Google announced that the Gemini 3.5 Flash model – the company’s most capable model for long‑running coding and agent tasks – is now generally available (GA). It replaces the older Flash‑lite versions and is the default for the new gemini‑flash‑latest alias. At the same time, Google opened a public preview of Managed Agents, letting developers run autonomous, stateful agents in a secure Google‑hosted Linux sandbox. The preview includes a general‑purpose Antigravity Agent (antigravity‑preview‑05‑2026) that can plan, write code, manage files and browse the web inside its sandbox.
What’s new for developers?
Developers can call gemini‑3.5‑flash through the normal Gemini API endpoint and get better performance on complex reasoning, code generation and multi‑step workflows. The Managed Agents preview adds a new /agents endpoint and a quick‑start guide, so you can create an agent, give it a prompt, and let it run for hours while preserving its state between calls. The Antigravity Agent is the first ready‑made agent in the preview, useful for tasks that need browsing or file manipulation.
How to get started
If you already have an API key, switch your model identifier to gemini‑3.5‑flash or use the alias gemini‑flash‑latest. To try the agents, enable the “Managed Agents” preview in the Google Cloud console, then follow the quick‑start example that shows how to spin up the antigravity‑preview‑05‑2026 agent. The Antigravity agent will be shut down on 5 Oct 2026, so plan to migrate to a newer preview if you need it beyond that date.
Why it matters
For everyday developers, the new Gemini 3.5 Flash means faster, more reliable code‑generation and reasoning without paying for larger models. The Managed Agents preview lets small teams build autonomous assistants that keep context between calls, opening up new possibilities for chat‑bots, data‑scraping tools, or automated reporting without managing their own servers.
