Judging by apples bugfix trackrecord (they haven't fixed any of my reported bugs in the last 8 years at least), you will probably have to wait until Xcode 27 at best or never at worst.

When i manually set the model in ~/Library/Developer/Xcode/CodingAssistant/codex/config.toml it is still not working.

Thanks, but I don't know what I am supposed to do with that information. If I am not signed in, I can't switch the used model.

You can't really sign in with an access token. Because OpenAI vibecoded their whole backend, for some reason you cannot use your plan by using Access Tokens, only metered billing.

Yes, but Xcode 26 had different values set as default. Probably an issue with default migration.

Issue still persists

Still not working. "We can't process your request." Can't create new versions.

Its clear that you only work on toy projects. Try working on anything with 100k+ lines, then you will see how your "light" frameworks scale if you need to create 100 of them just for namespacing.

Enabling com.apple.dt.XCBuild EnableSwiftBuildSystemIntegration is what CAUSED the issue for me. Disabling it solved it.

OutlineGroup is a joke IMHO, it neither has the style nor the featureset of a real NSOutlineView.

@eskimo When pipe.fileHandleForWriting.closeFile() is called, the process exits with singal 9 (SIGKILL). When I try to acquire the file handle manually, the NSException thrown says [NSConcreteFileHandle fileDescriptor]: Bad file descriptor. So what's up with that last line?