100cc - Roll your own Claude in 100 lines

In plain words

100cc is a tool that lets users create their own customized version of Claude, an AI assistant, using just 100 lines of code. Available on GitHub, it's designed for developers and programmers interested in experimenting with AI model customization and configuration. The project stands out for its simplicity and minimal code requirement, making AI personalization accessible to those without extensive machine learning expertise.

written from the facts on this page · September 2026

From the sources

The idea is simple. Write the bare minimal harness by hand and then ask it to write itself. OPENAI_API_KEY=... # required OPENAI_MODEL=... # required OPENAI_BASE_URL=... # optional, defaults to OpenAI's official endpoint Run It starts with the bare minimal. Only non-interactive mode( -p ) is implemented bun start -- -p " review this project and add 3 jokes to README.md " Ask it to writefrom github.com

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