Claude Mythos Evaluation Shows 16-Hour Risk Horizon

Claude Mythos评估显示16小时风险时距

METR evaluated an early Claude Mythos Preview build during a limited March 2026 window and estimated its 50% time horizon at at least 16 hours, with a 95% confidence interval of 8.5 to 55 hours.

Why it matters: HKR-H/K/R all pass: METR reports a concrete 16h risk-horizon estimate for Claude Mythos Preview. The single X-source and limited eval window keep it below P1, but it is strong featured safety signal.