UK-based AI Security Institute will not be part of pre-release safety testing of American company’s newest model Mythos 5.1, a restricted version.

Anthropic withheld its latest AI model from UK testers. Anthropic having the best AI model by October 2026 at 73.5% YES.

UK-based AI Security Institute will not be part of pre-release safety testing of American company’s newest model Mythos 5.1, a restricted version.