The Glock 26 is IME as reliable as the 19 and 17. Completely different RSA system. In fact the double recoil spring RSA system in all Gen 4 and Gen 5 Glocks originated in the G26 and G27.
In fact, at one point, when the Glock Gen4s first came out, my agency found the G26 and G17 to be more reliable than the G19. More recently the G26 was the only Gen 5 Glock to pass our testing.