OpenRouter is a unified API gateway that provides access to over 300 AI models from 60+ providers -- including Anthropic, OpenAI, Google, Meta, Mistral, and more -- through a single OpenAI-compatible API. Instead of managing separate API keys, billing accounts, and integrations for each AI provider, developers connect to one endpoint and get instant access to hundreds of models. OpenRouter features intelligent routing that automatically selects the best provider based on cost, latency, and availability. If a provider goes down, the platform automatically fails over to an alternative, ensuring high availability. The platform serves over 5 million users globally and powers 250,000+ applications. With its pay-as-you-go credit system, there are no subscriptions or lock-ins required. OpenRouter also offers 25+ free models for experimentation, making it accessible for developers at any scale. Key differentiators include provider-transparent pricing with no markup on model costs, customizable data policies for enterprise compliance, and edge-deployed infrastructure for minimal latency worldwide.