Anthropic gave ENISA access to Mythos 5 three months after release, and still withholds 5.1.

Bloomberg reported September 10 that the EU cybersecurity agency is now testing Mythos 5 and GPT-6 Astra per a European Commission spokesperson, closing negotiations that began in late May. Access is limited to defensive use and does not extend to the current model. A roughly two-week US restriction on foreign access to Mythos 5 and Fable 5 worsened the delay. It mirrors the withholding from the UK AI Security Institute reported a day earlier, so the pattern is now two agencies.