The Sony WH-1000XM5 at $198 is the sensible upgrade from the Sony WH-1000XM4 in 2026. The XM6 costs $378; the Soundcore Space One is $99.99.
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Why Upgrade?
Headphones are worth replacing when something breaks or something better is cheap enough. Worn pads can be replaced for far less than a new pair, so start there if comfort is the only complaint. If the battery is fading or you want newer features, the options below are what is on sale at Amazon.com on 5 October 2026. Their feature claims are the makers'; I have not compared them to your XM4.
Bottom Line
Upgrade when it makes sense, not because a new model exists
If only the pads are worn, replace them. If you want a new pair, the XM5 at $198 is the sensible same-brand step, the Space One at $99.99 is the cheapest swap, and the XM6 at $378 is the premium option on Sony's claims. I have not tested any of these against an XM4.