Google I/O 2026 was, almost in its entirety, a bet on the "agentic era." Across roughly two hours at Shoreline Amphitheatre, Sundar Pichai, Demis Hassabis and a rotating cast walked through a model, a world simulator, a developer platform, a personal agent, a rebuilt Search and an agentic-commerce stack. The most revealing thing about the keynote is what the flagship was not: not "Gemini 4.0," but a fast, cheap workhorse called Gemini 3.5 Flash.