A Google engineer's public side project maps Gemini 4 Hydrogen to the Flash tier and an unannounced Gemini 4 Helix to Flash-Lite

A commit in a public GitHub project names two unannounced Gemini 4 models and the tiers they fill: Gemini 4 Hydrogen as Flash and Gemini 4 Helix as Flash-Lite. The project is a personal Docker setup for Google's Antigravity coding tool, and the account's GitHub profile says its owner works at Google. ArtificialWatch read the commit directly. It was made at 04:20 UTC on November 10, and @LuminaBench flagged it at 19:45 UTC.

WHAT THE COMMIT SAYS

• Its message: redirect the flash and flashLite tiers to Gemini 4 Hydrogen and Helix.
• For Flash it prefers gemini-4-hydrogen-medium, then -high, -tiered and plain gemini-4-hydrogen, and falls back to gemini-3.8-flash-tiered.
• For Flash-Lite it prefers gemini-4-helix-medium, then -high, -tiered and plain gemini-4-helix, and falls back to gemini-3.5-flash-lite.
• The Pro tier already pointed to gemini-4-argon-medium or -high.
• Its tests use display names such as 'Gemini 4 Hydrogen (Medium)' and 'Gemini 4 Helix (Medium)'.

WHY IT IS STILL A RUMOR

• It is one person's side project, not a Google repository or announcement, and the ids could be the author's guesses rather than names Google serves.
• Accounts on X have tied Hydrogen to Gemini 4 Flash since October 27, and @lyraxana said on November 9 that a Hydrogen early-access program had started. Helix has not appeared in anything ArtificialWatch has read before.
• Helix breaks the element naming of Argon, Carbon, Hydrogen and Krypton, a point @LuminaBench also made.
• Google has announced neither model. At 19:55 UTC, the Gemini API's models page lists only gemini-4-argon and gemini-4-carbon from the Gemini 4 line, and OpenRouter has no hydrogen or helix id.

WHAT WE DO NOT KNOW

Whether Helix is a real Google model, and when either model ships. ArtificialWatch now hunts any Gemini id containing helix, as it already does for hydrogen, so a release sends an alert.