How to use Gemini 4 Hydrogen for free
Short answer: yes, Gemini 4 Hydrogen is free to use, with rate limits. It is the only Gemini 4 model on the Gemini API free tier (Carbon and Argon are paid only). The fastest way in is Google AI Studio: sign in with a Google account, pick gemini-4-hydrogen, and chat or create a free API key. Billing is only required for the paid tier. Everything below was checked on Google’s own pages on 14 November 2026.
Try Hydrogen free in AI Studio ↗See same-prompt results →
Unofficial guide. Not affiliated with Google. We link to Google’s pages so you can check each line.
Every official free route, side by side
Google AI Studio
Chat with Hydrogen in the browser. Google’s pricing page lists Free Tier input, output and caching as “Free of charge”.
Free tier: no Google Search/Maps grounding, no Batch or Flex. Free-tier prompts are used to improve Google’s products.
Gemini API (free API key)
New accounts start on the Free tier; an active project is the only listed requirement (“some projects need verification”). Paid tier: $1.50 / $7.50 per 1M tokens.
Gemini app
Google: free users “will get access to Gemini 4 Hydrogen via auto model selection when it’s the appropriate model for the prompt.” You do not choose it yourself.
Google Search (AI Mode)
Google says Hydrogen powers the Search upgrade for all users globally, in supported AI Mode languages.
Google Antigravity
The launch post named paid Google AI Pro and Ultra subscribers. Antigravity’s model docs (checked 14 Nov) list Hydrogen on the “Free & Plus” plan too. The $0 Individual plan has “basic weekly rate limits”.
Student plan (Google AI Pro)
Not needed for Hydrogen. It is a free 12-month Google AI Pro plan with higher Gemini limits; terms below.
Source: Google AI Studio / Gemini API docs, checked 14 November 2026 · Source: Google AI Studio / Gemini API docs, checked 14 November 2026 · Source: Google AI Studio / Gemini API docs, checked 14 November 2026 · Source: Google Blog, checked 14 November 2026 · Source: Google Blog, 12 November 2026 · Source: Google Antigravity Docs, checked 14 November 2026 · Source: Google Antigravity, checked 14 November 2026
Free tier limits: what Google publishes
- Price: Free Tier input, output (including thinking tokens) and context caching are “Free of charge” for Standard and Priority inference. Batch and Flex are “Not available” on the Free tier.
- Exact request limits are per project. Google’s rate-limits page (checked 14 Nov) says limits depend on your tier and are shown in AI Studio’s rate limit page; it does not print a fixed free-tier number for Hydrogen. We will not guess one. Exceeding RPM, TPM or RPD returns a 429 (see Errors & limits).
- Data: on the Free tier, “Used to improve our products” is “Yes”; on the paid tier it is “No”. Do not paste private or client data into free-tier prompts.
- Grounding with Google Search / Maps: “Not available” on the Free tier.
- Moving to paid: link a billing account and prepay at least $5 of credits; Free → Tier 1 “typically” takes effect instantly.
Source: Google AI Studio / Gemini API docs, checked 14 November 2026 · Source: Google AI Studio / Gemini API docs, checked 14 November 2026 · Source: Google AI Studio / Gemini API docs, checked 14 November 2026
Two claims going around, checked
| Claim seen on X | What official pages say |
|---|---|
| “Hydrogen in Antigravity is Pro/Ultra only.” | The 12 Nov launch post (page last updated 13 Nov) says “paid Google AI Pro and Ultra subscribers in Google Antigravity”. Antigravity’s own models page, checked 14 Nov, marks Hydrogen available on Free & Plus, Pro (trial and paid), Ultra and Enterprise. Orchestrator (Carbon) is Ultra only; Orchestrator (Argon) is Pro and Ultra. |
| “Hydrogen is short-term and will be retired with 45 days’ notice.” | Google Cloud’s developer guide says Hydrogen “is a short-term generally available (GA) release subject to a minimum 45-day retirement notice policy.” That is a notice policy, not a retirement date. No retirement date had been published as of 14 Nov 2026. |
Source: Google Blog, checked 14 November 2026 · Source: Google Antigravity Docs, checked 14 November 2026 · Source: Google Cloud documentation, checked 14 November 2026
Is Gemini free for students? The exact terms
This is a Google AI Pro offer, not a Hydrogen offer. You can use Hydrogen without it.
