Instructor
Structured outputs from LLMs using Pydantic schemas
Verdict
Cleanest way to get typed, validated structured output from any LLM. Built on Pydantic. Automatic retries on validation failure. Should be in every production RAG stack.
Other Frameworks & SDKs
- DSPyStable
Stanford framework for programming (not prompting) LMs
- GuidanceExperimental
Microsoft's constrained generation library for structured LLM output
- HaystackStable
Deepset open-source NLP framework for production LLM pipelines
- LMQLExperimental
Query language for LLMs — SQL-like syntax for constrained generation
- LangChainProduction
Composable LLM application framework — chains, agents, RAG
- LlamaIndexProduction
Data framework for LLM applications — indexing and retrieval