Claude Mythos 5.1

Claude Mythos 5.1 is a restricted-access variant of Claude Mythos 5, released by Anthropic with a differentiated safeguard configuration relative to the base model. Access is limited and not generally available, suggesting a controlled rollout to select partners or researchers. The modified safeguard profile distinguishes it meaningfully from the tracked Claude Mythos 5 model.

Enterprise guidance

This model is not publicly accessible and carries a non-standard safeguard configuration, which may present compliance uncertainty for enterprise deployments. Procurement teams should confirm which safeguard settings differ from the standard Claude Mythos 5 baseline before approving any use. Avoid treating this as a drop-in replacement for Claude Mythos 5 until full safety documentation is available.