Unverified50% confidenceFactExact time
约束解码是一种在LLM推理阶段强制输出符合特定语法或模式的技术，典型实现包括OpenAI的JSON Mode、Outlines库和LMQL
1
Sources
50%
Confidence
Long-term
Relevance
8/24/2026
First Seen
Sources
Related Entities
Related Claims
VerifiedOpenAI's JSON Mode and Structured Outputs constrain output at the API level.75% similarUnverifiedJSON 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.73% similarUnverifiedOutlines supports multiple-choice constraints, type constraints, regular expression constraints, JSON Schema/Pydantic model constraints, and Context-Free Grammar (CFG) constraints.73% similarPartially 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.72% similarUnverifiedOutlines库的核心技术是基于正则表达式的Token掩码，将JSON schema转换为正则表达式再预编译为有限状态自动机71% similar
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