Lab system cards and frameworks · System card · Anthropic

System Card: Claude Fable 5 & Claude Mythos 5

9 Jun 2026

This is version r1. The latest is r2.

Outline

The outline is kept for the latest version, r2. Open at p. 1

How to cite

A citation names the document, the version and the place.

anthropic:claude-fable-5-mythos-5-system-card/r1/p1

https://safetypage.noahairmet.com/d/anthropic/claude-fable-5-mythos-5-system-card/r1/p1

BibTeX

@misc{anthropic2026,
  title = {System Card: Claude Fable 5 & Claude Mythos 5},
  author = {{Anthropic}},
  year = {2026},
  url = {https://www-cdn.anthropic.com/57a52ea7d8f0e54e8a542e908266086df425cdf5/Claude%20Fable%205%20%26%20Claude%20Mythos%205%20System%20Card.pdf}
}

Versions

Version	Published	Read
r2 latest	11 Jun 2026	At source
r1	9 Jun 2026	At source

Licence

So you: Search it, cite it and check quotes here; read it at its source