Gemini Enterprise: Anthropic Claude Opus 5.5 and Claude Sonnet 5.5 in AI developer tools

Gemini Enterprise: Anthropic Claude Opus 5.5 and Claude Sonnet 5.5 in AI developer tools

Administrators can enable Anthropic Claude Opus 5.5 (claude-opus-5-5) and Anthropic Claude Sonnet 5.5 (claude-sonnet-5-5) for AI developer tools (Antigravity 2.0, Antigravity CLI, and Antigravity for IDEs). Third-party models are turned off by default:

• In-console Terms of Service consent flow: Administrators can opt in to Claude Opus 5.5 and Claude Sonnet 5.5 directly in Gemini Enterprise > Settings > AI developer tools > Antigravity authorized models in the Google Cloud console without a separate Anthropic account or onboarding. For more information, see Configure AI developer tools settings.
• Location availability: Third-party model inference is available in the global, us, and eu locations (in-country regions aren't supported). For a list of countries and regions that can access the model, see Anthropic's Supported countries and regions.
• Consumption billing: Third-party model usage is billed as consumption on your Cloud Billing account and counts toward your project's spend cap, which covers all models. Overages must be turned on before you can enable a third-party model. For more information, see Configure overages and the Cloud Billing SKUs for Anthropic Claude Opus 5.5 and Anthropic Claude Sonnet 5.5.
• Thinking levels: Developers sign in with their existing Gemini Enterprise license and select Claude Opus 5.5 or Claude Sonnet 5.5 in the model picker at a thinking level of Low, Medium, High, or Max (for example, Claude Opus 5.5 (High)). Medium is the default.