Multi-Model Agentic Workflows: Claude Opus 5.5 & Sonnet 5.5 Land in Google Antigravity 馃殌
Different software engineering problems require different model strengths. While a quick lint fix or unit-test classification doesn鈥檛 warrant a heavy reasoning frontier model, refactoring a legacy service across thirty files definitely does. Anthropic鈥檚 Claude Opus 5.5 and Claude Sonnet 5.5 are now
Different software engineering problems require different model strengths. While a quick lint fix or unit-test classification doesn鈥檛 warrant a heavy reasoning frontier model, refactoring a legacy service across thirty files definitely does.
Anthropic鈥檚 Claude Opus 5.5 and Claude Sonnet 5.5 are now officially available in Google Antigravity (across Antigravity 2.0 Desktop, the CLI, and IDE extensions for VS Code, JetBrains, and Visual Studio).
Here is a breakdown of what this means, along with two architecture patterns you can run right away.
Having multiple model families inside one agent harness unlocks powerful hybrid workflows.
Using the same model to both author code and critique its own changes creates blind spots. By splitting planning/implementation and validation across different model families, you catch regressions before PR review:
Running full codebase grep searches or test triage loops against frontier reasoning models blows through latency and budget.
Using Antigravity鈥檚 subagent configuration (.agents/agents/*.md ), you can offload mechanical tasks to model: flash while keeping frontier models for reasoning: