What it means
A normal model answer is free text. With structured output, you give the model a schema, a description of the exact fields and types you need, and it returns data in that shape. Many providers now offer modes that constrain the model to the schema.
It is what makes AI suitable for data extraction and integrations, where a missing field or wrong format would break the next step.
Why it matters for a business
Business systems need predictable data. Structured output lets an AI read an invoice or email and hand clean fields to your accounting system or CRM, with code checking the result.
A business example
Things to watch
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Validate every response in code, even with schema modes.
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Allow empty values instead of forcing guesses.
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Keep schemas simple and well described.
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Log failures to improve prompts.