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AI Infrastructure & MLOps Free

BAML

Open-source programming language for reliable structured outputs from LLMs

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PricingFree
Starting price$0
Free planYes
Free trialYes
APIYes
Open sourceYes
DeploymentSelf Hosted
Last verifiedAugust 3, 2026
Overview

Tool overview

BAML is listed under AI Infrastructure & MLOps AI tools.

Summary

What is BAML?

BAML is an open-source domain-specific programming language and toolchain for defining LLM functions, prompts, schemas, tests, and typed clients. It runs locally, works with major model providers, integrates with multiple programming languages, and can expose generated functions through REST and OpenAPI clients.

Best fit

Best for

Software teams building typed and testable LLM application functions

Audience

Who is it for?

AI application engineersBackend developersPlatform teamsLLM evaluation teams
Recommendation

Decision note

Accepted for Preview after independent V411 official-source research. Apply only after failures = 0, warnings = 0, unmapped = 0, and review of controlled fields, Arabic v2 parity, outreach, affiliate status, logo QA, rebrand handling, and explicit clears.

Capabilities

Key features

Typed LLM functions and schemas

Prompt preview, tests, and IDE tooling

Generated clients for multiple languages

Local REST server and OpenAPI support

Workflows

Use cases

Generating reliable structured LLM output

Building typed AI application functions

Switching between model providers

Serving BAML functions to other languages

Strengths

Pros

  • Free and Apache-2.0 licensed
  • Runs entirely on the users machine
  • Broad language and model support
Considerations

Limitations

BAML improves structure and developer ergonomics but does not guarantee factual accuracy or application safety. Teams must evaluate prompts and models, secure provider credentials, handle retries and moderation, test generated clients, and operate production infrastructure.

Cost

Pricing details

Pricing modelFree
Starting price$0
Free planYes
Free trialYes
Pricing context

Billing options

Free open-source software

Pricing context

Pricing note

The official pricing page states that BAML is free and open source and runs entirely on the users machine without calling Boundary servers. A future cloud product for observability, team controls, and governance is announced but not yet priced.

View official pricing
Compatibility

Supported languages

  • English
Connectivity

Integrations

Python

TypeScript

Ruby

Java

Go

C#

Rust

OpenAPI

Specs

Technical details

PlatformsAPI
Multilingual supportUnknown
Login requiredNo
Open sourceYes
LicenseApache-2.0
DeploymentSelf Hosted
CompanyBoundaryML, Inc.
Models / versionsOpenAI Anthropic Google Azure OpenAI AWS Bedrock OpenRouter Ollama
Editions / plansOpen-source BAML Future Boundary Cloud
Data confidenceHigh
Last verifiedAugust 3, 2026
Documentation → Source code → Release notes → Data source →
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Answers

Frequently asked questions

BAML is an open-source domain-specific programming language and toolchain for defining LLM functions, prompts, schemas, tests, and typed clients. It runs locally, works with major model providers, integrates with multiple programming languages, and can expose generated functions through REST and OpenAPI clients.
Software teams building typed and testable LLM application functions
The listed pricing model for BAML is free. Pricing can change, so users should verify the latest plan details on the official website.
Yes. The current profile indicates that a free trial is available.
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