Yeah, but they don’t do a semantic correction. LLM are extraordinarily more powerful than HMM.
An LLM is useless (or not as useful) in OCR for forms where we are trying to extract the name "John Smith" from a name field whereas a HMM trained specifically on name fields may be able to do a better job.
LLMs may perform better as a post processing step for running text (such as book pages).