No, according to what is on the side plate. Calls for nothing greater than 13mm. Same for 2.6. Same for tiny swivabiner, oddly.
I’ve had the buck ox in my hand which is similar in size and diameter to the 2.6, seems to have about the same physical dimensions, but is rated for 16mm. Why that is, and the 2.6 is rated for 13mm, I can’t tell you. But my experience running 14mm in a 2.6 is that it works fine.
The 1.5, with a 14mm rope, I wouldn’t do routinely. Maybe if I were out of rigging devices and using it as a redirect for a branch or two. Otherwise… my advice with that block is to stick w 1/2” or 12mm.