Google Antigravity Adds Hidden Gemini 4 Argon References With Three Reasoning Levels

New hidden references to Gemini 4 Argon inside Google Antigravity point to low, medium and high reasoning-effort variants, while Gemini Apps now documents the same three thinking levels for manually selected models. The signals suggest Google is aligning model controls across its consumer and agentic coding surfaces, but they do not amount to a public Argon launch in Antigravity.