- What you get: Google AI Pro at no charge for 12 months from the day you redeem. Google’s student page lists “4x higher usage limits in Gemini” and 5 TB of storage among the benefits.
- Who qualifies (offer terms, last updated 19 Aug 2026): 18 or older; enrolled at a higher-education institution in a supported country or region (Hong Kong, Macau and Tunisia excluded); student status verified through SheerID; a personal Google Account; a Google Payments account with a qualifying payment method at sign-up.
- Who does not: family-group members, enterprise purchasers, discounted Pixel bundle subscribers, people with a Google One subscription through a third party such as Google Fi, and supervised accounts.
- Deadline: redeem by 31 December 2026.
- After 12 months: your payment method is charged the standard monthly price unless you cancel before the offer period ends. The US student page shows $19.99/month and describes the offer for “eligible U.S. college students ages 18+”; the plan offered depends on your institution’s country.
- Eligibility must be verified each year to keep access, according to the student page FAQ.
Source: Google (gemini.google), checked 14 November 2026 from the US · Source: Google One, checked 14 November 2026
What people built with the free tier
Real posts, linked to the original. We only list posts where the author says they used Hydrogen for free, or built it in AI Studio. Times and results are the authors’ own claims.
@tomoya_ai_lab · X
Gemini 4 Hydrogen、無料で試してみた。頼んだのは「惑星が回る、宇宙のオルゴール」。
States free use. A cosmic music box with orbiting planets, coded by Hydrogen and screen-recorded; the author says they are not an engineer.
@itsjdraven · X
you can use this model on google AI studio … the free usage limit is also good for experimenting and building projects.
Says the AI Studio free usage limit is enough for experimenting and building games and web apps; the post includes a demo.
Built in AI Studio (tier not stated)
@aiislove666 · X
Gemini 4 Hydrogen one shot pelican game powered by three js. I made this in Google AI studio, without any harness.
Made in Google AI Studio; the post does not say which tier. Hydrogen is on AI Studio’s free tier.
@debugsenpai · X
Just tested Gemini 4 Hydrogen Extra High in AI Studio. Asked for a pelican riding a bicycle SVG.
Run in AI Studio; tier not stated.
Prompt by Simon Willison (@simonw) · simonwillison.net
Generate an SVG of a pelican riding a bicycle
Simon Willison's public LLM benchmark prompt. Many Hydrogen pelican posts (e.g. @StatsWire, @hiwise_aigc) build on it.
Prompt by V哥来了 (@vincent_ddup) · X
创建一款 2D 平台跳跃游戏，包含奔跑、跳跃、二段跳、移动平台、金币和危险障碍。加入检查点系统、金币计数器，以及抵达后即可结束关卡的终点旗帜。使用方向键或 WASD 实现灵敏顺畅的操作，并加入简单的关卡难度选择功能，或在角色死亡后提供重新开始选项。
The author ran this 2D platformer prompt (which they say is the Grok Build example prompt) in the Gemini app with Hydrogen: 6 minutes and 3 revisions by their count.
Prompts authors shared, ready to try free → All community cases →
FAQ
Is Gemini 4 Hydrogen free?
Yes, with limits. Google’s pricing page lists Hydrogen’s Free Tier input and output as “Free of charge” in Google AI Studio and the Gemini API (rate-limited), and free Gemini app users get Hydrogen through auto model selection when it suits the prompt. Paid API use is $1.50 / $7.50 per 1M input/output tokens.
How do I use Gemini 4 Hydrogen?
Open Google AI Studio, sign in with a Google account and choose gemini-4-hydrogen (Google’s own “Try it in Google AI Studio” link opens it directly). For code, create an API key on the Free tier. In the Gemini app it is picked automatically for free users; in Google Antigravity it is listed on the Free plan as of 14 Nov 2026.
Is Gemini free for students?
Google runs a separate student offer: a free 12-month Google AI Pro plan for eligible students 18+, verified through SheerID, redeemable until 31 Dec 2026, with a payment method required and automatic billing after the year unless cancelled. Hydrogen itself does not need the student plan; it is already on the free tiers above.
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