System Card:
Claude
Mythos
Preview
April 7, 2026 anthropic.com
Changelog April 8, 2026 ● Corrected two model name typos. ● Removed a quote from Section 7.9 that was attributed to Claude Mythos Preview but
actually
came
from
Claude
Opus
4.6.
● Revised naming in Section 2.3.6 to disambiguate Anthropic’s internal fork of ECI ...
The release of Claude Mythos Preview marks a significant milestone in AI development, but Anthropic's decision to restrict its access underscores the growing tension between capability and control. The model's advanced cybersecurity skills—capable of both defending and exploiting vulnerabilities—highlight the dual-use dilemma inherent in frontier AI systems. While Anthropic frames this as a responsible scaling decision, the move also reflects broader industry trends where the most powerful model...
