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TypeChat

Microsoft library that builds natural-language interfaces by using your own types to define what a model must return.

Open source
Visit github.com TypeChat (official site)Compare developer platforms

What is TypeChat?

TypeChat is a library from Microsoft for creating natural-language interfaces to apps. The README explains that older approaches relied on complex decision trees to work out intent, and that language models make this easier but introduce new problems: constraining replies for safety, structuring responses for further processing and making sure they are valid. TypeChat addresses these by letting you describe the shape of acceptable responses with types, then checking what the model returns against them. The project is MIT licensed and aimed at developers who want users to speak or type requests that become structured actions in their software.

Use cases

  • Turn requests into typed actions
  • Build natural-language app interfaces
  • Validate model replies against types
  • Replace intent decision trees
  • Prototype conversational commands

Who it's for

  • TypeScript developers
  • App developers
  • AI engineers
  • Prototypers

Why use TypeChat

  • Types you already write become the contract with the model.
  • Validation helps keep replies safe for further processing.
  • Removes hand-built intent routing code.
  • Open license permits use in commercial apps.

TypeChat features

  • Types describe the allowed response shape
  • Validation of model replies
  • Library for natural-language interfaces
  • MIT license
  • Maintained under the Microsoft organization

How to get started with TypeChat

  1. Install the TypeChat package for your language from the repository instructions.
  2. Write types that describe the actions or data your app can accept.
  3. Connect a language model and pass the user's request through TypeChat.
  4. Use the validated, typed result to run the action in your app.

TypeChat limitations

  • Library for developers, not an end-user product
  • Depends on a language model service for the model itself

TypeChat pricing

TypeChat is open source, so you can use and self-host it for free.

Prices can change and may vary by country or exclude tax. Check the official pricing page.

TypeChat alternatives

The main TypeChat alternatives listed on Debuly are Instructor, BAML, Outlines, Marvin, Guidance and Galileo. The table compares pricing and platforms; order is A–Z.

TypeChat compared with its alternatives
ToolPricingStarting pricePlatforms
TypeChatOpen source——
BAMLOpen source—CLI, macOS, Linux, Windows
GalileoFreemium$100/moWeb, Self-hosted
GuidanceOpen source—API
InstructorOpen source—API, Self-hosted
MarvinOpen source—Python, CLI
OutlinesOpen source—API

  1. BAML

    Open-source, TypeScript-like programming language for agents, with typed LLM functions, built-in tests and SDK generation.

    Developer platformsCoding
    Open sourceVisit BAML (official site)

  2. Galileo

    AI observability and eval platform that tunes evals to your data and turns them into guardrails for LLM apps and agents.

    Developer platformsAutomation and agents
    FreemiumVisit Galileo (official site)

  3. Guidance

    Python library for steering language models, combining constrained generation with ordinary control flow so outputs follow regexes, grammars or JSON schemas.

    Developer platforms
    Open sourceVisit Guidance (official site)

  4. Instructor

    Open-source library that gets validated, typed structured data out of LLMs using Pydantic models and automatic retries.

    Developer platformsCoding
    Open sourceVisit Instructor (official site)

  5. Marvin

    Open source Python framework from Prefect for getting structured output from LLMs and building agent workflows from tasks and threads.

    Developer platformsCodingAutomation and agents
    Open sourceVisit Marvin (official site)

  6. Outlines

    Python library from .txt that makes LLM output match a type you define, such as a Pydantic model, enum or regex, during generation.

    Developer platformsCodingAutomation and agents
    Open sourceVisit Outlines (official site)

TypeChat FAQ

Is TypeChat free?

Yes, the repository is MIT licensed. Model usage is billed by whichever provider you connect.

What problem does TypeChat solve?

It helps constrain, structure and validate language model replies so apps can act on them reliably.

Who is TypeChat for?

Developers adding natural-language commands to their software.

What are alternatives to TypeChat?

Alternatives include Instructor, BAML, Outlines and Marvin.

Sources & verification

Facts on this page come from the official sources below, each with the date we read it. Written by Debuly; the vendor did not review this page.

SourceTypeAccessed
github.com/microsoft/TypeChatofficial

Image credits

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