Moonshot AI's Kimi model, K2.5, has quickly ascended to the top of global rankings within 24 hours of its release on January 27. According to the LMarena ranking, Kimi K2.5 is positioned just behind closed-source models like Claude Opus4.5 and Genimi3 Pro, making it the highest-ranked open-source model. Additionally, in evaluations by Artificial Analysis, Kimi K2.5 secured the 5th spot overall, again leading among open-source models.