Google has released antigravity-preview-09-2026, a new version of its general-purpose managed agent for the Gemini API. It replaces May’s preview and now uses Gemini 3.8 Flash by default.
Antigravity can plan tasks, execute code, manage persistent files, search the web, and iterate inside a Google-hosted Linux sandbox. The updated filesystem interface adds dedicated filename and content search tools, while file editing now uses targeted line-range replacements instead of complete rewrites.
Developers using a remote sandbox and consuming only final outputs can migrate by changing the agent identifier. Integrations that execute tools locally or parse function calls must accommodate new PascalCase parameters and revised filesystem calls. Google will shut down the previous antigravity-preview-05-2026 version on October 5.
Why it matters
Agent infrastructure is becoming a first-class API product. Antigravity combines the model, execution harness, sandbox, web access, custom functions, MCP connections, background tasks, reusable environments, and scheduled triggers behind one interface.
That follows the same infrastructure direction we examined when OpenAI exposed the Codex harness through its Agents API: developers increasingly choose a managed agent runtime rather than assembling every context, tool, execution, and persistence layer themselves.
For builders, this creates a faster route to production-style research, coding, data-analysis, and operational agents. It also raises operational requirements: migrations must be tested, local tool schemas validated, token budgets bounded, progress monitored, and long-running work made cancellable.
The new Antigravity agent remains in preview through Google AI Studio and the Gemini API for free- and paid-tier projects. Usage follows pay-as-you-go pricing based on the selected model’s tokens and the tools the agent uses; free-tier projects include a limited quota.