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Claude Fable 5.1
Anthropic's public Mythos-class model. Long-horizon coding and research, cheaper cache reads. Live everywhere today.
Related builds
Claude Fable 5.2
Anthropic's public model for the hardest technical work. Up to 30% faster than Fable 5.1, and cheaper. Live on the Claude apps, Claude Code, and the major clouds.
Claude Opus 5.5
Anthropic's first Claude 5.5 model. Fable-level on most work, about 40% cheaper than Opus 5. API id claude-opus-5-5.
Fable 5.1 on Google Cloud
Fable 5.1 on Google Cloud Agent Platform. First-party from Google Cloud.
Cyphral Distich
Fable 5.1 decoded Sir Thomas Urquhart's 1653 cipher, unsolved for 373 years. First-party from Vals AI.
