Claude Fable 5.1 cuts prices by a quarter and promises zero retention for enterprises

On September 1, 2026, Anthropic launched Claude Fable 5.1 and Claude Mythos 5.1 — the same model split into two safeguard levels — with an estimated 25% price cut and ’Enterprise Frontier Safeguards’ storage that keeps data on the customer side. For a CISO or CTO, it is the first model where compliance becomes the headline argument rather than the benchmark.