AI BriefingGoogle Antigravity adds Claude Opus 5.5 and Sonnet 5.5 for multi-model workflows
·2026.10.20 09:00
Key point
The models are available across Antigravity 2.0, CLI, and IDE extensions, billed pay-as-you-go rather than from pooled Gemini quotas.
Details
- Claude Opus 5.5 and Claude Sonnet 5.5 are now available in Google Antigravity for Google Cloud customers, selectable via the model picker in Antigravity 2.0, CLI, and IDE extensions.
- Usage is billed pay-as-you-go through existing Google Cloud Billing accounts and does not draw from pooled Gemini Enterprise Standard or Plus edition monthly token quotas.
- The article outlines two engineering patterns: cross-model verification using one model as implementer and another as judge, and pairing reasoning models with Flash subagents for high-volume tasks.
- Administrators must enable overage billing and authorize partner models in the Google Cloud Console or via Model Garden for the Gemini platform.
- Lightweight first-party Gemini models continue to run in the background for client-side coordination and consume first-party tokens.
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