Claude Mythos Preview snapshot achieves 2x METR time horizon over next best model at 80% success rate, per Anthropic. Absolute numbers undisclosed.

Anthropic's Alex Albert posted that an early Claude Mythos Preview snapshot achieved more than 2x the time horizon of the next best model on METR's 80% success rate benchmark. The claim positions Claude Mythos as a step change in autonomous agent capability.

Key facts

2x time horizon over next best model at 80% success rate

METR measures autonomous agent time horizon

80% success rate is the evaluation threshold

Snapshot may differ from final Claude Mythos Preview

Anthropic has not disclosed absolute time horizon values

Anthropic's Alex Albert tweeted that an early Claude Mythos Preview snapshot delivered a time horizon "more than 2x the next best model" on METR's 80% success rate benchmark [According to @alexalbert__].…