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LMQL

LLM Orchestrators

Overview

A declarative programming language for Large Language Models. It combines the power of natural language prompting with the precision of Python-like control flow, allowing for constrained generation and efficient token usage.

LMQL is a declarative query language for LLMs that blends natural-language prompting with Python-like control flow and constraints, enabling efficient, constrained generation. It lets you express what valid output looks like and let the runtime enforce it. It targets developers who want high-level, reliable LLM programming.

Key Features

  • Declarative LLM query language
  • Constrained generation
  • Python-like control flow
  • Token-efficient execution
  • Open-source

Best For

Developers who want a high-level, constraint-driven way to program LLMs.

Pros & Cons

Pros
  • Expressive constraints
  • Efficient token usage
  • Open-source
Cons
  • Learning a new language
  • Smaller ecosystem
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Pulse Verdict

The SQL for LLMs. LMQL provides the high-level abstractions and constraints needed to build reliable, high-performance AI applications without the usual token waste.

Pricing

Open-source and free; you supply the model.

Pricing changes often — confirm current plans on the official site.

Visit Official Website →

Related Tools

Outlines

A Python library for structured text generation. It allows developers to guide LLM sampling with regular expressions, JSON schemas, or context-free grammars to ensure predictable, machine-readable output.

Guidance

A programming framework by Microsoft that allows developers to control LLMs more effectively than traditional prompting. It uses a templating language to interleave generation, prompting, and control logic.