Is the new gx cassette xt-1150 compatible with the older sram 11 speed stuff xo11 x11, likewise what’s the cheapest 11 speed chain option to run with the xo11 set up?

The cassette looks a good option at £85 as a replacement.

Cheers.

Pretty much all 11spd is compatible with each other, even cross platform it seems (aside from shifters need to be paired to mechs from the same brand).

Cheapest chain last time I checked was SRAM PC1130’s, which are less than £20 RRP, so probably under £15 each online.