UnoRouter is an AI API gateway that gives developers a single API key for 315+ AI models from 47+ providers, including OpenAI, Anthropic, Google, Meta, Mistral and DeepSeek. Instead of maintaining a separate integration, key and billing relationship for every vendor, teams point one OpenAI-compatible endpoint at UnoRouter and switch models by changing a string. Smart routing selects a healthy provider per request and automatic failover retries elsewhere when one degrades or rate-limits, so applications stay up when an upstream vendor does not. Because the API mirrors the OpenAI specification, existing tooling works without code changes: coding agents such as Cline and OpenCode, chat clients, CLI wrappers and any SDK already targeting OpenAI. A browser-based chat client with free models needs no signup or key, so teams can evaluate model quality before wiring anything into production. Usage is pay as you go, with per-request logging and spend visibility across every provider in one dashboard.