Opera User Agent Strings: Opera 15 and Beyond
If you track user agents visiting your sites, please adjust your scripts for Opera 15 for desktop and Android.
Desktop's UA string (on Windows) is
Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/28.0.1500.52 Safari/537.36 OPR/15.0.1147.100
On all platforms, the digits after "OPR/" tell you version and minor version number - in this case "15.0". (The subsequent numbers are internal identifiers and build numbers.)
Opera 15 for Android contains the string "Mobile" and also contains "OPR/" followed by version number, as both Opera 15 for desktop and Android are based on Chromium 28.
Opera Mini continues to use Presto on the server, and its UA string is unchanged; it contains the string "Opera Mini".