UnoRouter is an OpenAI-compatible API gateway that puts 311+ AI models behind a single key and a single endpoint. Point any existing OpenAI SDK at it by changing one base URL, and you get access to models from OpenAI, Anthropic, Google, DeepSeek, Qwen, Mistral and more without managing a separate account, billing relationship or SDK for each provider.

Why it exists: switching models normally means rewriting integration code. UnoRouter keeps the request and response shape identical across every provider, so trying a new model is a one-line change rather than a refactor. Automatic failover routes around provider outages, and per-request logging shows exactly what each call cost.

Built for developers who want to compare models on real workloads instead of benchmarks. There is a free tier with genuinely free models, pay-as-you-go pricing with no subscription, and a built-in chat interface for testing prompts before wiring them into code.