ZeroEntropy (YC W25)

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ZeroEntropy delivers state-of-the-art rerankers and embeddings for your retrieval stack—or use our end-to-end search engine, from raw documents to top results. Our models are open-weight, and state-of-the-art, you can read a full benchmark in our blog. ZeroEntropy is built with enterprise-grade security at its core. From SOC 2 Type II compliance to HIPAA readiness, we protect your data with the highest standards — so you can focus on building, not worrying. Companies in the Customer Support space like MyAskAI have seen significant latency and accuracy improvements when switching to ZeroEntropy's reranker. Companies in the legal industry rely on ZeroEntropy's search API and reranker to provide very accurate responses in high stakes use cases like contract understanding or legal research. Vera Health uses ZeroEntropy for both simple retrieval across millions of medical research papers, but also for Deep Research use cases using our MCP server. Leaping AI and other Voice AI companies trust ZeroEntropy in production to connect their agents to large knowledge bases for hundreds of thousands of calls every day.