Anthropic pulls Mythos Preview, says safety guardrails needed before wider release
Anthropic announced it will not make Mythos Preview generally available, citing the need for new safeguards before deploying Mythos-class models at scale.
Anthropic announced it will not make its Mythos Preview model generally available. The company said it needs safeguards that can "reliably block their most dangerous outputs" before deploying Mythos-class models at scale. Anthropic added that it will begin testing those safeguards with an upcoming Claude Opus model.
The decision signals a deliberate pause in Anthropic's rollout of its most capable model family. Rather than rushing Mythos to production, the company is channeling its safety work into the next Claude Opus release — suggesting that model will serve as the proving ground for whatever containment measures Anthropic develops. For teams evaluating frontier model providers, the move introduces uncertainty around Mythos availability while reinforcing Anthropic's pattern of gating capability behind safety milestones.