Does enforcing JSON make answers worse?

Six ways to wrap the same reply, nine models, five benchmarks. What does the JSON envelope really cost your answers?

September 13, 2026

llm structured-output benchmarking cominty

Originally published on cominty.ai Does enforcing JSON make answers worse? Read the original

Nigiva

Citation

@article{duchene2026doesenforcingjsonmakeanswersworse,
  title   = "Does enforcing JSON make answers worse?"
  author  = "Duchêne, Corentin"
  journal = "blog.nigiva.com"
  year    = "2026"
  url     = "https://blog.nigiva.com/2026/09/13/does-enforcing-json-make-answers-worse.html"
}