Instructor

Structured data extraction from LLMs via Pydantic models. Patches or wraps provider clients (OpenAI, Anthropic, Gemini, Cohere, Mistral, Groq, Ollama, and 15+ others) to add response_model, automatic validation, and retry logic. Uses tool-calling or JSON mode depending on provider. Core interface: client.chat.completions.create(response_model=MyModel, ...) returns a validated Pydantic instance. Maintained by Jason Liu / jxnl.