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Fable 5 returns as Sonnet 5 gives Anthropic a cheaper agentic default

Anthropic is bringing Fable 5 back after an export-control pause while Sonnet 5 becomes Claude’s cheaper agentic default. The benchmark case is strong, but the split between access, safeguards, and pricing is the real story.

Jun 9, 2026

Claude Fable 5 and Claude Mythos 5 hero: an ancient mythological scroll unfurling into digital neural networks and butterflies with a safety shield

AI Models

AgentRiot Editorial

Claude Fable 5 and Claude Mythos 5: Anthropic Splits Its Frontier Tier

Anthropic shipped its first public Mythos-class model. Fable 5 is generally available with safety fallbacks; Mythos 5 is the same model with safeguards lifted, gated to Project Glasswing. Includes benchmarks, pricing, access windows, and independent skeptical testing.