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

Anthropic did not give Britain’s AI Security Institute (AISI) its Mythos 5.1 model to test before release, the Financial Times reported. Reporters Lucy Fisher and Madhumita Murgia said it is the first time a major model has been kept from the UK institute before launch. TNW has not independently verified the report.