If you're trying to include LLM-generated item responses in psychometric work, you should check out my mixedsubjectsirt package that's now available on CRAN! Importantly, this is a statistical and LLM-agnostic approach with strong efficiency guarantees (a thread). klintkanopka.com/mixedsubject...
Item Response Theory Calibration with a Mixed Subjects Design
Integrates large language model generated item responses into psychometric calibration studies through a mixed-subjects design for unidimensional two-parameter and one-parameter logistic item response...
klintkanopka.com