Latest Headless Chrome 65 user agents:

User Agent Platform Device
Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/65.0.3325.181 Safari/537.36 Windows 8 Unknown
Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/65.0.3325.146 Safari/537.36 Windows 8 Unknown
Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/65.0.3312.0 Safari/537.36 Windows 8 Unknown
Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/65.0.3325.181 Safari/537.36 Windows 7 Unknown
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/65.0.3325.181 Safari/537.36 Windows 10 Unknown
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/65.0.3312.0 Safari/537.36 Windows 10 Unknown
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_4) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/65.0.3325.181 Safari/537.36 Mac 10 Unknown
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_3) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/65.0.3325.181 Safari/537.36 Mac 10 Unknown
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_3) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/65.0.3325.162 Safari/537.36 Mac 10 Unknown
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/65.0.3325.181 Safari/537.36 GNU/Linux Unknown