Structured Output & Typing

For when you need the model to return data, not prose. These libraries enforce a schema and hand you validated, typed objects — so an LLM call slots straight into typed code.

instructor

567 Labs

Structured, validated outputs from any LLM — define a Pydantic model and get a typed object back.

v1.17.02026-09-09PythonMIT

#structured-output #pydantic #validation #python

13.9k Completely free Open source

Pydantic AI

Pydantic

Type-safe agent framework from the Pydantic team — structured, validated results with any model

v2.47.02026-09-22PythonMIT

#agents #structured-output #pydantic #python

20.1k Completely free Open source