Claude Fable 5.1 — The world’s most advanced model for coding and knowledge work.

Claude Fable 5.1 is an advanced AI model designed to enhance coding and knowledge work with improved performance and safeguards.

  • Fable 5.1 is generally available and priced approximately 25% less than its predecessor for typical workloads.
  • It features a new Enterprise Frontier Safeguards system for complete data privacy while preventing adversarial use.
  • The model has improved safeguards that reduce false positives in cybersecurity tasks by 60%.