Unverified70% confidenceCautionExact time
FSM constraints can guarantee JSON format validity at the grammatical level, but cannot constrain the semantic quality of fields.
2
Sources
70%
Confidence
Long-term
Relevance
7/20/2026
First Seen
Sources
Related Claims
VerifiedJSON 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.82% 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.75% similarUnverifiedJSON语法规范要求属性名必须用双引号包裹，末尾不允许出现多余逗号，不支持注释语法72% similarUnverifiedJSON Schema annotation keywords such as title, description, and examples do not affect validation logic, but large models rely on these annotations to understand parameter meanings72% similar
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