System Card: Claude Mythos Preview

Anthropic's system card for Claude Mythos Preview. The companion cites it only in the habitat timeline (Fig. 4), among escapes and intrusions, mostly by autonomous agents, that led up to the July 2026 mesocosm breach.

Cited in

the companion paper (Companion Fig. 4)

Used for

Fig. 4 (habitat timeline)

Strand

AI safety, alignment & autonomy evaluations · System cards & lab safety reports

Cite

@techreport{anthropic2026mythos,
  title = {System Card: Claude Mythos Preview},
  author = {Anthropic},
  year = {2026},
  howpublished = {Anthropic},
  url = {https://www-cdn.anthropic.com/08ab9158070959f88f296514c21b7facce6f52bc.pdf},
}