AITowards Data Scienceabout 2 hours ago
Valid JSON Can Still Be Wrong Data
1 min read
Constrained decoding guarantees schema-valid JSON but BAML benchmarks show it scores 91.37% accuracy versus 93.63% for unconstrained generation with post-hoc parsing. Five failure modes produce structurally valid but substantively wrong output, including cross-field contradictions and array hallucination. Schema validation checks types, not correctness.
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