Google's Antigravity hides Gemini 4 Argon references as staff test a stronger Carbon checkpoint
testingcatalog · x · 2026-10-10
testingcatalog spotted hidden references to Gemini 4 Argon in Google's Antigravity, with low/medium/high reasoning-effort options; Gemini web has also unified its thinking-effort selector across models, hinting at Gemini 4 preparation.
- Argon was officially announced Sep 30, first to cybersecurity partners, with paid API and AI Ultra subscribers to follow.
- Per Business Insider, Google employees are internally testing a separate Gemini 4 checkpoint, Carbon, which reportedly feels Claude Opus 5.5-level on coding; Barium-B is the checkpoint chosen for the public Argon release.
- The internal coding tool "Jetsky" mentioned in the report is an internal name for Antigravity (not the IDE version).
Related event: Gemini 4 Argon Surfaces Across Google Platforms Ahead of Launch(4 posts)→
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