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Cyphral Distich
Fable 5.1 decoded Sir Thomas Urquhart's 1653 cipher, unsolved for 373 years. First-party from Vals AI.
Related builds
Claude Fable 5.1
Anthropic's public Mythos-class model. Long-horizon coding and research, cheaper cache reads. Live everywhere today.
Fable 5.1 on Google Cloud
Fable 5.1 on Google Cloud Agent Platform. First-party from Google Cloud.
Claude Mythos 5.1
Same weights as Fable 5.1, fewer safeguards. Restricted to cyberdefenders and life scientists via trusted access.
Fable 5.1 in GitHub Copilot
Fable 5.1 in Copilot, the CLI, and VS Code. First-party from GitHub.
