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Oh OpenAI finally offered constrained generation e.g. supply the regex the output should match (something llama.cpp had). I get much better results for coding LLM if the output is XML, so now I can have a custom too output valid XML trivially.
<https://cookbook.openai.com/examples/gpt-5/gpt-5_new_params_and_tools#3-contextfree-grammar-cfg>

this is really great actually, you don't need to even explain what the output format should be, it is railroaded into producing conforming output

In my experience, you do get much better output if you  *do* though.