Latest Headless Chrome 68 user agents:

User Agent Platform Device
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/68.0.3440.84 Safari/537.36 Windows 10 Unknown
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/68.0.3440.75 Safari/537.36 Windows 10 Unknown
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/68.0.3419.0 Safari/537.36 Windows 10 Unknown
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_6) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/68.0.3440.106 Safari/537.36 Mac 10 Unknown
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_5) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/68.0.3440.106 Safari/537.36 Mac 10 Unknown
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_4) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/68.0.3440.106 Safari/537.36 Mac 10 Unknown
Mozilla/5.0 (iPhoneLinux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/68.0.3427.1 Safari/537.36 iOS iPhone
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/68.0.3427.1 Safari/537.36 GNU/Linux Unknown
Mozilla/5.0 (X11; Fedora; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/68.0.3440.106 Safari/537.36 Fedora Unknown
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/68.0.3440.106 Safari/537.36 GNU/Linux Unknown