Google released Gemini 4 Hydrogen on November 12 and says it’s coming to everyone in the Gemini app and Search. On your phone, though, what you get depends on your plan. Paid subscribers can choose Hydrogen from the model menu. Free users can’t select it at all.
On a free account, Hydrogen only answers when Auto model selection decides a prompt needs it. Google’s help page says Auto sends most prompts to Flash-Lite instead.
Who Gets Gemini 4 Hydrogen in the Gemini App
Google’s Gemini Apps Help page lists the models available on each plan:
- No Google AI plan: Auto, or Flash-Lite
- Google AI Plus: Flash-Lite, Hydrogen and Pro
- Google AI Pro: Flash-Lite, Hydrogen, Pro and Argon (Tasks can use Hydrogen or Argon)
- Google AI Ultra: Flash-Lite, Hydrogen, Argon and Carbon (Tasks can use Hydrogen, Argon or Carbon)
Paid users pay for that choice in usage limits. Once a paid user hits the limit, the chat continues on Flash-Lite.
Google calls Hydrogen its fast everyday model, and it replaces the old Flash branding. It sits below Gemini 4 Carbon and Argon, Google’s frontier models. Argon reached the app only for Pro and Ultra subscribers, and Carbon wasn’t in the app when Google announced it.
Free Users Should Leave Auto On
Here’s the catch for the free tier. With Auto model selection on, Gemini picks a model for each prompt. Google says most prompts use Flash-Lite for quick answers. Prompts that need more reasoning may go to Hydrogen. With Auto off, every response uses Flash-Lite.
So if you’re on the free tier and want any chance of getting Hydrogen, keep Auto turned on in the model picker. You can’t choose Hydrogen directly, so no prompt is guaranteed to reach it.
Google’s promise of access for everyone is true only in a narrow sense. Free users get Hydrogen only when Google’s router sends a prompt there, and most Auto prompts go to Flash-Lite. Paid users can pick it, but every Hydrogen chat counts against their limits.
The rollout is global and started on November 12. It may take time to reach every account.
What Google Says Hydrogen Changes
Google says Hydrogen follows instructions about tone, format and rules more closely. It also says the model calls the right tools more often. It can pull context from uploads, Gmail, Drive and Connected Apps such as Airtable and Dropbox. Those are Google’s claims, and we haven’t tested them.
According to 9to5Google, the Gemini app’s picker now maps tasks to models like this:
- Quick answers: 3.5 Flash-Lite
- Everyday help: 4 Hydrogen
- Detailed research: 3.1 Pro (on AI Pro)
- Code and analysis: 4 Argon
- Most complex work: 4 Carbon
Search, Sheets and Developers
Google says Hydrogen is coming to Search for all users worldwide, with more visual responses and a wider range of links. 9to5Google reports it is the default model for AI Mode. The outlet adds that it handles the hardest questions in AI Overviews.
In Google Sheets, Gemini gets Hydrogen first for AI Pro and Ultra subscribers. Developers pay $1.50 per million input tokens and $7.50 per million output tokens, flat across a 1 million-token context window.
Sources: Google, Google Search, Gemini Apps Help, 9to5Google
