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Instructor

Structured outputs from LLMs with Pydantic

4.7(202 reviews)free
free tieropen sourceapi access

Python library for getting structured Pydantic objects from LLM outputs reliably, with automatic retry and validation.

Pros

  • Pydantic-native structured outputs
  • Automatic retry on failure
  • Multi-LLM support

Cons

  • Python only
  • Developer library only

Best For

Python developers extracting reliable structured data from LLM responses

Pricing

Free Forever

Free
  • Core features
  • Email support

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