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Models
JSON mode / Structured output
A constrained decoding mode where the model is forced to produce valid JSON matching a schema.
Structured output (JSON mode in OpenAI, tool use in Claude, controlled generation in Gemini) constrains the model to return JSON matching a schema you provide. This eliminates the parse-the-output reliability problem that plagues early LLM applications. Always use structured output when the downstream consumer is code, not a human.
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Building with JSON mode / Structured output?
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