Developer Tools Freemium
LangSearch
API 4.3/5 Web
What is LangSearch?
Free Web Search API and Semantic Rerank API for LLM applications, delivering clean, accurate context from billions of web documents.
LangSearch provides a free Web Search API and Semantic Rerank API designed for LLM applications. It supports natural language search, hybrid keyword and vector searches, and uses a transformer-based reranker model for high accuracy. The API delivers clean, high-quality context from billions of web documents including news, images, and videos. It offers easy integration via official API, LLM tools like LangChain, and AI agent plugins.
Key Features
Natural language web search
Semantic reranking
Hybrid keyword and vector search
Transformer-based reranker model (80M params, 280M-560M performance)
Supports news, images, videos
Custom filtering conditions
LLM function call integration
AI agent plugin support
Official API with curl examples
LangChain integration
Use Cases
Developers building LLM-powered chatbots integrate LangSearch to fetch real-time web context, enabling accurate answers to user queries about current events.
AI agent creators use the semantic rerank API to improve retrieval quality in RAG pipelines, reducing hallucination and increasing response relevance.
Data scientists leverage the hybrid search to combine keyword and vector searches for domain-specific document retrieval, boosting precision in research applications.
Product teams building AI search tools embed LangSearch to provide natural language querying over billions of web pages, delivering summarized results with citations.
Content analysts use the API to automatically gather and summarize news articles on specific topics, cutting manual research time from hours to minutes.
Enterprise developers integrate LangSearch into custom workflows with custom filters, enabling secure and compliant web data access for internal AI applications.
web search APIrerank APILLMAI agentnatural language searchhybrid searchsemantic rerankerLangChainRAGAI chatbot
Alternatives
Opens in a new tab on LangSearch website.
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