llm_cassette

https://github.com/jibranusman95/llm_cassette

VCR for LLMs. Hooks into Faraday (used by ruby_llm, llm.rb, and most OpenAI/Anthropic clients), records SSE chunks with timing, and replays them correctly. Exact-match cassettes, RSpec helpers, token usage stored per interaction. Works with OpenAI and Anthropic out of the box.