Why is Apple delaying Siri's overhaul?

Reported obstacles in internal testing

Apple’s effort to replace and expand Siri with a much more capable, Gemini‑powered assistant has hit recurring roadblocks in internal testing. Company sources and reporting say engineers found key features to be slow and prone to inaccuracies; the systems also require broader and more reliable access to user data to deliver the personalized experiences Apple wants.

Those technical shortcomings have forced Apple to shift parts of the planned rollout out of the iOS 26.4 update and into later releases. Bloomberg and other outlets report that some personalized Siri functions expected with 26.4 may instead arrive in iOS 26.5 or beyond, and industry coverage has suggested the most ambitious components could be delayed into late 2026 at the earliest.

What's causing the delays

• Latency and accuracy issues during end‑to‑end testing, meaning features felt slow or produced wrong results.
• Data‑access and privacy tradeoffs that complicate how the assistant personalizes responses while meeting Apple’s privacy commitments.
• The sheer engineering complexity of tightly integrating a next‑generation large‑model brain into device and cloud workflows without regressions.

What this means for users and Apple

• Users will see new Siri capabilities arrive more gradually rather than as a single, large switch‑on.
• Competitors and partners will have extra time to race on comparable features; Apple is balancing capability against performance and privacy.

Apple has not published a new shipping timetable in public reporting; therefore it remains unclear exactly when the full set of planned features will appear or how Apple will sequence incremental launches amid ongoing testing.