Improved Query Performance with Compatibility Level 130 in Azure SQL Database でアナウンスがあったのですが、2016/6 から新規に作成したデータベースの互換s例ベルが 120 から 130 に変更となるようです。
Starting in June 2016, the Azure SQL Database default will change from 120 to 130 for newly created databases. Databases created before June 2016 won’t be affected and will keep running at the Compatibility Level they were initially created with (100, 110 or 120). The same goes for databases migrated from Azure SQL Database v11 to v12.