Hi,
According to the description of the Xcode 15 RC Download Page,
For development with the visionOS SDK, continue to use Xcode 15 beta 8.
You can still use beta 8 instead.
I suppose the visionOS is still beta, so the release version of Xcode doesn't include visionOS SDK.
Topic:
Developer Tools & Services
SubTopic:
Xcode
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