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Xcode 26.4 Delivers Swift 6.3, Instruments Power Tools, and Critical Sanitizer Fixes Apple made Xcode 26.4 (17E192) publicly available on March 24, 2026, as a Release Candidate build. It bundles Swift 6.3 alongside the largest single-update expansion of Instruments in the Xcode 26 cycle, plus substantial testing

Xcode 26.4 is live. Instruments now compares profiling runs, surfaces top functions instantly, and shows per-CPU-core activity. Swift 6.3 included. Sanitizer hang on OS 26.4 fixed. Full breakdown on AdwaitX. #AdwaitX #Xcode264

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Xcode 26.4 Beta 3 Drops With Swift Testing, Instruments, and Localization Improvements Apple shipped Xcode 26.4 beta 3 on March 9, 2026, targeting iOS, macOS, tvOS, watchOS, and visionOS 26.4 compatibility testing. Unlike Xcode 26.3, which introduced agentic coding with Claude Agent and

Xcode 26.4 beta 3 (17E5179g) is live. Swift Testing now attaches visual output. Instruments gets Run Comparison and Top Functions. String Catalogs finally support cut, copy, and paste. #AdwaitX #Xcode264 #iOSDev

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Xcode 26.4 Beta 2: Every Verified Change and What It Fixes for Real Workflows Apple pushed Xcode 26.4 Beta 2 on February 23, 2026, and the build number 17E5170d signals a deliberate refinement cycle, not a headline feature drop. Where Xcode 26.3 introduced agentic coding with Claude Agent and OpenAI

Xcode 26.4 Beta 2 is here. Swift Testing now attaches images to test results. String Catalogs finally support copy, paste, and language removal. AdwaitX breaks down every verified change. Read now #AdwaitX #Xcode264 #iOSDev #Apple

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