StepFun's StepX Neo is a phone that runs on AI agents, not apps

A Chinese startup shipped a phone with no app grid. You tell it what you want, and an agent does it.

What StepFun announced

StepFun, the Shanghai AI company backed by Tencent, unveiled the StepX Neo at an event on July 13, 2026 and called it the world’s first agentic smartphone.

The phone runs Step AOS, a custom operating system built from Android, Linux and RTOS components, with the AI agent embedded at the system level rather than installed as an app. The built-in assistant, Amoo, takes a single natural-language request and chains tasks across apps, web tools and the phone’s own functions. Its core tasks run on-device and fully offline. The hardware has a dual camera and a secondary display on the back for notifications and quick AI actions.

Why the OS is the news

Apple, Google and OpenAI have all talked about AI-first devices. StepFun shipped one first, and it did so by rewriting the operating system around the agent rather than adding a chatbot to a launcher. The difference shows up in what the agent can reach: an assistant that lives at the system level can act across apps, while an app-level chatbot can mostly only talk.

Offline execution is the other notable choice. Running core tasks on-device removes the network dependency and keeps the request on the phone, which matters for both latency and privacy.

What the reviews will decide

The claim that agents can replace apps rests on reliability. A phone that hides its apps behind an assistant is only an improvement if the assistant completes tasks correctly most of the time, and that is the question every hands-on review of the StepX Neo will answer.