Domain-specific language and toolchain for type-safe LLM functions, structured outputs, and multi-provider orchestration.
At a Glance
Pricing
Get started with BAML at no cost with CLI & editor extensions and Unlimited BAML schemas.
Engagement
Available On
Updated Feb 2026
About BAML
BAML (by Boundary) is a domain-specific language and toolchain for building reliable, type-safe LLM workflows. You define functions, types, and clients in .baml files, then BAML generates language clients (e.g., Python/TypeScript) that call providers like OpenAI or Anthropic and return validated, structured results. The VS Code/Cursor extension includes an integrated playground with prompt preview and raw cURL visibility. BAML supports streaming typed outputs, multimodal inputs (PDFs, images, audio, video—depending on provider), checks/asserts for validation, dynamic types via a TypeBuilder, and a Collector for usage and raw response inspection. You can also expose functions as REST endpoints with an OpenAPI spec and generate clients for other languages.
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Pricing
Free Plan Available
Get started with BAML at no cost with CLI & editor extensions and Unlimited BAML schemas.
- CLI & editor extensions
- Unlimited BAML schemas
- TypeScript generation
- Basic schema validation
- Local development
14 days
Try BAML for 14 days with access to Free trial available.
- Free trial available
Team
Designed for teams with Advanced type generation and Runtime validation and collaboration features.
- Advanced type generation
- Runtime validation
- Unlimited schemas
- Team collaboration
- Private schemas
- Custom transformations
- Priority support
- Annual billing available (save 20%)
Enterprise
Enterprise-grade solution with On-premise deployment and SSO & SAML and dedicated support.
- On-premise deployment
- SSO & SAML
- Custom rate limits
- Audit logs & compliance
- 99.9% uptime SLA
- Dedicated account manager
- Custom training & onboarding
- Contact sales
Capabilities
Key Features
- Define LLM functions with typed inputs/outputs and generate language clients from `.baml` files.
- VS Code/Cursor playground with prompt preview and raw cURL request view.
- Provider-agnostic client config; switch providers/models at runtime.
- Streaming structured outputs with type guarantees, including partial field updates.
- Expose functions as REST endpoints and auto-generate OpenAPI client SDKs.
- Dynamic types at runtime using TypeBuilder for classes/enums.
- Checks and asserts to validate values and enforce constraints.
- Collector API for token usage, timings, and raw LLM responses.
- Multimodal inputs (PDF, image, audio, video) where supported by providers.
- Concurrency, retries, error handling, and abort/timeout controls.
Integrations
Demo Video
