"We're changing Fable 5's safeguards for frontier LLM development to make them visible," an Anthropic spokesperson said.

Anthropic is releasing Claude Fable 5, its first Mythos-class model available to the public. The model comes with guardrails that block responses in high-risk areas like…

Anthropic said it could not yet release the full Claude Mythos 5 model, so instead it created Fable 5 with baked in safeguards.

Company also changes data retention policy

Company also changes data retention policy

Fable 5 is the first Anthropic Mythos model released for public use.