The antigravity-preview-09-2026 update introduces a dedicated Linux sandbox and updated toolsets to Google AI Studio and the Interactions API. This version runs on Gemini 3.8 Flash and includes a Files API for moving data in and out of the sandbox, alongside a Credentials API that restricts agent access to approved destinations like GitHub or Slack without exposing actual tokens.

Internal tests for the new harness showed that the model uses 40% fewer output tokens on file changes and achieves 6% higher task completion for research and software engineering. Cache hit rates for long conversations increased 16% in the same testing period. The system allows agents to plan, test, and troubleshoot tasks autonomously until a user-defined goal is completed.