OpenRouter is a unified API gateway that gives dev
OpenRouter is a unified API gateway that gives developers and teams access to hundreds of AI models—from top providers like OpenAI, Anthropic, Google, Meta, Mistral, and more—via a single API key. It offers built-in model routing, high availability, transparent pay‑as‑you‑go pricing, automatic fallback, prompt caching, tool calling, and support for both chat and completion endpoints.