Phoenix.new – The Remote AI Runtime for Phoenix · The Fly Blog

Phoenix.new is an LLM coding agent platform built for Elixir and Phoenix that runs entirely in the browser but provides both the user and agent with root access to an isolated ephemeral virtual machine, allowing agents to install system packages and run programs freely without affecting the local machine. The system includes a full headless browser that lets agents verify front-end changes by observing real page content and JavaScript state, and automatically deploys generated applications to the cloud with shareable URLs and integrated Fly.io infrastructure, eliminating the traditional gap between rapid prototyping and production deployment.

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