Gemini 4 Hydrogen is now available for free in Google Search and the Gemini app, although free users in the latter access it through automatic selection: Google decides when to use it. The model is designed to follow complex instructions and work with documents, connected apps, and interactive projects.
The practical difference matters: not seeing Hydrogen in the app’s selector does not prove you aren’t using it. In Search, Google says the update is available globally; in Gemini, features and access may vary depending on the account and subscription. Koray Kavukcuoglu, SVP of Google DeepMind and Chief AI Architect at Google, put it this way: “Hydrogen brings cutting-edge intelligence to everyone”.
Five specific ways to try it
Extract action items from a long document. In Gemini, upload a PDF, spreadsheet, or material with charts and ask for an organized summary tailored to a specific task. For example: “Read this document and summarize the ten most important things I need to know. Flag deadlines, fees, restrictions, or potential issues, and include the page number for each finding. Finish with a table of outstanding actions.”
Google says Hydrogen can synthesize PDFs, spreadsheets, charts, audio, and recorded video into structured reports. To check the result, ask for page references and review any dates or conditions that could have consequences in the document. You can then ask follow-up questions about the same file without having to explain all the context again.
Draft an email with clear requirements. Describe the recipient, goal, tone, length, and anything you want to avoid. A useful prompt would be: “Help me decline a request kindly but firmly. Keep the email under 150 words, use a warm, conversational tone, avoid corporate jargon and unnecessary apologies, explain the decision, and end on a positive note.”
Google presents following tone, format, and style instructions as an improvement in Hydrogen. Don’t assume the first draft already reflects your voice: check the tone and details before sending it, and clarify what to change if the response is too formal or long.
Gather information from Gmail and Drive. If the relevant apps are connected and you have authorized access, ask Gemini to cross-reference messages and files to complete a specific task. For example: “Find information in my Gmail and Google Drive about my appointments and events over the next two weeks. Sort them by date, with time, location, and preparations; indicate what information is missing and which email or document contains each detail.”
Google also mentions connected apps such as Airtable and Dropbox. Connect only the services you need: the availability of integrations and actions may depend on the account and subscription, and Gemini needs permission to access that data. Confirm important information in the original email or file, especially if details are incomplete.
Turn an idea into an interactive prototype. Ask for a small, specific tool, specifying its fields and the expected result. For example, a household budget calculator with monthly income, housing, food, utilities, transportation, and savings that calculates what is left and displays a chart. You can then request design changes or new features.
Tom’s Guide recommends trying this kind of work in Canvas to keep the project organized. Google, meanwhile, describes Hydrogen as capable of generating interactive web prototypes with fewer prompts. Test every generated feature and request fixes with specific instructions; the fact that the model produces an interface does not guarantee that all calculations or behaviors are correct.
Search with multiple requirements. In Google Search, describe the full need in natural language instead of reducing it to a list of keywords. For example: “I’m looking for a lightweight laptop for working in cafés, with good battery life, capable of handling lots of tabs, for under $800. Compare options, explain their pros and cons, and show reliable reviews.”
Google says Hydrogen can understand multi-part questions, display visual answers, and connect to more relevant links. Search may also present tailored tables or tools. Open the links and compare the original information before making a decision: an organized answer is no substitute for checking prices, features, or terms on the linked pages.
How to tell if you have access
In the Gemini app, sign in with your Google account. Free users may get Hydrogen when automatic selection deems it suitable for the query; simple questions may still use a lighter model. Automatic selection may hide the model’s name, so don’t take its absence from the selector as proof that it wasn’t used.
In Search, Google announced Hydrogen for all users globally. The availability of specific features may vary by product: direct selection options are available to paid subscribers, and some advanced capabilities depend on plans or developer tools. Free doesn’t mean identical access across all accounts and surfaces.
Mistakes to avoid
Don’t grant permissions without checking which apps you’re connecting. If a task only requires one document, work with that file instead of enabling additional services. For information gathered from Gmail or Drive, verify dates, locations, and actions in the original messages.
Don’t treat an answer as infallible. Google DeepMind acknowledges that Hydrogen can hallucinate and notes that its knowledge cutoff is March 2026; information in some areas may be less up to date. For recent facts, check Search links or the sources cited in the answer. For documents, ask for references and compare them with the original.
Finally, don’t confuse free access in Gemini with free use of the API: Google sets Hydrogen’s price at $1.50 per million input tokens and $7.50 per million output tokens. The rate applies to the model via the API, not the free consumer access described for Gemini. If the selector doesn’t show Hydrogen, try a query that requires several steps and let Gemini choose the model.
Sources: Tom's Guide, Google, Google DeepMind, Google, Android Central
