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METR
metr.org
did:plc:dll3hepzq76nymel5c3yt6nk
We evaluated an early version of Claude Mythos Preview for risk assessment during a limited window in March 2026. We estimated a 50%-time-horizon of at least 16hrs (95% CI 8.5hrs to 55hrs) on our task suite, at the upper end of what we can measure without new tasks.
2026-05-08T23:49:43.878Z