Vespa
Open-source search and serving engine combining vector search, keyword search, and ML ranking at scale
Vespa is an open-source platform originally developed at Yahoo that combines big data serving, vector search, keyword search, and machine-learned ranking in a single engine. It handles hybrid search (BM25 + semantic vectors), tensor operations, multi-phase ranking, and real-time data updates across billions of documents with sub-100ms latency. Vespa Cloud offers managed hosting with usage-based pricing, autoscaling, and a free trial with $300 in credits. Also available on AWS and GCP Marketplace.
Pricing: Usage-based
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