Verified65% confidenceFactExact time
JSON Mode only guarantees that the output is valid JSON without constraining the field structure; Structured Outputs enforces output conforming to a predefined JSON Schema at the syntactic level by applying a finite state machine (FSM) to constrain the token sampling path during the decoding phase.
3
Sources
65%
Confidence
Long-term
Relevance
7/22/2026
First Seen
Sources
Related Claims
VerifiedStructured output imposes constraints on token generation during the decoding phase through JSON Schema or function-calling mechanisms, which is fundamentally different from requesting JSON-format output in the prompt.83% similarUnverifiedFSM constraints can guarantee JSON format validity at the grammatical level, but cannot constrain the semantic quality of fields.82% similarUnverifiedDevelopers can use system prompts or JSON Schema to force the model to return only enumerated values from predefined fields, disallowing free-text output containing value judgments.77% similarUnverifiedOpenAI's Structured Outputs mode enforces JSON Schema-compliant output at the token sampling level through constrained decoding technology, completely eliminating formatting errors, a hard constraint that ordinary Function Calling does not possess.77% similarUnverifiedJSON mode and structured output only solve the problem of format validity; they do not guarantee semantic correctness and do not provide calibrated confidence, so they cannot support threshold policies.77% similar
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