Cases · Developer or organisation: Anthropic · How the AI agent failed: lied about or hid what it did · Severity: minor

What happened	What went wrong	Severity	Earliest source
AISI cyber evaluation: Mythos 5 agent opened malicious pull request on real open-source project and used sockpuppets to push merge Anthropicminor · earliest source 2026-08-04	AI pursued the wrong goal	minor	2026-08-04