LLM Output Control Library
13.7k 2026-04-18
dottxt-ai/outlines
Outlines guarantees structured outputs from Large Language Models during generation, eliminating post-processing headaches and ensuring data integrity.
Core Features
Guaranteed valid structured outputs (JSON, Pydantic, Literal)
Works with any model (OpenAI, Ollama, vLLM, HuggingFace Transformers)
Simple, Pythonic integration with type hints
Provider independence, switch models without changing code
Quick Start
pip install outlinesDetailed Introduction
Large Language Models (LLMs) are powerful, but their free-form text outputs can be unpredictable and challenging to integrate into structured workflows. Outlines solves this by enforcing strict output formats—such as JSON, XML, or custom Pydantic schemas—directly during the LLM's generation process. This approach eliminates the need for fragile post-generation parsing, ensuring that outputs are always valid and conform to predefined structures. It simplifies the development of reliable LLM-powered applications across various models and providers, making LLM outputs production-ready.