The big caveat here is that the inner monologue papers generally work with GPT-3-175b, LaMDA, or Gopher, all of which are much bigger than 20b, and they generally show phase transitions (https://old.reddit.com/r/mlscaling/comments/sjzvl0/d_instanc...) in the monologue capability: below a critical size, inner monologue doesn't work at all, performing worse than baseline even, no matter how they scale, and only past the critical size does inner monologue suddenly start working much better. So it's possible (has anyone checked?) that GPT-NeoX-20b just isn't large enough to do inner monologue.