LiteLLM

Open source AI gateway

LiteLLM is the most widely used AI gateway, trusted by companies including Adobe, Netflix and NASA. It gives developers secure, reliable access to large language models and adjacent services through a single interface — which matters because organisations running multiple models across multiple providers otherwise duplicate authentication, rate limiting, spend tracking and failover for each one. Being open source is central to its adoption, since the gateway sits directly in the path of every model call and teams want to see what it does.