AIAntigravity preview upgrades its agent runtime and introduces a Credentials API
The announcement claims lower coding and reasoning costs and says the new authentication API uses placeholders to keep secrets out of the model’s context.
TLDR
The September 17 announcement says antigravity-preview-09-2026 defaults to Gemini 3.8 Flash, with an option to configure another default model. It describes a persistent Linux sandbox, file and search tools, and reusable agent configurations. It claims 30% lower costs for multi-turn coding and 17% lower costs for reasoning, attributing both to higher cache hit rates. It also claims 40% fewer tokens on file edits and up to 8% higher task completion on software engineering and research evaluations. A follow-up announcement describes a Credentials API for authenticating with external services and MCP servers. It says the model sees placeholders rather than secrets, while a proxy inserts real tokens only for approved domains and blocks attempts to send them to other hosts.
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Antigravity preview upgrades its agent runtime and introduces a Credentials API
The announcement claims lower coding and reasoning costs and says the new authentication API uses placeholders to keep secrets out of the model’s context.