litellm's routing + translation in ~2,900 lines and 2 dependencies ( openai , httpx ). litellm routes LLM calls across providers and translates between message formats. That core is buried under 100k+ LOC of proxy servers, caching layers, cost tracking, and dozens of features most users never touch. litelm extracts just the call path — model routing, message translation, streaming, tool use, embeddings — and nothing else. No Router class, no proxy, no caching. Install pip install litelm # openai + httpx pip install litelm[anthropic] # + anthropic SDK pip install litelm[bedrock] # + boto3 pip install litelm[all] # everything Usage import litelm # Basic completion response = litelm . completion ( "openai/gpt-4o" , messages = [{ "role" : "user" , "content" : "Hello!" }]) print ( response . choices [ 0 ]. message . content ) # Streaming for chunk in litelm . completion ( "groq/llama-3.1-70b-versatile" , messages = [...], stream = True ): print ( chunk . choices [ 0 ]. delta .…