me too. used codex to convert a bunch of riggings between lots of models via blender api.

it felt weak at it , like the corpus wasn't strong with blender/python work to look through , but it got going at it fairly fast with some coaxing.

What model you using? With codex and gpt-5.4 set to xhigh (and now gpt-5.5) seems to have zero issues helping me with rigging and fixing glb/fbx models, works as a charm. One time I instructed it to iterate together with screenshots because it was a gnarly task, but usually it figures out everything even when headless.