Epsilon is the cheapest way to use Claude Fable 5.1, Claude Opus 5.5 and GPT-6. One key, one plan, zero subscriptions. It works in Claude Code: in the terminal, in VS Code and in the desktop app, or in our own EpsilonCLI. Paste the key and code like you always do, just for way less. Plans from 40 PLN a month, prepaid, no hidden fees, no token math. Log in with Discord and start in 5 minutes. Cheap Claude Code, no compromises.