Apple’s long-awaited Siri AI overhaul is facing another delay, and the rollout now appears set to arrive in phases rather than as a single headline feature in iOS 26.4.
According to Bloomberg’s Mark Gurman, Apple encountered fresh issues during internal testing in recent weeks. Sources familiar with the project say the upgraded assistant does not always process requests correctly, and some queries take longer than expected to complete.
Fresh Bugs and Performance Delays Complicate Launch Plans
Apple initially targeted iOS 26.4, which is expected in March, but the company is now spreading parts of the upgrade across later releases. Some features could slip to iOS 26.5 in May, while more advanced capabilities may not arrive until iOS 27 in September.
The delay stands out because Apple first previewed the redesigned Siri in June 2024. At the time, the company positioned it as a major leap forward, promising a more personal assistant capable of understanding on-screen context, accessing relevant user data when appropriate, and executing complex tasks across apps.
Those advanced features now appear to be the most difficult to deliver reliably. Gurman says internal builds include a toggle that enables a “preview” of certain personal data features, which suggests Apple may warn users that early versions are incomplete or inconsistent.
Testing has also uncovered reliability concerns. Some deeper app control features reportedly fail in certain scenarios. Testers have flagged accuracy problems and a bug that interrupts users if they speak too quickly. In some cases, Siri falls back to its existing ChatGPT integration instead of relying on Apple’s new system.
The revamped Siri runs on a new architecture, reportedly codenamed Linwood, and is powered by Apple Foundation Models. Apple has also confirmed that Google’s Gemini models will support parts of the assistant. Despite these partnerships, Apple continues to stress its privacy-first approach, which limits how user data is processed or stored externally.
Apple maintains that the upgraded Siri will launch this year, but a full rollout now looks increasingly staggered.
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