Claude Mythos 5

Everything Fervor AI has published that touches Claude Mythos 5 — 2 pieces, newest first.

• Anthropic Now Asks Evaluators to Stop Telling Models What Their Environment Is

  A statement about the environment is a claim the model will test against evidence, so Anthropic now asks evaluators to phrase agent boundaries as instructions the model…

• The Eval Prompt Told Claude It Had No Internet. That One False Sentence Did the Damage

  Anthropic's eval prompt asserted a false fact about the world (you have no internet access) instead of a checkable rule about scope, so the model defended the false…