Short answer: Amoo is a personal AI agent that StepFun built into Step AOS 1.0, the operating system of its STEPX Neo phone, launched in Shanghai on 13 October 2026. Instead of opening apps, you tell the phone what you want and Amoo carries out the steps. The early-access edition costs 3,999 yuan in China and went on sale on 16 October.

By Agent Playbox Editorial · Published · Updated

StepFun Amoo: the AI agent phone STEPX Neo launches

Key facts

What did StepFun launch on 13 October 2026?

On 13 October 2026 STEPX, the device brand of Chinese AI company StepFun, held its “Ready Builder One” event in Shanghai and launched the STEPX Neo, its first phone built around a large-model agent (Tencent News). The phone runs Step AOS 1.0, an agent-native operating system, and comes with Amoo, StepFun’s personal AI agent. Pre-orders opened at 21:00 that evening on JD.com, Tmall and Douyin, and sales started on 16 October at 10:13.

StepFun first showed the agent, the operating system and the STEPX brand in Shanghai on 13 July 2026, without a price or sales date (Decrypt, Caixin). The company’s message at launch was that in the agent era, AI is no longer an add-on to a smartphone but the product itself.

What can the Amoo agent do?

Goals instead of apps

Instead of opening a ride-hailing app, typing an address and picking a car, you tell the phone where you want to go and Amoo handles the remaining steps (Decrypt). At the July preview StepFun gave a travel example: plan a trip, search flights, suggest places to stay, book and save the itinerary without switching between apps (Gadgets 360). Users get two entrances: the familiar app grid and a separate space for the agent.

Memory you can manage

Amoo keeps two memories: one for your facts, habits and preferences, and one for what it has learned about carrying out tasks. StepFun describes its safety design as trusted, visible, controllable and reversible: you can see how a task ran, manage the agent’s permissions and memory, and undo actions (Tencent News).

Fast on the phone, deep in the cloud

Simple commands such as setting an alarm or changing a setting run on a small model on the phone, some of them offline. Harder requests that span several apps are planned by a larger model in the cloud and then carried out on the device. A six-microphone array helps Amoo hear you in noisy places, and a MiniLED dot-matrix screen on the back shows what it is doing (CNMO via Tencent News).

How much does the STEPX Neo cost and where can you buy it?

The early-access edition costs 3,999 yuan as what StepFun calls a full-stack price: the phone plus its Step models, the Step AOS operating system and the Step Studio developer tool (TechWeb via Sina). It comes in carbon black and silicon silver. Buyers get a 12-month STEPX Token Plan with a monthly AI allowance, reported as 10 billion tokens a month in Chinese launch coverage. StepFun has not said what the AI costs after the first year (Decrypt).

A launch programme gives the first 10,000 users who complete set tasks a “Star Ticket” to swap their STEPX Neo for any new STEPX device at no cost within five years. The phone is sold in China; availability in other countries has not been announced.

How does Step AOS let an agent run the phone?

StepFun says Step AOS was built from scratch for the agent rather than adding one on top. It mixes Android, Linux and real-time operating system parts, and breaks phone functions such as messaging, apps, files and settings into small blocks Amoo can call directly through the Model Context Protocol (MCP), a shared standard for connecting AI to software (Decrypt).

Services plug in the same way. Nearly 100 companies and products, including Alipay, Tencent, Ctrip, Didi, Amap, CapCut and Meituan, work with Amoo, and payments and bookings are completed on the partners’ own platforms. Tencent’s first integrations include WorkBuddy, WeCom and WeChat Read (Tencent News). Developers get Step Studio, which turns plain-language descriptions into AI apps, games, agents and skills and connects outside services through MCP and A2A.

What does Amoo mean for everyday users?

Amoo is a glimpse of a phone where the agent, not the app, is the main way you get things done: travel, local services, office tasks and creative work in one conversation. Because partners complete payments and bookings themselves, the approach is built on cooperation with the services people already use.

You can practise the same habits with any agent today. Our trip planning and rebooking and restaurant and appointment booking use cases, the travel concierge and errand runner templates, and skills such as trip itineraries and appointment booking show what to delegate first.

How does Amoo compare with Eney and Hark Pro?

Eney, launched by MacPaw on 15 October 2026, is a proactive assistant for Mac and iPhone that prepares the next step across your apps and asks before it acts. Amoo goes a level deeper by being part of the phone’s operating system. See Amoo vs Eney.

Hark Pro aims to be an operating system for your life, with a model trained for computer use and its own cloud computer. Both share the idea that the agent should be the interface. Side by side: Amoo vs Hark Pro. For more options, see the best personal AI agents of 2026.

What should you watch next?

Worth following: how StepFun prices AI after the first year, whether STEPX Neo or Step AOS reach markets outside China, and how many apps and skills developers build with Step Studio. StepFun is also preparing for a Hong Kong listing (Caixin), so more company news is likely.

We will update the Amoo profile and its comparisons as new facts are confirmed.

Timeline: how did we get here?

Agent snapshot: what do we know so far?

Facts below come from the agent profiles in our directory, each linked to its source.

Amoo at a glance

Full Amoo profile

Eney at a glance

Full Eney profile

Hark Pro at a glance

Full Hark Pro profile

Related comparisons and guides

Agents in this story

Amoo

personal agent

StepFun's personal AI agent built into Step AOS 1.0, the operating system of its STEPX Neo phone: tell the phone what you want and Amoo carries out the steps across apps and services.

Eney

personal agent

Proactive AI assistant for Mac and iPhone that spots what needs attention across your apps, files and calendar, prepares the next step and asks before it acts.

Hark Pro

personal agent

Personal AI 'operating system for your life' with its own cloud computer (Handoff), proactive Action Buttons and Panels; free with paid usage tiers.

Frequently asked questions

What is StepFun Amoo?

A personal AI agent built into Step AOS 1.0, the operating system of StepFun's STEPX Neo phone. You tell the phone what you want and Amoo carries out the steps across apps and services.

When did the STEPX Neo launch?

StepFun launched it in Shanghai on 13 October 2026. Pre-orders opened that evening and sales began on 16 October 2026.

How much does the STEPX Neo cost?

The early-access edition costs 3,999 yuan in China, including the Step models, Step AOS, Step Studio and a 12-month token plan.

Is Amoo available outside China?

Not announced. The phone is sold in China through JD.com, Tmall and Douyin.

Does Amoo work offline?

Partly. Simple commands run on a small on-device model, some without a network; complex tasks use a cloud model.

Sources

Updated