Using OpenRouter With LangChain: ChatOpenRouter Setup Guide

OpenRouter is designed to integrate with LangChain applications, allowing users to incorporate over 400 models from 70+ providers without rebuilding their existing setups. The integration is facilitated through a dedicated package, langchain-openrouter on PyPI and @langchain/openrouter on npm, which simplifies the process by handling provider load balancing, outage avoidance, and cross-provider failover automatically. Users can set up OpenRouter in their LangChain app in three steps: installing the package, authenticating with an API key, and invoking the model. OpenRouter supports streaming responses, tool calling, and structured output, with options for provider routing and fallbacks to ensure resilience. The system also offers features like reasoning, multimodal inputs, caching, and observability, which can be incorporated through constructor or request parameters. While the integration is in beta and requires a current LangChain version, it provides a streamlined approach to using OpenRouter's extensive model catalog within LangChain's orchestration framework.

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