“Europe is not at the table,” said Bart Groothuis, a Dutch liberal lawmaker and one of the letter’s signatories. “I think that we should shake the tree much, much harder.”
The Parliament’s internal market committee invited Anthropic to join a public hearing later this week, but the company said it was “unable to accept” the invitation to attend the hearing “at short notice,” according to a statement shared with POLITICO on Monday.
The lawmakers who signed the letter argued the European Union should reform its rules around the disclosure of cyber flaws and how they are fixed. They also urged the EU executive to prioritize the protection of “crown jewels,” like critical sector operators.
They pushed for the EU’s cyber agency ENISA to get access to Mythos and other models to scrutinize the risks.
Lawmakers are already eyeing an ongoing reform of the EU’s Cybersecurity Act to respond to the new threats, according to Groothuis, who previously served as a senior cybersecurity official in the Dutch government. The chief lawmaker on that bill, Czech Pirate Party member Markéta Gregorová, also signed Monday’s letter.
Commission spokesperson Thomas Regnier said in a statement the Commission has had “numerous” technical meetings with Anthropic since August 2025 to work with the firm on implementing the EU’s AI code of practice, which helps industry comply with requirements under the AI Act. The Commission has also held “several meetings” with the company to discuss Mythos specifically, he said.
“Once the enforcement powers of the AI Office start in August 2026, we will ensure to receive, if needed, model access,” Regnier said. The EU’s AI Office is the unit inside the Commission’s digital policy department that is tasked with policing AI risks, among other things.
This article was updated to include a comment from the European Commission.