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What is the serving overhead of structured (JSON/grammar-constrained) output, and how do you cut it?

Forcing valid JSON sounds free, but the mask computation can stall every decode step. The fix is precompiling the grammar into a fast automaton. Here is where the cost hides and how to remove it.

Updated Aug 2026 · Grounded in real Applied AI Engineer interview loops and written to a senior-engineer editorial bar.

Forcing valid JSON sounds free, but the mask computation can stall every decode step. The fix is precompiling the grammar into a fast automaton. Here is where the cost hides and how to remove it.

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