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Instructor

Stop prompting, start typing Python

Free
Categories: Developer Tools
Instructor is the most popular Python library for getting structured outputs from LLMs using Pydantic models. It handles retries, validation, and streaming, working with OpenAI, Anthropic, Google, and 20+ providers. Used by thousands of developers to build reliable LLM applications.

Key Features

  • Pydantic-based output validation
  • Automatic retry on validation failure
  • 20+ LLM provider support
  • Streaming structured outputs
  • Type-safe LLM responses
  • Open-source Python library

Use Cases

  • Extracting structured data from LLMs
  • Building reliable AI pipelines
  • Type-safe LLM application development
  • Data extraction and classification
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