iH8sn0w, a well-known and reputable hacker in the jailbreak community, has demonstrated an iOS 9 untethered jailbreak running on his iPhone 5. The jailbreak demonstrates Verbose booting, a custom boot logo, code injection, and Cydia.
iH8sn0w is running the just-released iOS 9 GM seed on his iPhone, as proven by the 13a340 build number seen in the About section of the Settings app. Watch the full jailbreak video demonstration, and see for yourself.