reading

Based on the official documentation below. Features and access can change; check the provider before making a decision.

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Gemini 4 Hydrogen