Google's Antigravity AI Tool Built and Deployed a Full Agent in Three Hours

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At Google's Build with Gemini event in Sunnyvale, a developer spent three hours using Antigravity, Google's agent-first coding tool, to build a hackathon tracker called Sprint Ledger. The tool autonomously built, deployed, published the project to a public repository, and even recorded its own demo video. The event was part of Google Cloud's Build with Gemini World Tour, featuring tracks for business, platform, and app builders. Google also unveiled Gemini 3.8 Flash, released September 2, 2026, touted as their best reasoning and coding model yet at competitive pricing. While the results impressed the developer, he noted the tool left behind consistent gaps — one of which appeared visibly in the demo video it produced.

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