RouterBase is a unified API gateway that provides access to 200+ AI models including GPT, Claude, Gemini, Llama, Mistral and DeepSeek through a single OpenAI-compatible endpoint. It works as a drop-in replacement for the OpenAI SDK, with smart routing by cost or latency, automatic failover during outages, unified billing and usage analytics. SDKs are available for Python, Node.js, Go and Ruby. A free tier is available to get started.