An iPhone version of Doubao mobile assistant has emerged? Developer demonstrates controlling an iPhone using Opus 5.5
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Beating AI Express: Developer Finn Voorhees has demonstrated an AI agent capable of directly operating an iPhone. He only sent one prompt asking the agent to find the cheapest Ryanair flight to London for the next day. The agent then opened Ryanair on its own, input the destination, selected the date, checked fares, and finally returned to the chat interface to report the result—no computer was involved throughout the process. This agent runs in PiChat, an iPhone chat app developed by Voorhees. It leverages his previously open-sourced PiDurableKit at its core, running the Pi Agent on the iPhone via Apple’s JavaScriptCore to handle model calls, tool execution, and task management. The video uses Claude Opus 5.5, with model inference still running in the cloud. To enable the agent to continue working after switching to other apps, PiChat also uses Apple’s background task mechanism and saves execution progress via SQLite for easy resumption after interruptions. The most critical cross-app control code has not been made public. When activating iPhone Control in the video, the system required entering the lock screen password to enable XCTest UI automation. XCTest is Apple’s UI testing framework that can simulate taps, swipes, and text input. The open-source project TouchSynthesis leverages XCTest’s private interfaces to let iPhones generate touch events on their own, eliminating the need for real-time computer control. However, Voorhees has not confirmed whether he used this approach.
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