Gemini 4 Hydrogen appears in Google Cloud's price list at $1.50 input and $7.50 output per 1M tokens, before Google has announced it

Google Cloud's public SKU list now carries Gemini 4 Hydrogen under two services, the Gemini API and Vertex AI, before Google has announced the model. @Mr_Salio flagged the rows at 08:11 UTC on November 12, and ArtificialWatch read them on Google's SKU list at 08:50 UTC.

THE PRICES

Per 1M tokens, global, as Google's SKU list prices them:

• Standard: $1.50 input, $7.50 output, $0.075 cached input. Text, image, audio and video input all cost the same.
• Batch and Flex: $0.75 input, $3.75 output, $0.0375 cached input.
• Priority: $2.70 input, $13.50 output, $0.135 cached input.
• A further set of half-price rows is labelled 'contributor', at $0.75 input and $3.75 output. Google has not said what that tier is.
• On Vertex AI, regional rows cost 10% more than global, for example $0.825 against $0.75 for Flex text input.

HOW IT COMPARES

• Gemini 4 Carbon's SKU rows list $4 input and $20 output, so Hydrogen's rows come to 37.5% of Carbon's.
• Gemini 4 Argon and Carbon both launched at half their SKU list price for an introductory period, $2 / $10 through November 30. @LuminaBench expects Hydrogen to launch the same way, at $0.75 / $3.75. Google has not said.

WHAT IS NOT CONFIRMED

• A release. At 08:51 UTC Google's Gemini API models, pricing and changelog pages, Vertex AI's release notes and OpenRouter list no Hydrogen id.
• Whether Hydrogen is sold as Gemini 4 Flash. Accounts on X have called Hydrogen the Flash codename since October 27, and Business Insider reported on November 11 that a Google employee likened it to Google's earlier Flash models.
• Earlier on November 12, @aitrackerbot posted a screenshot it says shows gemini-4-hydrogen answering on Vertex AI's global endpoint. ArtificialWatch could not check that.

WHAT WE DO NOT KNOW

When Hydrogen opens to developers, its context window, and whether it launches at the list price or an introductory one. Carbon's SKU rows were flagged at 08:10 UTC on November 10, and it went generally available on the Gemini API at 15:46 UTC the same day. ArtificialWatch's Hydrogen hunt is armed and alerts subscribers when the id appears on a list we sweep.