Gemini 4 Hydrogen is not announced, but it appears in Google Cloud's SKU catalog, on Vertex AI and in OpenRouter's catalog

Google has not announced Gemini 4 Hydrogen. Two accounts report separate evidence that the model exists, and OpenRouter's model catalog now lists it too:

• AiBattle_ said on November 12 that Gemini 4 Hydrogen is now in Google Cloud's SKU catalog, listed at $1.50 for input and $7.50 for output, and that it is likely to release later that day. It added that Google might launch at an introductory price, as it did with Gemini 4 Carbon ($0.75 and $3.75). It shared a screenshot, and the post says LuminaBench and @HarshithLucky3 also reported the catalog listing.
• aitrackerbot said it called gemini-4-hydrogen on Vertex AI's global endpoint and got a successful response: the model called itself "Gemini 4 Hydrogen, a large language model built by Google", and the response's model version field read gemini-4-hydrogen.

• OpenRouter's catalog added an entry, google/gemini-4-hydrogen ("Google: Gemini 4 Hydrogen"), on November 12, with a context length of 1,048,576 tokens and no expiration date. The entry gives no price.

The two accounts' posts followed a one-word "Gemini" post from Google AI Studio lead Logan Kilpatrick on November 11 (Pacific time), which accounts quoting it linked to this model; the post names no model. The account claims are theirs alone, and the catalog entry is OpenRouter's listing, not a Google statement: no Google post or documentation has confirmed the model, its price or its release.