Google Launches Gemini 4 Hydrogen, a Budget Model That Outperforms Its Pricier Sibling

Google LLC unveiled Gemini 4 Hydrogen today, positioning the new model as a more affordable option within its Gemini 4 lineup that nonetheless achieves superior performance compared to the company's flagship Gemini 4 Argon on third-party evaluation metrics.

On the Artificial Analysis Intelligence Index at its standard high thinking level, Hydrogen reached a score of 51 versus Argon's 50, Google stated. The new model introduces an additional thinking tier designated xhigh, which pushes Hydrogen's score to 54.

The launch approach diverged significantly from Argon's rollout strategy. Argon spent roughly two weeks in testing with members of Google's Fairwind Program, a curated group of cybersecurity specialists, before becoming accessible to paying developers on October 13. Hydrogen bypassed this phase entirely, becoming available to all users immediately, including those using the free tier of the Gemini app.

Koray Kavukcuoglu, who assumed leadership of Google DeepMind in August following Demis Hassabis's transition to chairman, described Hydrogen as "built for rapid execution" in the announcement.

Integration with Development Tools

Google introduced Orchestrator to its Antigravity coding platform today, a feature that dynamically selects between Hydrogen and Gemini 4 Carbon during active development sessions. Testing on Terminal-Bench 4.0 demonstrated that Orchestrator achieved performance levels comparable to Carbon while consuming approximately 24% less quota on average.

Performance Benchmarks

Gemini 3.8 Flash, released in September, serves as the baseline for most performance comparisons in Google's announcement. Hydrogen completes tasks 2.5 times faster than this earlier model at default settings. On Terminal-Bench 4.1, which evaluates command-line operations, Hydrogen achieved a 57% score, more than tripling the 18.2% result from Gemini 3.8 Flash.

Early Adopter Feedback

Among developers testing the model early, Andrew Carr, a former OpenAI researcher now serving as chief scientist at 3D animation company Cartwheel Inc., reported that Hydrogen identified two issues his team had been investigating for a decade. Discovery Loop Inc., the startup co-founded by former Google Chief Scientist Jeff Dean after his departure in August, also participated in early testing.

Rapid Release Cadence

Kavukcuoglu stated in late September that Google aimed to ship Gemini 4 substantially sooner than year-end. The company has now delivered three Gemini 4 variants within a span exceeding six weeks. Hydrogen arrived just two days after Carbon, which similarly began with Fairwind Program access before expanding to paying developers and Google AI Ultra subscribers.

Availability and Pricing

Hydrogen is now accessible through the Gemini API, Google AI Studio, and Google Search. Subscribers to paid Google AI Pro and Ultra tiers can also access it within Antigravity. Pricing is set at $1.50 per million input tokens and $7.50 per million output tokens across the complete 1 million-token context window. Argon carries introductory pricing of $2 and $10 per million tokens respectively, scheduled to increase to $4 and $20 after November 30.