Expired50% confidenceFactExact time
OpenAI provides the strict:true and response_format:json_schema parameters, which can mathematically guarantee that the model does not output intent results outside the enumerated values.
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
7/2/2026
First Seen
Valid until: 9/30/2026(expired)
Sources
Related Claims
VerifiedOpenAI's Structured Output is based on Constrained Sampling technology, which allows only tokens conforming to the current JSON Schema constraints to be sampled at each decoding step, thereby mathematically guaranteeing the validity of the output format.79% similarUnverifiedOpenAI's function calling/tool use mechanism is a hard constraint; the model inference engine directly constrains the valid set of output tokens during the decoding phase, thereby guaranteeing format compliance at the protocol level.77% similarUnverifiedOpenAI offers Codex models with different parameter scales and capability tiers, where lightweight models are suitable for simple code completion and formatting tasks, and high-parameter models perform better in complex logical reasoning, multi-file refactoring, and architecture design.76% similarUnverifiedMainstream APIs from OpenAI, Anthropic, and others provide a strict mode which, when enabled, allows tool-call parameters to precisely match the Schema.75% similarUnverifiedStructured Output requires the schema to be passed to the API in advance and is only effective for OpenAI's own models74% similar
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