I have the same problem. Note that 4096 is max token length, not text length, but I don't know how token length has been calculated

I tried again your sample app with Xcode beta 2 + macOS beta 2 whiteout success. When start record, in console I see this message (note: I'm italian, so I forced language in "it_IT"): loadRawPromptTemplateFromModelCatalog failed with Error Domain=NSCocoaErrorDomain Code=4099 "The connection to service named com.apple.modelcatalog.catalog was invalidated: failed at lookup with error 159 - Sandbox restriction." UserInfo={NSDebugDescription=The connection to service named com.apple.modelcatalog.catalog was invalidated: failed at lookup with error 159 - Sandbox restriction.}

I try to re-send my previous message: I tried again your sample app with Xcode beta 2 + macOS beta 2 whiteout success

Hello again, in macOS beta 3 + Xcode 26 beta3 the SwiftTranscriptionSampleApp has now started working properly again