I built my own CLI coding agent around DeepSeek's prefix caching — a full repo analysis costs me ~$0.03

I've spent the last few months building flair , a personal CLI agentic assistant (coding + general computer tasks), designed from day one around DeepSeek — partly because I wanted an agent I fully understand down to the last line, partly because the economics are absurd in a good way. Repo: github.com/NAST0R/flair (MIT, Python, no heavy dependencies) Some numbers from real sessions, running it on its own codebase (~7k LOC plus a 2.6k-line test suite): A full "read everything and analyze the project"