Open-source LLM framework to build production-ready applications

Use the latest LLMs: hosted models by OpenAI or Cohere, open-source LLMs, or other pre-trained models
All tooling in one place: preprocessing, pipelines, agents & tools, prompts, evaluation and finetuning
Choose your favorite database: Elasticsearch, OpenSearch, Weaviate, Pinecone, Qdrant, Milvus and more
Scale to millions of documents: use Haystack's proven retrieval architecture

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Enabling Semantic Search

Question Answering

Ask questions in natural language and find granular answers in your documents using the latest QA models with the help of Haystack pipelines.

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Document Search

Perform semantic search and retrieve ranked documents according to meaning, not just keywords!

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Latest Models

Make use of and compare latest pre-trained transformer based language models like OpenAI’s GPT-3, BERT, RoBERTa, DPR and more.

Explore Docs

Latest Models

Pick any Transformer model from Hugging Face's Model Hub, experiment, find the one that works.

Flexible Document Store

Use Haystack NLP components on top of Elasticsearch, OpenSearch, or plain SQL.

Vector Databases

Boost search performance with Pinecone, Milvus, FAISS, or Weaviate vector databases, and dense passage retrieval.

Scalable

Build semantic search and question answering applications that can scale to millions of documents.

End-to-end

Building blocks for the entire product development cycle such as file converters, indexing functions, models, labeling tools, domain adaptation modules, and REST API.