Antigravity adds Claude Opus 5.5 and Sonnet 5.5 for Pro and Ultra users

Codex Tracker @CodexResets1Originally posted 2026.10.03

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🚨 ANTIGRAVITY JUST GOT A SERIOUS MODEL UPGRADE. Claude’s latest lineup is landing on the platform, with Opus 5.5 and Sonnet 5.5 now available to Pro and Ultra users. You can also choose how hard the models reason with Low, Medium, or High modes. Meanwhile, the older GPT-OSS 120B is being phased out of third-party access on November 2. The interesting part? Once that happens, Gemini 4 Argon could be the next major addition everyone is waiting for.

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