Apple rebuilt Siri from the ground up after scrapping first version that 'didn't deliver'

Apple's AI-Driven Overhaul of Siri Required Complete Rebuild

Apple has finally explained the lengthy delay behind Siri AI, revealing that the company abandoned an initial working version of its digital assistant in favor of a complete reconstruction. Mike Rockwell, who assumed leadership of the Siri platform in 2025, disclosed during a post-WWDC press roundtable that Apple had "actually built a first version of this that was sort of incremental on top of the original Siri that added tool calling, and we had it working." However, the team concluded this approach wasn't delivering on their vision for what the new AI-powered Siri should be 2

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Decision to Rebuild Siri From the Ground Up Delayed Launch

Rather than settle for incremental improvements, Apple made the strategic decision to completely tear down the existing infrastructure. "We rebuilt Siri from the ground up, literally, tore it to the ground," Rockwell explained, noting that the new architecture sits atop the Apple Intelligence Foundational Models 4

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. This fundamental shift in approach explains the two-year gap between the original announcement at WWDC 2024 and the actual delivery in iOS 27. The result is what Rockwell describes as "a profoundly more capable Siri" that functions as its own application and serves as a natively multimodal AI assistant with privacy built into its core design 3

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Consistent Cross-Device Experience Addresses Long-Standing User Frustration

One of the most significant improvements in the Siri overhaul addresses a complaint that has frustrated users for years: fragmented capabilities across Apple's ecosystem. David Clark, Apple's senior director of watchOS software engineering, emphasized in an interview with TechRadar that the company "really wanted to make sure the Siri experience is a singular and consistent experience, whether I decide to ask Siri on my wrist a question, or whether I have my phone in my hand" 1

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. The old Siri had different capabilities depending on whether you used it on iPhone, Apple Watch, HomePod, Mac, or Apple TV, creating an inconsistent user experience that undermined Apple's typically seamless ecosystem integration.

Privacy-Focused AI Assistant Works Across All Apple Platforms

The new Siri AI is now available across iPhone, iPad, Mac, Apple Watch, Vision Pro, CarPlay, and AirPods, with the same intelligence and capabilities on each platform 3

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. This unified approach means the voice assistant can access your data and personalize responses consistently regardless of which device you're using. The privacy-focused AI assistant maintains Apple's commitment to user data protection while delivering features like on-screen awareness and deep contextual understanding 4

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. For users with compatible hardware devices, this represents a fundamental shift in how Siri integrates into daily workflows across the Apple ecosystem, potentially setting the stage for new HomePod and Apple TV 4K releases that can fully leverage these enhanced capabilities.