Liam Byrne MP(@liambyrnemp):Britain cannot lead on AI security if our safety institute cannot test the world’s most advanced models before they are released. Reports that Anthropic did not give the @AISecurityInst pre-release access to Claude Mythos 5.1 raise serious questions about whether Britain has the access and leverage it needs. I’ve asked for urgent answers by Tuesday.

Liam Byrne MP

@liambyrnemp

🌹MP for Hodge Hill & Solihull North | Chair, House of Commons Business & Trade Committee | New book! Why Populists Are Winning:

Joined March 2009

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Liam Byrne MP@liambyrnemp

2026.09.09 15:48

Britain cannot lead on AI security if our safety institute cannot test the world’s most advanced models before they are released. Reports that Anthropic did not give the @AISecurityInst pre-release access to Claude Mythos 5.1 raise serious questions about whether Britain has the access and leverage it needs. I’ve asked for urgent answers by Tuesday.