Google Launches Gemini 4 Hydrogen, a Smarter Replacement for Flash

Highlights

Google announced Gemini 4 Hydrogen on November 12, 2026, replacing the Flash brand.
Free Gemini app users get Hydrogen through automatic model selection.
It scores 51 on the Artificial Analysis Intelligence Index, just above Gemini 4 Argon (50).
API pricing is reported at $1.50 per million input tokens and $7.50 per million output tokens.
Hydrogen is now the default model for AI Mode in Google Search.

Google has released another model just two days after Gemini 4 Carbon. This time it is Gemini 4 Hydrogen, a lighter, cheaper model that Google says outperforms Gemini 4 Argon.

Hydrogen was announced on November 12, 2026. According to 9to5Google, Google chose the new name instead of keeping the Flash branding it had used for its fast, low-cost models.

What makes Hydrogen notable for everyday users is reach. The model goes straight into the Gemini app, including free accounts, and powers AI Mode in Google Search.

Quick answer: Gemini 4 Hydrogen is a Google AI model released on November 12, 2026 as the successor to the Flash line. It is available free in the Gemini app via automatic model selection, is the default model for AI Mode in Google Search, and is open to developers through Google AI Studio and the Gemini API. It scores 51 on the Artificial Analysis Intelligence Index, above Gemini 4 Argon's 50.

What Is Gemini 4 Hydrogen?

Gemini 4 Hydrogen is the newest member of the Gemini 4 family, after Argon and Carbon. Carbon is positioned as the strongest model for the hardest work; Hydrogen targets everyday use at a lower cost.

According to 9to5Google, Hydrogen supports up to 1 million input tokens. Google's main comparison point is Gemini 3.8 Flash, released in September 2026, and the company says Hydrogen finishes tasks 2.5 times faster at its default setting.

Hydrogen also offers several thinking levels. The default is high, with an xhigh level for heavier tasks.

How Smart Is Gemini 4 Hydrogen?

Google, as quoted by 9to5Google, shared a range of results. The standout is Terminal-Bench 4.1, which tests an agent's ability to work in a computer terminal: Hydrogen scored 57%, more than triple Gemini 3.8 Flash.

The table below summarizes the published scores.

Benchmark	Hydrogen score	Note
Artificial Analysis Intelligence Index	51 (high), 54 (xhigh)	Argon scores 50
Terminal-Bench 4.1	57%	Gemini 3.8 Flash: 18.2%
HLE-Diamond	58.8%	Leads its class
Vals Tax Agent Bench	52.3%	Ranked No. 1
Vals Legal Research Bench	55.8%	Tied for No. 1
Agents' Last Exam v1.1	71.6%	-

Google's claims as reported by 9to5Google, November 12, 2026. Not independently tested.

Google also highlights agent safety. Compared with 3.8 Flash, Hydrogen reportedly cuts overreach by up to 81% and is up to two times less likely to bypass permission boundaries.

Where Can You Try Gemini 4 Hydrogen?

In the Gemini app, free users get Hydrogen through automatic model selection when the system judges it the best fit. In the model picker it appears as Everyday help.

In Google Search, Hydrogen is the default model for AI Mode and handles the hardest questions in AI Overviews. Google says AI Mode answers are now more visual and link-rich.

Developers can use it through Google AI Studio and the Gemini API, while paid Google AI Pro and Ultra subscribers can use it in Google Antigravity, Google's agentic coding tool.

How Much Does Gemini 4 Hydrogen Cost?

According to 9to5Google, pricing is $1.50 per million input tokens and $7.50 per million output tokens. TechBuzz reported that pricing had not yet been disclosed, so developers should check Google's official pricing page before budgeting.

For comparison, Gemini 4 Carbon, released November 10, carries an introductory price of $2 per million input tokens and $10 per million output tokens through November 30, 2026, rising to $4 and $20 afterward.

In Antigravity, Google pairs the two. Carbon acts as the coordinator and hands routine steps to Hydrogen to use fewer tokens.

Who Benefits Most?

For free users, answer quality in everyday Gemini use may improve at no extra cost. That matters after Google AI Plus subscribers lost Gemini Pro access starting November 13.

For publishers and SEO teams, the AI Mode changes are worth watching. Google says answers now include more links, which could shift how content surfaces in search.

For developers and startups, a model that is cheaper than Argon with a similar score could be attractive for chatbots, customer service assistants and automated agents.

FAQ (Frequently Asked Questions)

1. When was Gemini 4 Hydrogen released?

Google announced Gemini 4 Hydrogen on November 12, 2026, two days after Gemini 4 Carbon became broadly available.

2. Is Gemini 4 Hydrogen free?

Yes, in the Gemini app. Free users get it via automatic model selection. In Google Antigravity it is limited to AI Pro and Ultra subscribers.

3. How is Hydrogen different from Carbon and Argon?

Carbon is the strongest model for the hardest tasks, Argon targets coding and analysis, and Hydrogen is for fast, low-cost everyday use.

4. What is Gemini 4 Hydrogen's API price?

According to 9to5Google, $1.50 per million input tokens and $7.50 per million output tokens. Check Google's official pricing page for final figures.

5. Does Hydrogen replace Gemini Flash?

Yes. Google used the Hydrogen name instead of continuing the Flash brand for this class of model.

Conclusion

Gemini 4 Hydrogen shows that low-cost models can now rival mid-tier models of the same generation. The easiest way to try it is through the Gemini app or AI Mode in Google Search.