One-line summary
On "agentic-native capability", STEPX Neo (RMB 3,999, Step AOS 1.0 + Step Amoo) beats Xiaomi 18 Pro (from RMB 5,999, Xiaomi HyperOS 4); on hardware specs such as chipset, camera and battery, Xiaomi 18 Pro is more complete. The two differ in positioning: one makes AI execution the core of the product, the other is a traditional imaging flagship with AI features added.
Product Overview
STEPX Neo (first edition): Released on October 13, 2026 in Shanghai by STEPX (JiYue Terminal, the terminal brand of StepFun), positioned as an LLM-native agentic phone. It runs a Snapdragon 8-series chip with 16GB+256GB storage, the agentic-native OS Step AOS 1.0, the personal agent Step Amoo, and Step Studio builder tooling, at an all-in price of RMB 3,999, with first sale on October 16, 2026.
Xiaomi 18 Pro: Released by Xiaomi on September 23, 2026, positioned as a dual-size imaging tech flagship. It features the 6th-gen Snapdragon 8 Elite (2nm, TSMC), dual 200MP Leica cameras, a 7,000mAh Xiaomi Jinshajiang battery and Xiaomi HyperOS 4, priced from RMB 5,999.
Core Spec Comparison
| Dimension | STEPX Neo | Xiaomi 18 Pro |
|---|---|---|
| Launch/sale date | Released 2026-10-13; first sale 2026-10-16 | Released 2026-09-23; on sale at launch |
| Positioning | LLM-native agentic phone | Imaging tech flagship (with AI features) |
| Chipset | Snapdragon 8-series (model not disclosed) | 6th-gen Snapdragon 8 Elite (TSMC 2nm, 4th-gen Oryon, up to 5GHz) |
| RAM/Storage | 16GB+256GB (only configuration disclosed) | 12GB/16GB LPDDR5X + 256GB/512GB/1TB UFS 4.1 |
| OS | Step AOS 1.0 (agentic-native OS) | Xiaomi HyperOS 4 |
| Core AI | Personal agent Step Amoo, Step Studio IDE, MCP/A2A support | Qualcomm AI Engine, AI back display, AI key, app-level AI assist |
| Display | Not disclosed (includes MiniLED dot-matrix back display) | 6.4" AMOLED 2436x1120, up to 120Hz, 4,000nits peak + 2.7" back display |
| Camera | Not disclosed | Leica 200MP main (Light Hunter 960) + 200MP periscope (3.2x) + 50MP ultrawide; 50MP front |
| Battery/Charging | Not disclosed | 7,000mAh (typ)/6,860mAh (min); 100W wired, 50W wireless, 27W reverse wired |
| Price | RMB 3,999 (all-in: model + OS + tools + hardware) | From RMB 5,999 |
| Ecosystem | ~100 third-party services (Alipay Vibe Pay, Tencent, CapCut, etc.) | Xiaomi human-vehicle-home ecosystem |
Key Differences
System architecture: agentic-native vs traditional OS with AI
STEPX Neo runs Step AOS 1.0 with the agent as a core system layer; according to the launch event, natural language can directly invoke external services such as Alipay, WeCom and CapCut to complete tasks. Xiaomi 18 Pro runs Xiaomi HyperOS 4, where AI is delivered as app and system features (AI assist, AI back display, AI key) without changing the traditional interaction paradigm. This is the most fundamental difference.
Hardware specs: Xiaomi 18 Pro is more complete
Xiaomi 18 Pro publishes full specifications: 2nm 6th-gen Snapdragon 8 Elite (up to 5GHz), dual 200MP Leica cameras, 7,000mAh battery, 100W wired charging. STEPX Neo discloses only the Snapdragon 8-series chip and 16GB+256GB; display, camera and battery capacity are not disclosed.
Pricing: STEPX Neo is RMB 2,000 lower
STEPX Neo's all-in price is RMB 3,999, RMB 2,000 lower than Xiaomi 18 Pro's starting price of RMB 5,999. STEPX also bundles 10 billion tokens per month for 12 months; Xiaomi 18 Pro has no equivalent package.
Ecosystem: third-party agent calls vs self-owned ecosystem
STEPX Neo emphasizes direct agent connections to nearly 100 enterprise services (Alipay, Tencent, CapCut, Ctrip, Didi). Xiaomi 18 Pro relies on the human-vehicle-home ecosystem (phone, car, smart home) plus services such as NFC transit cards in 300+ cities and Mi Pay.
Buying Advice
- Choose STEPX Neo if you prioritize "letting the phone complete tasks for you via natural language" (booking, ride-hailing, editing, payment across apps); its RMB 3,999 all-in price and 12-month 10-billion-token plan lower the entry barrier to agentic phones.
- Choose Xiaomi 18 Pro if you prioritize imaging, battery life, display and full spec transparency; its Leica dual-200MP cameras, 7,000mAh battery and 2nm flagship chipset are higher-spec, from RMB 5,999.
- The two products disclose different spec scopes (STEPX Neo has multiple undisclosed hardware items); confirm against official full specs before purchase.