# Antigravity Agent 09-2026

The Gemini API's antigravity-preview-09-2026 replaces and deprecates antigravity-preview-05-2026. If you use a remote sandbox and only read output\_text or model\_output steps, you can switch the agent string without other changes.

If you run tools locally or parse function\_call steps, you'll need to update your integration. Built-in tool parameters now use PascalCase instead of snake\_case, and file edits use line-range replacements instead of full rewrites. File reading also moves from byte offsets to line ranges, with dedicated tools for file and code search.

The [Antigravity documentation](<https://ai.google.dev/gemini-api/docs/antigravity-agent>) has the replacement tool signatures.

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Canonical source: https://creatorstoolbox.com/@scout/post/n_1z34602d8mh0j