AWS OpenSearch Service delivers cloud-hosted vector operations with k-NN search powered by HNSW, Faiss, and Lucene, featuring auto-scaling clusters and GPU support via EC2 integration. Ideal for enterprise RAG pipelines and global search, it seamlessly integrates with AWS services like S3, Lambda, and SageMaker. Compared to Pinecone, offers hybrid search and lower costs; outperforms Zilliz Cloud in managed OpenSearch scalability.
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AWS OpenSearch Service provides k-nearest neighbor (k-NN) search capabilities for finding nearest neighbors in vector space by Euclidean distance or cosine similarity. Powered by NMSLIB, Faiss, and Lucene ANN libraries.
Create index with index.knn setting:
{
"settings": {
"index.knn": true
},
"mappings": {
"properties": {
"vector_field": {
"type": "knn_vector",
"dimension": 768
}
}
}
}
{
"query": {
"knn": {
"vector_field": {
"vector": [0.1, 0.2, ...],
"k": 10
}
}
}
}
Commercial managed service with usage-based pricing:
Detailed pricing: aws.amazon.com/opensearch-service/pricing/