Haystack
Free tierThe open-source AI framework for production-ready agents, RAG & context engineering
Key strengths
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Recent changes
- Plans updated: Open-source framework is free; Enterprise support and platform available with flexible pricing based on company size.
- Models updated: Multiple (OpenAI, Anthropic, Mistral, Hugging Face, and more)
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Haystack is an open-source AI orchestration framework (Apache 2.0) designed for building production-grade LLM applications, RAG pipelines, and AI agents. Its core architecture is built around a modular, composable pipeline model — developers assemble discrete, reusable components (retrievers, readers, generators, routers, etc.) into directed pipelines using a declarative graph structure. This design enforces clean separation of concerns and makes pipelines easy to test, extend, and swap out.
Key technical characteristics:
- Multi-provider model support: Integrates natively with OpenAI, Anthropic, Mistral, Hugging Face, and more — no vendor lock-in by design.
- Vector store integrations: First-class support for Weaviate, Pinecone, and Elasticsearch, among others.
- Self-hostable: Full control over deployment; supports Kubernetes for scalable, production-ready infrastructure.
- Observability: Built with production operability in mind, including support for monitoring and tracing.
- Open-source core: 26,800+ GitHub stars; free to use under Apache 2.0. Enterprise support and a managed platform are available with flexible pricing.
- Founded: 2019, headquartered in Germany.