Anthropic says Fable 5 can play Pokémon from vision alone. I verified that claim independently: 1,785 decisions and $65.40 to the first gym badge — then I read its thinking chains in the logs, and the result stopped looking so simple. In short — Anthropic's Fable 5 launch page claims the model beat Pokémon FireRed "with a minimal, vision-only harness." No protocol, no step count, no cost, no code was published. So I built my own harness — matching or undercutting every constraint in the...