Structured Outputs

Learn to implement structured outputs with Anthropic's SDK. Explore 10 examples, from basic JSON schema requests to advanced parsing techniques.

Understand how output_config.format guarantees schema-valid responses directly from the Claude API, instead of relying on prompt instructions that ask the model to "please return JSON."

Write a JSON Schema with required fields and additionalProperties set to false so output_config.format returns exactly the shape your code expects.

Parse and validate a schema-constrained response using Pydantic models automatically with client.messages.parse.

Reference table for supported types, enums, string formats, and unsupported schema constraints when designing a schema for output_config.format.

Numbered best practices for designing schemas, validating responses, and handling malformed or truncated structured output.

A single-page roundup of every highlight bullet from the 9 pages in the Structured Outputs section, grouped by source page so you can scan all 32 takeaways without opening each article individually.