Expired50% confidenceFactTime unknown
In an early version of Anthropic's Claude Mythos Preview evaluated on a 228-task suite, the estimated duration corresponding to a 50% success rate exceeded 16 hours, more than double that of the previous best model.
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
7/2/2026
First Seen
Valid until: 9/30/2026(expired)
Sources
Related Claims
UnverifiedAnthropic published a paper stating that Claude Mythos Preview can work autonomously on complex tasks for at least 16 hours.75% similarUnverified以Mythos Preview为例，成功率在4小时任务节点开始显著下滑，且在15分钟内的短任务中某些类别模型也无法稳定完成71% similarUnverifiedIn Theo's test, asking about video pipeline optimizations without AgentMD completed in 1 minute 11 seconds, while with AgentMD it took 1 minute 29 seconds64% similarUnverifiedThis experiment (47 minutes and 51 seconds) ran longer than the previous experiment (15–20 minutes), but was more complex, with the output's theoretical depth significantly improved.62% similarUnverifiedThe speeds at which the two models completed the Dino Run game generation task were similar, both finishing within a few minutes61% similar
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