Voyage AI builds embedding and reranking models used as the retrieval layer in RAG pipelines, sold as a hosted API and, since February 2025, owned by MongoDB. The acquisition folded Voyage's models in
Cohere Rerank is a hosted cross-encoder scoring service that sits after a first-stage retriever in a RAG pipeline. It takes a query and a list of candidate documents pulled from a vector store, BM25 i
Microsoft GraphRAG is an open-source, MIT-licensed indexing and query framework that builds a knowledge graph from a document corpus and layers structured retrieval on top of it, rather than relying s
