After being shocked by Fable 5's performance and price, someone built a stripped-down md for Claude, GPT, and Gemini using GPT-5.6.
3 files for Codex, OpenCode, Claude Code and Gemini CLI: k-fable-opus-claude-md AGENTS.md, k-fable-opus-claude-md CLAUDE.md, k-fable-opus-claude-md GEMINI.md — 10,000 tokens loaded in every session.
AGENTS.md A 3,353 tok CLAUDE.md A 3,295 tok GEMINI.md A 3,352 tok These files are habinsong/k-fable-opus-claude-md's own configuration — they tell Codex, OpenCode, Claude Code and Gemini CLI how to work on this repository, so they are not mods to install elsewhere. Copy one as a starting point and replace the parts that are about this project.