Haystack by Deepset

Haystack is an open-source AI framework developed by deepset that enables developers to build production-ready Retrieval-Augmented Generation (RAG), semantic search, question answering, document intelligence, and AI agent applications. Designed for AI engineers, software developers, machine learning teams, enterprises, and research organizations, the framework provides modular building blocks for creating intelligent applications powered by large language models (LLMs). By combining document retrieval, vector search, embedding models, pipelines, and AI orchestration, Haystack simplifies the development of scalable AI systems that deliver accurate, context-aware responses from enterprise data.

The framework allows developers to ingest, preprocess, index, retrieve, and generate responses from structured and unstructured data sources. Haystack supports document processing, semantic search, hybrid retrieval, vector databases, prompt orchestration, AI agents, document ranking, and customizable pipelines that can be adapted to a wide range of AI use cases. Developers can integrate leading LLM providers, embedding models, rerankers, and vector databases while maintaining complete flexibility over deployment and infrastructure. Its modular architecture enables rapid experimentation and production deployment without locking users into a specific AI provider.

Haystack integrates seamlessly with OpenAI, Anthropic, Google Gemini, Hugging Face, Cohere, Pinecone, Weaviate, Qdrant, Milvus, Chroma, Elasticsearch, PostgreSQL, Langfuse, and many other AI and data platforms. It supports AI agents, RAG pipelines, document indexing, evaluation, workflow orchestration, API development, and enterprise deployment. Its open-source ecosystem, extensive integrations, and production-ready components make Haystack one of the leading frameworks for developing enterprise AI applications and knowledge-based systems.

Haystack helps organizations accelerate the development of intelligent AI solutions while maintaining full control over data, infrastructure, and model selection. Whether building enterprise search engines, AI copilots, document assistants, customer support systems, legal research platforms, healthcare knowledge bases, or internal business applications, Haystack provides a flexible and scalable foundation for modern AI development. The best part? Haystack is completely open source and free to use, while deepset also offers commercial cloud services and enterprise solutions for organizations requiring managed infrastructure, advanced tooling, and enterprise support.