Unverified50% confidenceSolutionExact time
Developers 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.
1
Sources
50%
Confidence
Long-term
Relevance
9/25/2026
First Seen
Sources
Related Entities
Related Claims
UnverifiedJSON 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.77% similarUnverifiedConstrained decoding restricts the model, via a predefined JSON Schema, so that each generated token can only be selected from the set of valid tokens.76% similarUnverifiedStructured output constrains format via JSON Schema, which can eliminate randomness at the format level and confine uncertainty to the scope of semantic content.74% similarUnverified在FastMCP中，函数的类型提示和文档字符串会自动转换为符合JSON Schema规范的工具模式，无需手写JSON Schema73% similarUnverifiedThe Prompt API uses JSON Schema's enum constraint on the tags field in conjunction with structured output to ensure that model output can only come from a predefined set of valid tags.73% similar
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