Anthropic Grants EU's ENISA Testing Access to Mythos 5 Months After Release, ENISA Still Locked Out of 5.1

Bloomberg reports Anthropic has finally granted the EU cybersecurity agency ENISA post-release testing access to Mythos 5 following talks that began in late May, but ENISA remains without access to the newer Mythos 5.1. The outcome contrasts with Anthropic's decision to skip UK AISI pre-release evaluation of Mythos 5.1, sharpening the debate over evaluator access across jurisdictions.