# Instructor

Instructor is the most popular Python library for extracting structured data from LLMs using Pydantic validation, making it effortless to get reliably formatted outputs from any language model. Instead of parsing inconsistent LLM text output, Instructor automatically retries with validation feedback until the model produces data matching your exact schema. Supporting all major LLM providers, Instructor handles complex nested structures, lists, enums, and custom validators, making it the go-to tool for production applications that need to extract structured information reliably.

## Quick facts

- Categories: Developer Tools
- Pricing: Free
- Free plan: Yes
- Official site: https://python.useinstructor.com
- Last checked: 2026-10-23

## Key features

- Pydantic schema validation
- Automatic retry on failure
- All major LLM provider support
- Complex nested structure support
- Zero-shot structured extraction

## Use cases

- Structured data extraction from text
- Building reliable AI pipelines
- API response structured parsing
- Production AI data processing

## Links

- Nextool.ai page: https://nextool.ai/tools/instructor-python/
- Alternatives: https://nextool.ai/alternatives/instructor-python/

Source: Nextool.ai (https://nextool.ai/tools/instructor-python/). Pricing and features change; confirm on the provider's site before relying on them.