Only a single A342 ever built would have had that range in pax configuration, and it never entered pax service.
Airbus offered the 275t MTOW as an option to all customers, but it was simply never taken up because like the A340-500 - it had very few practical uses. Although it should be noted that Airbus still offer a conversion program for existing -211/212 airframes to upgrade them to the -213 standard - and at least 2 of these conversions have been completed in the last few years.
Incidentally I doubt the A340-500 will have a seat/mile cost much lower than either the A340-200 or -300. Reason being that while the A340-500 carries a few more passengers (about 15 more I think in a typical config), it burns much more fuel, carries less freight and weighs a whopping 40,000kg more than an A340-300 when empty!
It's really only useful on ultra long range routes of greater than 7000nm, other than that the A340-300 makes much more economic sense IMO.
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