What Constrained Decoding Does That Prompting Never Can
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Last Updated on October 6, 2026 by Editorial Team Author(s): “The AI Engineer” Originally published on Towards AI. Subtitle You asked the model for JSON. You wrote “return valid JSON only” in capital letters. You added an example. You added a second example. For 99 calls out of 100, it worked. image generated by GEMINIAfter the lead, the article explains the difference between prompting and constrained decoding: prompts shift probabilities via context but cannot force invalid tokens to zero, whi
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