Outlines

Guaranteed structured text generation from LLMs

Code & DevelopmentFree

Outlines is a Python library for reliable, structured text generation from language models. Using logit bias and finite state machines, it guarantees that model outputs conform to a JSON schema, regex, or grammar — with zero retry overhead. AI engineers use Outlines to build robust data extraction pipelines and tool-calling systems.

Key Features

• ✓Schema-constrained generation
• ✓Regex and grammar constraints
• ✓Zero retry overhead
• ✓Local and API model support
• ✓Open-source