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Glossary · Intermediate · 2024

Structured Output

A feature that makes the model's output conform exactly to a predefined schema.

EN — English term
Structured Output
TR — Turkish term
Yapılandırılmış Çıktı

Structured output is the API feature that guarantees a model's response not only is valid JSON but conforms to a developer-supplied schema — JSON Schema or Pydantic — exactly. OpenAI launched "Structured Outputs" in August 2024, Anthropic enforced schemas via tool use for Claude, and Google offered "controlled generation" for Gemini. Unlike JSON Mode, it guarantees key names, types, and even enum values. In production agent systems it's a cornerstone of reliable output, used together with Tool Definition Schema and Function Calling.