Frontier AI models now win Slay the Spire at high rates on the SpireClimb benchmark

Epoch AI's SpireClimb benchmark finds frontier models beat Slay the Spire 1 at base difficulty (Ascension 0) at least 90% of the time, up from struggling six months earlier.

GPT-6 Astra reached a 17% win rate and GPT-6.1 Sol a 20% win rate at maximum difficulty (Ascension 20 Heart), far below top human players at 80% or more.

Models also won more often on Slay the Spire 2 at Ascension 10 than on the comparable original tier, though the authors note that game is easier.