Relatedly:

Llama: Add grammar-based sampling - https://news.ycombinator.com/item?id=36819906 (105 comments)

ReLLM: Exact Structure for Large Language Model Completions - https://news.ycombinator.com/item?id=35829399 (13 comments)

Show HN: Structured output from LLMs without reprompting - https://news.ycombinator.com/item?id=36750083 (54 comments)

Show HN: LLMs can generate valid JSON 100% of the time - https://news.ycombinator.com/item?id=37125118 (303 comments)

A guidance language for controlling LLMs - https://news.ycombinator.com/item?id=35963936 (190 comments)

LMQL: A query language for programming (large) language models - https://news.ycombinator.com/item?id=35956484 (12 comments)