Simon Willison research-llm-apis: Curl-by-Curl HTTP API Documentation for Anthropic, OpenAI, Gemini, and Mistral
Simon Willison·low signal
Simon Willison published a research repository documenting the raw HTTP APIs of four major LLM providers with curl command examples and captured outputs for both streaming and non-streaming modes. The goal is to inform the design of a thin LLM abstraction layer by understanding exactly what each provider sends and receives at the HTTP level. Useful for anyone building multi-provider agent tooling or debugging API integration issues.