Anthropic Releases Claude Fable 5.2 and Mythos 5.2 with Different Safety Profiles

Anthropic has launched two new model variants — Claude Fable 5.2 and Mythos 5.2 — which are built on the same underlying model but configured with different safety constraint profiles. This architecture reflects Anthropic's approach to operator-level customization, allowing deployment contexts with varying risk tolerances to access appropriately tuned model behavior. Fable 5.2 applies stricter safeguards suited for general-purpose or consumer-facing deployments, while Mythos 5.2 is designed for contexts requiring broader capability access under controlled conditions. For API developers, this expands the toolkit for tailoring Claude's behavior to specific use cases without fine-tuning. The release underscores Anthropic's continuing focus on making safety a configurable, deployable parameter rather than a one-size-fits-all constraint.