Haystack

Haystack is an open-source AI framework designed to build production-ready, LLM-powered agents and applications. Its modular architecture provides full visibility to inspect, debug, and optimize every decision made by the AI. It allows integration with various AI stacks like OpenAI, Anthropic, Mistral, Hugging Face, Weaviate, Pinecone, and Elasticsearch. Haystack enables users to move from prototype to production using composable building blocks, with unified tooling for building, testing, and shipping AI use cases. Pipelines are serializable, cloud-agnostic, and Kubernetes-ready. It supports advanced RAG pipelines, agentic workflows, multimodal AI applications, conversational AI, and content generation.