litellm

The fastest, litest AI Gateway. Rust core with Python SDK. Call 100+ LLM APIs in OpenAI (or native) format with cost tracking, guardrails, load balancing, and logging [Bedrock, Azure, OpenAI, Anthropic, OpenAI, VertexAI, vLLM, Nvidia NIM]. Maintained by BerriAI on GitHub, where it has earned 55,577 stars from the community.

It's actively developed around anthropic, langchain, llm, and is a solid reference for anyone building with these tools.