Anthropic skipped UK pre-release tests for Mythos 5.1, the FT reports

Anthropic released its Mythos 5.1 AI model without providing the UK's AI Security Institute (AISI) a chance to test it beforehand, breaking from prior practice and raising UK concerns about US companies' protectionism. The UK government continues collaboration with Anthropic, while the EU's ENISA began testing Mythos 5 after lengthy negotiations but lacks access to Mythos 5.1.