Expired50% confidenceFactTime unknown
METR noted that the Claude Mythos Preview evaluation suite contains relatively few task samples in the over-16-hour range, and there is statistical uncertainty in measurements for that interval.
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
7/2/2026
First Seen
This claim has expired. It is kept for the record and no longer describes the current state.
Valid until: 9/30/2026(expired)
Sources
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