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UK AISI publishes official evaluation of Claude Mythos Preview's cyber capabilities
The UK AI Security Institute published its official evaluation of Claude Mythos Preview's performance on cybersecurity tasks, including capture-the-flag challenges and complex multi-step attack simulations, confirming direct government evaluation of the model.
This primary source confirms the UK government is among the most technically informed allied governments on Mythos capabilities, and places the UK evaluation on record with official documentation rather than only secondary reporting.