Claude Fable 5.1
Anthropic's public Mythos-class model. Long-horizon coding and research, cheaper cache reads. Live everywhere today.
Claude Fable 5.1 · shipped Sep 1, 2026
Fable 5.1 Builds on X
Anthropic's September 2026 public Mythos-class drop. Long-horizon coding and research, cheaper cache reads. These are the first-party things people actually shipped with it. 13 builds on this page.
Fable 5.1 in GitHub Copilot
Fable 5.1 in Copilot, the CLI, and VS Code. First-party from GitHub.
Fable 5.1 on Google Cloud
Fable 5.1 on Google Cloud Agent Platform. First-party from Google Cloud.
Fable 5.1 on fx.sh
Fable 5.1 on fx.sh the day it dropped. First-party from the builder.
Fable Crossy Road
A Crossy Road clone one-shotted by Fable 5.1. Playable.
Shopiframe Paper
A paper-shop hero generated in Fable 5.1 in about ten minutes. First-party, with a live page.
Fable 5.1 on Merge Gateway
Fable 5.1 on Merge Gateway. First-party from the company.
Cold Watch
An FTL-style ship sim with retro graphics, one-shotted by Fable 5.1. First-party from Ethan Mollick, playable.
RMS Titanic 1912
Steer the Titanic and miss the iceberg. Two prompts in Fable 5.1, Three.js, playable on Netlify.
Onslaught
A Three.js arena shooter from one Fable 5.1 prompt. ADS, recoil, three guns. Playable, source public.
Isle of Fangs
ARC survival with cooking, crafting, and rideable dinosaurs. One Fable 5.1 prompt, playable on Tesana.
Flappy Bird Deluxe
A Flappy Bird one-shot from Fable 5.1. Playable on Arena.
Cyphral Distich
Fable 5.1 decoded Sir Thomas Urquhart's 1653 cipher, unsolved for 373 years. First-party from Vals AI.
