On October 19, AI model evaluation platform Arena announced that DeepSeek-V4.1-Flash-1017 (Max) became the highest-ranked open-source model on the Code Arena: WebDev leaderboard with 1670 points, surpassing open-source models such as Kimi K3 (Max) and some closed-source models, trailing GPT-6 Sol (Max) by only 12 points. The model was released on October 17 with strong software engineering capabilities, and its API pricing is about one-tenth of Kimi K3's comprehensive cost.