Antigravity rumored to get Opus 5.5 and Sonnet 5.5, with Gemini 4 Argon possibly next
A leak claims Antigravity will add Opus 5.5 and Sonnet 5.5 with Low, Medium and High reasoning effort, that GPT-OSS 120B may be phased out, and that Gemini 4 Argon could fill the slot.

🚨 Antigravity Reportedly Got A Serious Model Upgrade >Claude's latest lineup reportedly landing on Antigravity Opus 5.5 and Sonnet 5.5 for Pro and Ultra users (not independently confirmed by me) >Reportedly lets you pick reasoning effort: Low, Medium, or High >GPT-OSS 120B reportedly being phased out of third-party access, claimed date November 2 unconfirmed >If that timeline holds, Gemini 4 Argon could be next in line to fill the slot, especially since Argon already shipped September 30