How Structured Outputs Actually Work: Grammar-Constrained Decoding and Logit Masking Under the Hood
When OpenAI launched response_format={"type": "json_schema", "strict": true} and open-source inference engines like vLLM, SGLang, and llama.cpp introduced grammar-constrained decoding, developer workflows changed overnight. Before this, getting an LLM to reliably return valid JSON required prayers,…
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- 2026-10-05 15:33 · DEV Community — Machine Learning
How Structured Outputs Actually Work: Grammar-Constrained Decoding and Logit Masking Under the Hood