iOS 26.1 Beta 4

Release identity

This article enriches the existing iOS 26.1 Beta 4 route dated 2025-10-20. It does not alter the audited timeline date or create a second event.^[1]

Sequential archive comparison

The before and after payloads preserve different Apple note states around iOS 26.1 Beta 4. The earlier payload still calls itself Beta 3; the next state calls itself Beta 4, moves the Lock Screen issue to Resolved Issues, and adds the WebKit stderr-trace warning.^[2][3]

Documented Beta 4 delta

The structured comparison yields 2 substantive items. Each occurrence retains the Apple component, status heading, and issue-number locator used during review.^[2][3]

Attribution boundary

The title transition anchors the documentary change to Beta 4. The baseline was captured on the Beta 4 calendar date before Apple's note page changed state, so this is a timestamped documentation-boundary inference rather than a claim about seed publication time.^[2][3]