Bloomberg: Apple now targeting iOS 26.4 for long-delayed Siri AI upgrade

A Bloomberg report indicates Apple's upgraded AI Siri experience is now slated for release with iOS 26.4 in March 2026, delayed from an initial target of fall 2024 due to engineering challenges and a buggy hybrid architecture. These setbacks have led to executive reshuffling, with AI head John Giannandrea reportedly sidelined and Craig Federighi and Mike Rockwell now leading the project, which involves a ground-up rebuild of the core technology. While Apple acknowledges the delays, focusing instead on Apple Intelligence and developer tools at WWDC 2025, plans are in place for a more advanced Siri functioning as a real-time digital copilot in the future.

Analysis

Apple's significantly enhanced AI-powered Siri is now reportedly targeting a March 2026 release, as part of iOS 26.4, a substantial delay from its original fall 2024 timeline and subsequent internal postponements. This protracted development cycle, attributed to fundamental engineering challenges including a "buggy hybrid architecture" that necessitated a "ground-up rebuild" of the core "Siri LLM" technology, underscores execution difficulties within Apple's AI division. These setbacks have prompted notable executive restructuring, with AI head John Giannandrea reportedly reassigned from Siri and consumer-facing projects, and leadership now falling to Craig Federighi and Mike Rockwell. While Apple publicly acknowledged at WWDC 2025 that the Siri work "needed more time to reach our high quality bar," the absence of a Siri demonstration and the shift in focus to the broader "Apple Intelligence" platform and developer LLM tools highlight the ongoing struggles with its flagship voice assistant. The strongly negative sentiment (-0.8 for AAPL) associated with this news reflects investor concern over Apple's ability to deliver on its AI ambitions in a timely manner, despite its long-term vision for a more proactive, copilot-like Siri.

Key Decisions for Investors

• Investors should view the new March 2026 timeline for the upgraded Siri with caution given the history of repeated delays, and monitor for potential further impacts on Apple's competitive standing in the AI assistant landscape.
• Closely track upcoming Apple announcements and developer conferences for concrete evidence of progress on the Siri LLM rebuild and successful integration with the broader Apple Intelligence ecosystem, particularly under the new project leadership.
• Assess the risk that prolonged Siri development issues may allow competitors to consolidate their lead in AI-driven user interaction, and weigh whether Apple's other AI initiatives can mitigate this specific product lag.
• Consider the executive reshuffle as a signal of Apple's commitment to addressing the Siri challenges, but maintain a watchful stance until tangible product improvements are demonstrated and successfully launched.