Gemini 3.5 Flash, Google's strongest agentic and coding model yet, is the default model in Google Antigravity. Antigravity 2.0 is an agent-first platform focused on helping developers build software using an army of AI agents that work autonomously. Gemini 3.5 Flash in Antigravity balances performance and speed. Antigravity's agents can build a fully operational OS using only Gemini 3.5 Flash.