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When will KMP support XCode 26.5? Looking forward to all the cool features announced in WWDC. Has anyone here tried 2.4.0 with XCode 26.5?

Could you please elaborate what you mean by support? I use KMP with XCode 26.5 from its release and didn't face any issues so far.

<https://kotlinlang.org/docs/multiplatform/multiplatform-compatibility-guide.html#version-compatibility>

For now I don't see any issues reported for XCode 26.5, so the next Kotlin version should officially support it. 
Regarding Kotlin 2.4.0, its development has been completed before XCode 26.5 has been released, so It most probably wasn't tested and this is why it's not added to the document you have provided.
If you face any specific issues you can report them to YouTrack, so the fix will land into Kotlin 2.4.10