What problem does it solve?
Outlines removes the pain of getting unreliable, malformed, or unvalidated model outputs by constraining generation to a precise structure so downstream code can trust the result.
Core Features & Use Cases
- Guaranteed structured output: Generate JSON/XML/typed objects that match a schema, including Pydantic models, without guesswork.
- Grammar-constrained decoding: Uses CFG/FSM-based token filtering to enforce valid formats at generation time.
- Local-first & high-performance backends: Works with Transformers, llama.cpp (GGUF), and vLLM for efficient on-device or high-throughput inference.
Example use case: Extract product details from free-form text into a Pydantic model (name, price, availability) while ensuring fields and constraints (like regexes, numeric ranges, and enum values) are satisfied.
Quick Start
Ask your AI to extract entities from a document and return the result as a validated Pydantic JSON object using Outlines structured generation.