SLAX 1.1 was introduced in Junos 12.2 as libslax version 0.11.22. No libslax updates have been committed into Junos since that time until Junos 14.1 when the version of libslax included by Junos was updated to 0.14.1. To see a list of the various SLAX enhancements that were introduced in Junos 14.1 as a consequence of this libslax upgrade, see the article titled SLAX 1.1 enhancements released in Junos 14.1.