Dehaze option is not available with Lightroom 6 (Perpetual Licence)
The feature is only available with Lightroom Creative Cloud( LR CC 2015)
Please let me know if it helps.
does lightroom 6 have dehaze available?
As mentioned previously it is blocked but you can invoke it easily.
If you have a look at this thread there are various ways to invoke the filter - Invoke the Dehaze effect in LR6 including a Plugin with a slider.
Please note that it is not a very useful feature and, along with the HDR and Panorama features, is not up to the normal standards of the engineers at Adobe.